Initial commit

Pods/SDWebImage/LICENSE

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+Copyright (c) 2009-2017 Olivier Poitrey rs@dailymotion.com
+ 
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+ 
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+ 
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+

Pods/SDWebImage/README.md

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+<p align="center">
+  <img src="SDWebImage_logo.png" title="SDWebImage logo" float=left>
+</p>
+
+
+[![Build Status](http://img.shields.io/travis/SDWebImage/SDWebImage/master.svg?style=flat)](https://travis-ci.org/SDWebImage/SDWebImage)
+[![Pod Version](http://img.shields.io/cocoapods/v/SDWebImage.svg?style=flat)](http://cocoadocs.org/docsets/SDWebImage/)
+[![Pod Platform](http://img.shields.io/cocoapods/p/SDWebImage.svg?style=flat)](http://cocoadocs.org/docsets/SDWebImage/)
+[![Pod License](http://img.shields.io/cocoapods/l/SDWebImage.svg?style=flat)](https://www.apache.org/licenses/LICENSE-2.0.html)
+[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/SDWebImage/SDWebImage)
+[![codecov](https://codecov.io/gh/SDWebImage/SDWebImage/branch/master/graph/badge.svg)](https://codecov.io/gh/SDWebImage/SDWebImage)
+
+This library provides an async image downloader with cache support. For convenience, we added categories for UI elements like `UIImageView`, `UIButton`, `MKAnnotationView`.
+
+## Features
+
+- [x] Categories for `UIImageView`, `UIButton`, `MKAnnotationView` adding web image and cache management
+- [x] An asynchronous image downloader
+- [x] An asynchronous memory + disk image caching with automatic cache expiration handling
+- [x] A background image decompression
+- [x] A guarantee that the same URL won't be downloaded several times
+- [x] A guarantee that bogus URLs won't be retried again and again
+- [x] A guarantee that main thread will never be blocked
+- [x] Performances!
+- [x] Use GCD and ARC
+
+## Supported Image Formats
+
+- Image formats supported by UIImage (JPEG, PNG, ...), including GIF
+- WebP format, including animated WebP (use the `WebP` subspec)
+
+## Requirements
+
+- iOS 7.0 or later
+- tvOS 9.0 or later
+- watchOS 2.0 or later
+- macOS 10.9 or later
+- Xcode 7.3 or later
+
+#### Backwards compatibility
+
+- For iOS 5 and 6, use [any 3.x version up to 3.7.6](https://github.com/SDWebImage/SDWebImage/tree/3.7.6)
+- For iOS < 5.0, please use the last [2.0 version](https://github.com/SDWebImage/SDWebImage/tree/2.0-compat).
+
+## Getting Started
+
+- Read this Readme doc
+- Read the [How to use section](https://github.com/SDWebImage/SDWebImage#how-to-use)
+- Read the [Documentation @ CocoaDocs](http://cocoadocs.org/docsets/SDWebImage/)
+- Try the example by downloading the project from Github or even easier using CocoaPods try `pod try SDWebImage`
+- Read the [Installation Guide](https://github.com/SDWebImage/SDWebImage/wiki/Installation-Guide)
+- Read the [SDWebImage 4.0 Migration Guide](Docs/SDWebImage-4.0-Migration-guide.md) to get an idea of the changes from 3.x to 4.x
+- Read the [Common Problems](https://github.com/SDWebImage/SDWebImage/wiki/Common-Problems) to find the solution for common problems 
+- Go to the [Wiki Page](https://github.com/SDWebImage/SDWebImage/wiki) for more information such as [Advanced Usage](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage)
+
+## Who Uses It
+- Find out [who uses SDWebImage](https://github.com/SDWebImage/SDWebImage/wiki/Who-Uses-SDWebImage) and add your app to the list.
+
+## Communication
+
+- If you **need help**, use [Stack Overflow](http://stackoverflow.com/questions/tagged/sdwebimage). (Tag 'sdwebimage')
+- If you'd like to **ask a general question**, use [Stack Overflow](http://stackoverflow.com/questions/tagged/sdwebimage).
+- If you **found a bug**, open an issue.
+- If you **have a feature request**, open an issue.
+- If you **want to contribute**, submit a pull request.
+
+## How To Use
+
+* Objective-C
+
+```objective-c
+#import <SDWebImage/UIImageView+WebCache.h>
+...
+[imageView sd_setImageWithURL:[NSURL URLWithString:@"http://www.domain.com/path/to/image.jpg"]
+             placeholderImage:[UIImage imageNamed:@"placeholder.png"]];
+```
+
+* Swift
+
+```swift
+import SDWebImage
+
+imageView.sd_setImage(with: URL(string: "http://www.domain.com/path/to/image.jpg"), placeholderImage: UIImage(named: "placeholder.png"))
+```
+
+- For details about how to use the library and clear examples, see [The detailed How to use](Docs/HowToUse.md)
+
+## Animated Images (GIF) support
+
+- Starting with the 4.0 version, we rely on [FLAnimatedImage](https://github.com/Flipboard/FLAnimatedImage) to take care of our animated images. 
+- If you use cocoapods, add `pod 'SDWebImage/GIF'` to your podfile.
+- To use it, simply make sure you use `FLAnimatedImageView` instead of `UIImageView`.
+- **Note**: there is a backwards compatible feature, so if you are still trying to load a GIF into a `UIImageView`, it will only show the 1st frame as a static image by default. However, you can enable the full GIF support by using the built-in GIF coder. See [GIF coder](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#gif-coder)
+- **Important**: FLAnimatedImage only works on the iOS platform. For macOS, use `NSImageView` with `animates` set to `YES` to show the entire animated images and `NO` to only show the 1st frame. For all the other platforms (tvOS, watchOS) we will fallback to the backwards compatibility feature described above 
+
+## Installation
+
+There are three ways to use SDWebImage in your project:
+- using CocoaPods
+- using Carthage
+- by cloning the project into your repository
+
+### Installation with CocoaPods
+
+[CocoaPods](http://cocoapods.org/) is a dependency manager for Objective-C, which automates and simplifies the process of using 3rd-party libraries in your projects. See the [Get Started](http://cocoapods.org/#get_started) section for more details.
+
+#### Podfile
+```
+platform :ios, '7.0'
+pod 'SDWebImage', '~> 4.0'
+```
+
+If you are using Swift, be sure to add `use_frameworks!` and set your target to iOS 8+:
+```
+platform :ios, '8.0'
+use_frameworks!
+```
+
+#### Subspecs
+
+There are 4 subspecs available now: `Core`, `MapKit`, `GIF` and `WebP` (this means you can install only some of the SDWebImage modules. By default, you get just `Core`, so if you need `WebP`, you need to specify it). 
+
+Podfile example:
+```
+pod 'SDWebImage/WebP'
+```
+
+### Installation with Carthage (iOS 8+)
+
+[Carthage](https://github.com/Carthage/Carthage) is a lightweight dependency manager for Swift and Objective-C. It leverages CocoaTouch modules and is less invasive than CocoaPods.
+
+To install with carthage, follow the instruction on [Carthage](https://github.com/Carthage/Carthage)
+
+#### Cartfile
+```
+github "SDWebImage/SDWebImage"
+```
+
+### Installation by cloning the repository
+- see [Manual install](Docs/ManualInstallation.md)
+
+### Import headers in your source files
+
+In the source files where you need to use the library, import the header file:
+
+```objective-c
+#import <SDWebImage/UIImageView+WebCache.h>
+```
+
+### Build Project
+
+At this point your workspace should build without error. If you are having problem, post to the Issue and the
+community can help you solve it.
+
+## Author
+- [Olivier Poitrey](https://github.com/rs)
+
+## Collaborators
+- [Konstantinos K.](https://github.com/mythodeia)
+- [Bogdan Poplauschi](https://github.com/bpoplauschi)
+- [Chester Liu](https://github.com/skyline75489)
+- [DreamPiggy](https://github.com/dreampiggy)
+- [Wu Zhong](https://github.com/zhongwuzw)
+
+## Licenses
+
+All source code is licensed under the [MIT License](https://raw.github.com/SDWebImage/SDWebImage/master/LICENSE).
+
+## Architecture
+
+<p align="center">
+    <img src="Docs/SDWebImageClassDiagram.png" title="SDWebImage class diagram">
+</p>
+
+<p align="center">
+    <img src="Docs/SDWebImageSequenceDiagram.png" title="SDWebImage sequence diagram">
+</p>

Pods/SDWebImage/SDWebImage/NSButton+WebCache.h

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+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+#if SD_MAC
+
+#import "SDWebImageManager.h"
+
+@interface NSButton (WebCache)
+
+#pragma mark - Image
+
+/**
+ * Get the current image URL.
+ */
+- (nullable NSURL *)sd_currentImageURL;
+
+/**
+ * Set the button `image` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url The url for the image.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `image` with an `url` and a placeholder.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @see sd_setImageWithURL:placeholderImage:options:
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `image` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the button `image` with an `url`, placeholder.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                 completed:(nullable SDExternalCompletionBlock)completedBlock NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the button `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+#pragma mark - Alternate Image
+
+/**
+ * Get the current alternateImage URL.
+ */
+- (nullable NSURL *)sd_currentAlternateImageURL;
+
+/**
+ * Set the button `alternateImage` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url The url for the alternateImage.
+ */
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `alternateImage` with an `url` and a placeholder.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the alternateImage.
+ * @param placeholder The alternateImage to be set initially, until the alternateImage request finishes.
+ * @see sd_setAlternateImageWithURL:placeholderImage:options:
+ */
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url
+                   placeholderImage:(nullable UIImage *)placeholder NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `alternateImage` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the alternateImage.
+ * @param placeholder The alternateImage to be set initially, until the alternateImage request finishes.
+ * @param options     The options to use when downloading the alternateImage. @see SDWebImageOptions for the possible values.
+ */
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url
+                   placeholderImage:(nullable UIImage *)placeholder
+                            options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `alternateImage` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the alternateImage.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the alternateImage parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the alternateImage was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original alternateImage url.
+ */
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url
+                          completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the button `alternateImage` with an `url`, placeholder.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the alternateImage.
+ * @param placeholder    The alternateImage to be set initially, until the alternateImage request finishes.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the alternateImage parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the alternateImage was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original alternateImage url.
+ */
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url
+                   placeholderImage:(nullable UIImage *)placeholder
+                          completed:(nullable SDExternalCompletionBlock)completedBlock NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the button `alternateImage` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the alternateImage.
+ * @param placeholder    The alternateImage to be set initially, until the alternateImage request finishes.
+ * @param options        The options to use when downloading the alternateImage. @see SDWebImageOptions for the possible values.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the alternateImage parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the alternateImage was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original alternateImage url.
+ */
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url
+                   placeholderImage:(nullable UIImage *)placeholder
+                            options:(SDWebImageOptions)options
+                          completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the button `alternateImage` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the alternateImage.
+ * @param placeholder    The alternateImage to be set initially, until the alternateImage request finishes.
+ * @param options        The options to use when downloading the alternateImage. @see SDWebImageOptions for the possible values.
+ * @param progressBlock  A block called while alternateImage is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the alternateImage parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the alternateImage was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original alternateImage url.
+ */
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url
+                   placeholderImage:(nullable UIImage *)placeholder
+                            options:(SDWebImageOptions)options
+                           progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                          completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+#pragma mark - Cancel
+
+/**
+ * Cancel the current image download
+ */
+- (void)sd_cancelCurrentImageLoad;
+
+/**
+ * Cancel the current alternateImage download
+ */
+- (void)sd_cancelCurrentAlternateImageLoad;
+
+@end
+
+#endif

Pods/SDWebImage/SDWebImage/NSButton+WebCache.m

@@ -0,0 +1,147 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "NSButton+WebCache.h"
+
+#if SD_MAC
+
+#import "objc/runtime.h"
+#import "UIView+WebCacheOperation.h"
+#import "UIView+WebCache.h"
+
+static inline NSString * imageOperationKey() {
+    return @"NSButtonImageOperation";
+}
+
+static inline NSString * alternateImageOperationKey() {
+    return @"NSButtonAlternateImageOperation";
+}
+
+@implementation NSButton (WebCache)
+
+#pragma mark - Image
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url {
+    [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock {
+    self.sd_currentImageURL = url;
+    
+    __weak typeof(self)weakSelf = self;
+    [self sd_internalSetImageWithURL:url
+                    placeholderImage:placeholder
+                             options:options
+                        operationKey:imageOperationKey()
+                       setImageBlock:^(NSImage * _Nullable image, NSData * _Nullable imageData) {
+                           weakSelf.image = image;
+                       }
+                            progress:progressBlock
+                           completed:completedBlock];
+}
+
+#pragma mark - Alternate Image
+
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url {
+    [self sd_setAlternateImageWithURL:url placeholderImage:nil options:0 progress:nil completed:nil];
+}
+
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder {
+    [self sd_setAlternateImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:nil];
+}
+
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
+    [self sd_setAlternateImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:nil];
+}
+
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setAlternateImageWithURL:url placeholderImage:nil options:0 progress:nil completed:completedBlock];
+}
+
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setAlternateImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:completedBlock];
+}
+
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setAlternateImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:completedBlock];
+}
+
+- (void)sd_setAlternateImageWithURL:(nullable NSURL *)url
+                   placeholderImage:(nullable UIImage *)placeholder
+                            options:(SDWebImageOptions)options
+                           progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                          completed:(nullable SDExternalCompletionBlock)completedBlock {
+    self.sd_currentAlternateImageURL = url;
+    
+    __weak typeof(self)weakSelf = self;
+    [self sd_internalSetImageWithURL:url
+                    placeholderImage:placeholder
+                             options:options
+                        operationKey:alternateImageOperationKey()
+                       setImageBlock:^(NSImage * _Nullable image, NSData * _Nullable imageData) {
+                           weakSelf.alternateImage = image;
+                       }
+                            progress:progressBlock
+                           completed:completedBlock];
+}
+
+#pragma mark - Cancel
+
+- (void)sd_cancelCurrentImageLoad {
+    [self sd_cancelImageLoadOperationWithKey:imageOperationKey()];
+}
+
+- (void)sd_cancelCurrentAlternateImageLoad {
+    [self sd_cancelImageLoadOperationWithKey:alternateImageOperationKey()];
+}
+
+#pragma mar - Private
+
+- (NSURL *)sd_currentImageURL {
+    return objc_getAssociatedObject(self, @selector(sd_currentImageURL));
+}
+
+- (void)setSd_currentImageURL:(NSURL *)sd_currentImageURL {
+    objc_setAssociatedObject(self, @selector(sd_currentImageURL), sd_currentImageURL, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
+- (NSURL *)sd_currentAlternateImageURL {
+    return objc_getAssociatedObject(self, @selector(sd_currentAlternateImageURL));
+}
+
+- (void)setSd_currentAlternateImageURL:(NSURL *)sd_currentAlternateImageURL {
+    objc_setAssociatedObject(self, @selector(sd_currentAlternateImageURL), sd_currentAlternateImageURL, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
+@end
+
+#endif

Pods/SDWebImage/SDWebImage/NSData+ImageContentType.h

@@ -0,0 +1,51 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Fabrice Aneche
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+typedef NS_ENUM(NSInteger, SDImageFormat) {
+    SDImageFormatUndefined = -1,
+    SDImageFormatJPEG = 0,
+    SDImageFormatPNG,
+    SDImageFormatGIF,
+    SDImageFormatTIFF,
+    SDImageFormatWebP,
+    SDImageFormatHEIC,
+    SDImageFormatHEIF
+};
+
+@interface NSData (ImageContentType)
+
+/**
+ *  Return image format
+ *
+ *  @param data the input image data
+ *
+ *  @return the image format as `SDImageFormat` (enum)
+ */
++ (SDImageFormat)sd_imageFormatForImageData:(nullable NSData *)data;
+
+/**
+ *  Convert SDImageFormat to UTType
+ *
+ *  @param format Format as SDImageFormat
+ *  @return The UTType as CFStringRef
+ */
++ (nonnull CFStringRef)sd_UTTypeFromSDImageFormat:(SDImageFormat)format;
+
+/**
+ *  Convert UTTyppe to SDImageFormat
+ *
+ *  @param uttype The UTType as CFStringRef
+ *  @return The Format as SDImageFormat
+ */
++ (SDImageFormat)sd_imageFormatFromUTType:(nonnull CFStringRef)uttype;
+
+@end

Pods/SDWebImage/SDWebImage/NSData+ImageContentType.m

@@ -0,0 +1,130 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Fabrice Aneche
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "NSData+ImageContentType.h"
+#if SD_MAC
+#import <CoreServices/CoreServices.h>
+#else
+#import <MobileCoreServices/MobileCoreServices.h>
+#endif
+
+// Currently Image/IO does not support WebP
+#define kSDUTTypeWebP ((__bridge CFStringRef)@"public.webp")
+// AVFileTypeHEIC/AVFileTypeHEIF is defined in AVFoundation via iOS 11, we use this without import AVFoundation
+#define kSDUTTypeHEIC ((__bridge CFStringRef)@"public.heic")
+#define kSDUTTypeHEIF ((__bridge CFStringRef)@"public.heif")
+
+@implementation NSData (ImageContentType)
+
++ (SDImageFormat)sd_imageFormatForImageData:(nullable NSData *)data {
+    if (!data) {
+        return SDImageFormatUndefined;
+    }
+    
+    // File signatures table: http://www.garykessler.net/library/file_sigs.html
+    uint8_t c;
+    [data getBytes:&c length:1];
+    switch (c) {
+        case 0xFF:
+            return SDImageFormatJPEG;
+        case 0x89:
+            return SDImageFormatPNG;
+        case 0x47:
+            return SDImageFormatGIF;
+        case 0x49:
+        case 0x4D:
+            return SDImageFormatTIFF;
+        case 0x52: {
+            if (data.length >= 12) {
+                //RIFF....WEBP
+                NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding];
+                if ([testString hasPrefix:@"RIFF"] && [testString hasSuffix:@"WEBP"]) {
+                    return SDImageFormatWebP;
+                }
+            }
+            break;
+        }
+        case 0x00: {
+            if (data.length >= 12) {
+                //....ftypheic ....ftypheix ....ftyphevc ....ftyphevx
+                NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(4, 8)] encoding:NSASCIIStringEncoding];
+                if ([testString isEqualToString:@"ftypheic"]
+                    || [testString isEqualToString:@"ftypheix"]
+                    || [testString isEqualToString:@"ftyphevc"]
+                    || [testString isEqualToString:@"ftyphevx"]) {
+                    return SDImageFormatHEIC;
+                }
+                if ([testString isEqualToString:@"ftypmif1"] || [testString isEqualToString:@"ftypmsf1"]) {
+                    return SDImageFormatHEIF;
+                }
+            }
+            break;
+        }
+    }
+    return SDImageFormatUndefined;
+}
+
++ (nonnull CFStringRef)sd_UTTypeFromSDImageFormat:(SDImageFormat)format {
+    CFStringRef UTType;
+    switch (format) {
+        case SDImageFormatJPEG:
+            UTType = kUTTypeJPEG;
+            break;
+        case SDImageFormatPNG:
+            UTType = kUTTypePNG;
+            break;
+        case SDImageFormatGIF:
+            UTType = kUTTypeGIF;
+            break;
+        case SDImageFormatTIFF:
+            UTType = kUTTypeTIFF;
+            break;
+        case SDImageFormatWebP:
+            UTType = kSDUTTypeWebP;
+            break;
+        case SDImageFormatHEIC:
+            UTType = kSDUTTypeHEIC;
+            break;
+        case SDImageFormatHEIF:
+            UTType = kSDUTTypeHEIF;
+            break;
+        default:
+            // default is kUTTypePNG
+            UTType = kUTTypePNG;
+            break;
+    }
+    return UTType;
+}
+
++ (SDImageFormat)sd_imageFormatFromUTType:(CFStringRef)uttype {
+    if (!uttype) {
+        return SDImageFormatUndefined;
+    }
+    SDImageFormat imageFormat;
+    if (CFStringCompare(uttype, kUTTypeJPEG, 0) == kCFCompareEqualTo) {
+        imageFormat = SDImageFormatJPEG;
+    } else if (CFStringCompare(uttype, kUTTypePNG, 0) == kCFCompareEqualTo) {
+        imageFormat = SDImageFormatPNG;
+    } else if (CFStringCompare(uttype, kUTTypeGIF, 0) == kCFCompareEqualTo) {
+        imageFormat = SDImageFormatGIF;
+    } else if (CFStringCompare(uttype, kUTTypeTIFF, 0) == kCFCompareEqualTo) {
+        imageFormat = SDImageFormatTIFF;
+    } else if (CFStringCompare(uttype, kSDUTTypeWebP, 0) == kCFCompareEqualTo) {
+        imageFormat = SDImageFormatWebP;
+    } else if (CFStringCompare(uttype, kSDUTTypeHEIC, 0) == kCFCompareEqualTo) {
+        imageFormat = SDImageFormatHEIC;
+    } else if (CFStringCompare(uttype, kSDUTTypeHEIF, 0) == kCFCompareEqualTo) {
+        imageFormat = SDImageFormatHEIF;
+    } else {
+        imageFormat = SDImageFormatUndefined;
+    }
+    return imageFormat;
+}
+
+@end

Pods/SDWebImage/SDWebImage/NSImage+WebCache.h

@@ -0,0 +1,23 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+#if SD_MAC
+
+#import <Cocoa/Cocoa.h>
+
+@interface NSImage (WebCache)
+
+- (CGImageRef)CGImage;
+- (NSArray<NSImage *> *)images;
+- (BOOL)isGIF;
+
+@end
+
+#endif

Pods/SDWebImage/SDWebImage/NSImage+WebCache.m

@@ -0,0 +1,41 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "NSImage+WebCache.h"
+
+#if SD_MAC
+
+@implementation NSImage (WebCache)
+
+- (CGImageRef)CGImage {
+    NSRect imageRect = NSMakeRect(0, 0, self.size.width, self.size.height);
+    CGImageRef cgImage = [self CGImageForProposedRect:&imageRect context:NULL hints:nil];
+    return cgImage;
+}
+
+- (NSArray<NSImage *> *)images {
+    return nil;
+}
+
+- (BOOL)isGIF {
+    BOOL isGIF = NO;
+    for (NSImageRep *rep in self.representations) {
+        if ([rep isKindOfClass:[NSBitmapImageRep class]]) {
+            NSBitmapImageRep *bitmapRep = (NSBitmapImageRep *)rep;
+            NSUInteger frameCount = [[bitmapRep valueForProperty:NSImageFrameCount] unsignedIntegerValue];
+            isGIF = frameCount > 1 ? YES : NO;
+            break;
+        }
+    }
+    return isGIF;
+}
+
+@end
+
+#endif
+

Pods/SDWebImage/SDWebImage/SDAnimatedImageRep.h

@@ -0,0 +1,20 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+#if SD_MAC
+
+// A subclass of `NSBitmapImageRep` to fix that GIF loop count issue because `NSBitmapImageRep` will reset `NSImageCurrentFrameDuration` by using `kCGImagePropertyGIFDelayTime` but not `kCGImagePropertyGIFUnclampedDelayTime`.
+// Built in GIF coder use this instead of `NSBitmapImageRep` for better GIF rendering. If you do not want this, only enable `SDWebImageImageIOCoder`, which just call `NSImage` API and actually use `NSBitmapImageRep` for GIF image.
+
+@interface SDAnimatedImageRep : NSBitmapImageRep
+
+@end
+
+#endif

Pods/SDWebImage/SDWebImage/SDAnimatedImageRep.m

@@ -0,0 +1,66 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDAnimatedImageRep.h"
+
+#if SD_MAC
+
+#import "SDWebImageGIFCoder.h"
+
+@interface SDWebImageGIFCoder ()
+
+- (float)sd_frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source;
+
+@end
+
+@interface SDAnimatedImageRep ()
+
+@property (nonatomic, assign, readonly, nullable) CGImageSourceRef imageSource;
+
+@end
+
+@implementation SDAnimatedImageRep
+
+// `NSBitmapImageRep` will use `kCGImagePropertyGIFDelayTime` whenever you call `setProperty:withValue:` with `NSImageCurrentFrame` to change the current frame. We override it and use the actual `kCGImagePropertyGIFUnclampedDelayTime` if need.
+- (void)setProperty:(NSBitmapImageRepPropertyKey)property withValue:(id)value {
+    [super setProperty:property withValue:value];
+    if ([property isEqualToString:NSImageCurrentFrame]) {
+        // Access the image source
+        CGImageSourceRef imageSource = self.imageSource;
+        if (!imageSource) {
+            return;
+        }
+        // Check format type
+        CFStringRef type = CGImageSourceGetType(imageSource);
+        if (!type) {
+            return;
+        }
+        NSUInteger index = [value unsignedIntegerValue];
+        float frameDuration = 0;
+        // Through we currently process GIF only, in the 5.x we support APNG so we keep the extensibility
+        if (CFStringCompare(type, kUTTypeGIF, 0) == kCFCompareEqualTo) {
+            frameDuration = [[SDWebImageGIFCoder sharedCoder] sd_frameDurationAtIndex:index source:imageSource];
+        }
+        if (!frameDuration) {
+            return;
+        }
+        // Reset super frame duration with the actual frame duration
+        [super setProperty:NSImageCurrentFrameDuration withValue:@(frameDuration)];
+    }
+}
+
+- (CGImageSourceRef)imageSource {
+    if (_tiffData) {
+        return (__bridge CGImageSourceRef)(_tiffData);
+    }
+    return NULL;
+}
+
+@end
+
+#endif

Pods/SDWebImage/SDWebImage/SDImageCache.h

@@ -0,0 +1,310 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+#import "SDImageCacheConfig.h"
+
+typedef NS_ENUM(NSInteger, SDImageCacheType) {
+    /**
+     * The image wasn't available the SDWebImage caches, but was downloaded from the web.
+     */
+    SDImageCacheTypeNone,
+    /**
+     * The image was obtained from the disk cache.
+     */
+    SDImageCacheTypeDisk,
+    /**
+     * The image was obtained from the memory cache.
+     */
+    SDImageCacheTypeMemory
+};
+
+typedef NS_OPTIONS(NSUInteger, SDImageCacheOptions) {
+    /**
+     * By default, we do not query disk data when the image is cached in memory. This mask can force to query disk data at the same time.
+     */
+    SDImageCacheQueryDataWhenInMemory = 1 << 0,
+    /**
+     * By default, we query the memory cache synchronously, disk cache asynchronously. This mask can force to query disk cache synchronously.
+     */
+    SDImageCacheQueryDiskSync = 1 << 1,
+    /**
+     * By default, images are decoded respecting their original size. On iOS, this flag will scale down the
+     * images to a size compatible with the constrained memory of devices.
+     */
+    SDImageCacheScaleDownLargeImages = 1 << 2
+};
+
+typedef void(^SDCacheQueryCompletedBlock)(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType);
+
+typedef void(^SDWebImageCheckCacheCompletionBlock)(BOOL isInCache);
+
+typedef void(^SDWebImageCalculateSizeBlock)(NSUInteger fileCount, NSUInteger totalSize);
+
+
+/**
+ * SDImageCache maintains a memory cache and an optional disk cache. Disk cache write operations are performed
+ * asynchronous so it doesn’t add unnecessary latency to the UI.
+ */
+@interface SDImageCache : NSObject
+
+#pragma mark - Properties
+
+/**
+ *  Cache Config object - storing all kind of settings
+ */
+@property (nonatomic, nonnull, readonly) SDImageCacheConfig *config;
+
+/**
+ * The maximum "total cost" of the in-memory image cache. The cost function is the number of pixels held in memory.
+ */
+@property (assign, nonatomic) NSUInteger maxMemoryCost;
+
+/**
+ * The maximum number of objects the cache should hold.
+ */
+@property (assign, nonatomic) NSUInteger maxMemoryCountLimit;
+
+#pragma mark - Singleton and initialization
+
+/**
+ * Returns global shared cache instance
+ *
+ * @return SDImageCache global instance
+ */
++ (nonnull instancetype)sharedImageCache;
+
+/**
+ * Init a new cache store with a specific namespace
+ *
+ * @param ns The namespace to use for this cache store
+ */
+- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns;
+
+/**
+ * Init a new cache store with a specific namespace and directory
+ *
+ * @param ns        The namespace to use for this cache store
+ * @param directory Directory to cache disk images in
+ */
+- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns
+                       diskCacheDirectory:(nonnull NSString *)directory NS_DESIGNATED_INITIALIZER;
+
+#pragma mark - Cache paths
+
+- (nullable NSString *)makeDiskCachePath:(nonnull NSString*)fullNamespace;
+
+/**
+ * Add a read-only cache path to search for images pre-cached by SDImageCache
+ * Useful if you want to bundle pre-loaded images with your app
+ *
+ * @param path The path to use for this read-only cache path
+ */
+- (void)addReadOnlyCachePath:(nonnull NSString *)path;
+
+#pragma mark - Store Ops
+
+/**
+ * Asynchronously store an image into memory and disk cache at the given key.
+ *
+ * @param image           The image to store
+ * @param key             The unique image cache key, usually it's image absolute URL
+ * @param completionBlock A block executed after the operation is finished
+ */
+- (void)storeImage:(nullable UIImage *)image
+            forKey:(nullable NSString *)key
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock;
+
+/**
+ * Asynchronously store an image into memory and disk cache at the given key.
+ *
+ * @param image           The image to store
+ * @param key             The unique image cache key, usually it's image absolute URL
+ * @param toDisk          Store the image to disk cache if YES
+ * @param completionBlock A block executed after the operation is finished
+ */
+- (void)storeImage:(nullable UIImage *)image
+            forKey:(nullable NSString *)key
+            toDisk:(BOOL)toDisk
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock;
+
+/**
+ * Asynchronously store an image into memory and disk cache at the given key.
+ *
+ * @param image           The image to store
+ * @param imageData       The image data as returned by the server, this representation will be used for disk storage
+ *                        instead of converting the given image object into a storable/compressed image format in order
+ *                        to save quality and CPU
+ * @param key             The unique image cache key, usually it's image absolute URL
+ * @param toDisk          Store the image to disk cache if YES
+ * @param completionBlock A block executed after the operation is finished
+ */
+- (void)storeImage:(nullable UIImage *)image
+         imageData:(nullable NSData *)imageData
+            forKey:(nullable NSString *)key
+            toDisk:(BOOL)toDisk
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock;
+
+/**
+ * Synchronously store image NSData into disk cache at the given key.
+ *
+ *
+ * @param imageData  The image data to store
+ * @param key        The unique image cache key, usually it's image absolute URL
+ */
+- (void)storeImageDataToDisk:(nullable NSData *)imageData forKey:(nullable NSString *)key;
+
+#pragma mark - Query and Retrieve Ops
+
+/**
+ *  Async check if image exists in disk cache already (does not load the image)
+ *
+ *  @param key             the key describing the url
+ *  @param completionBlock the block to be executed when the check is done.
+ *  @note the completion block will be always executed on the main queue
+ */
+- (void)diskImageExistsWithKey:(nullable NSString *)key completion:(nullable SDWebImageCheckCacheCompletionBlock)completionBlock;
+
+/**
+ *  Sync check if image data exists in disk cache already (does not load the image)
+ *
+ *  @param key             the key describing the url
+ */
+- (BOOL)diskImageDataExistsWithKey:(nullable NSString *)key;
+
+/**
+ *  Query the image data for the given key synchronously.
+ *
+ *  @param key The unique key used to store the wanted image
+ *  @return The image data for the given key, or nil if not found.
+ */
+- (nullable NSData *)diskImageDataForKey:(nullable NSString *)key;
+
+/**
+ * Operation that queries the cache asynchronously and call the completion when done.
+ *
+ * @param key       The unique key used to store the wanted image
+ * @param doneBlock The completion block. Will not get called if the operation is cancelled
+ *
+ * @return a NSOperation instance containing the cache op
+ */
+- (nullable NSOperation *)queryCacheOperationForKey:(nullable NSString *)key done:(nullable SDCacheQueryCompletedBlock)doneBlock;
+
+/**
+ * Operation that queries the cache asynchronously and call the completion when done.
+ *
+ * @param key       The unique key used to store the wanted image
+ * @param options   A mask to specify options to use for this cache query
+ * @param doneBlock The completion block. Will not get called if the operation is cancelled
+ *
+ * @return a NSOperation instance containing the cache op
+ */
+- (nullable NSOperation *)queryCacheOperationForKey:(nullable NSString *)key options:(SDImageCacheOptions)options done:(nullable SDCacheQueryCompletedBlock)doneBlock;
+
+/**
+ * Query the memory cache synchronously.
+ *
+ * @param key The unique key used to store the image
+ * @return The image for the given key, or nil if not found.
+ */
+- (nullable UIImage *)imageFromMemoryCacheForKey:(nullable NSString *)key;
+
+/**
+ * Query the disk cache synchronously.
+ *
+ * @param key The unique key used to store the image
+ * @return The image for the given key, or nil if not found.
+ */
+- (nullable UIImage *)imageFromDiskCacheForKey:(nullable NSString *)key;
+
+/**
+ * Query the cache (memory and or disk) synchronously after checking the memory cache.
+ *
+ * @param key The unique key used to store the image
+ * @return The image for the given key, or nil if not found.
+ */
+- (nullable UIImage *)imageFromCacheForKey:(nullable NSString *)key;
+
+#pragma mark - Remove Ops
+
+/**
+ * Remove the image from memory and disk cache asynchronously
+ *
+ * @param key             The unique image cache key
+ * @param completion      A block that should be executed after the image has been removed (optional)
+ */
+- (void)removeImageForKey:(nullable NSString *)key withCompletion:(nullable SDWebImageNoParamsBlock)completion;
+
+/**
+ * Remove the image from memory and optionally disk cache asynchronously
+ *
+ * @param key             The unique image cache key
+ * @param fromDisk        Also remove cache entry from disk if YES
+ * @param completion      A block that should be executed after the image has been removed (optional)
+ */
+- (void)removeImageForKey:(nullable NSString *)key fromDisk:(BOOL)fromDisk withCompletion:(nullable SDWebImageNoParamsBlock)completion;
+
+#pragma mark - Cache clean Ops
+
+/**
+ * Clear all memory cached images
+ */
+- (void)clearMemory;
+
+/**
+ * Async clear all disk cached images. Non-blocking method - returns immediately.
+ * @param completion    A block that should be executed after cache expiration completes (optional)
+ */
+- (void)clearDiskOnCompletion:(nullable SDWebImageNoParamsBlock)completion;
+
+/**
+ * Async remove all expired cached image from disk. Non-blocking method - returns immediately.
+ * @param completionBlock A block that should be executed after cache expiration completes (optional)
+ */
+- (void)deleteOldFilesWithCompletionBlock:(nullable SDWebImageNoParamsBlock)completionBlock;
+
+#pragma mark - Cache Info
+
+/**
+ * Get the size used by the disk cache
+ */
+- (NSUInteger)getSize;
+
+/**
+ * Get the number of images in the disk cache
+ */
+- (NSUInteger)getDiskCount;
+
+/**
+ * Asynchronously calculate the disk cache's size.
+ */
+- (void)calculateSizeWithCompletionBlock:(nullable SDWebImageCalculateSizeBlock)completionBlock;
+
+#pragma mark - Cache Paths
+
+/**
+ *  Get the cache path for a certain key (needs the cache path root folder)
+ *
+ *  @param key  the key (can be obtained from url using cacheKeyForURL)
+ *  @param path the cache path root folder
+ *
+ *  @return the cache path
+ */
+- (nullable NSString *)cachePathForKey:(nullable NSString *)key inPath:(nonnull NSString *)path;
+
+/**
+ *  Get the default cache path for a certain key
+ *
+ *  @param key the key (can be obtained from url using cacheKeyForURL)
+ *
+ *  @return the default cache path
+ */
+- (nullable NSString *)defaultCachePathForKey:(nullable NSString *)key;
+
+@end

Pods/SDWebImage/SDWebImage/SDImageCache.m

@@ -0,0 +1,818 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageCache.h"
+#import <CommonCrypto/CommonDigest.h>
+#import "NSImage+WebCache.h"
+#import "SDWebImageCodersManager.h"
+
+#define SD_MAX_FILE_EXTENSION_LENGTH (NAME_MAX - CC_MD5_DIGEST_LENGTH * 2 - 1)
+
+#define LOCK(lock) dispatch_semaphore_wait(lock, DISPATCH_TIME_FOREVER);
+#define UNLOCK(lock) dispatch_semaphore_signal(lock);
+
+FOUNDATION_STATIC_INLINE NSUInteger SDCacheCostForImage(UIImage *image) {
+#if SD_MAC
+    return image.size.height * image.size.width;
+#elif SD_UIKIT || SD_WATCH
+    return image.size.height * image.size.width * image.scale * image.scale;
+#endif
+}
+
+// A memory cache which auto purge the cache on memory warning and support weak cache.
+@interface SDMemoryCache <KeyType, ObjectType> : NSCache <KeyType, ObjectType>
+
+@end
+
+// Private
+@interface SDMemoryCache <KeyType, ObjectType> ()
+
+@property (nonatomic, strong, nonnull) SDImageCacheConfig *config;
+@property (nonatomic, strong, nonnull) NSMapTable<KeyType, ObjectType> *weakCache; // strong-weak cache
+@property (nonatomic, strong, nonnull) dispatch_semaphore_t weakCacheLock; // a lock to keep the access to `weakCache` thread-safe
+
+- (instancetype)init NS_UNAVAILABLE;
+- (instancetype)initWithConfig:(nonnull SDImageCacheConfig *)config;
+
+@end
+
+@implementation SDMemoryCache
+
+// Current this seems no use on macOS (macOS use virtual memory and do not clear cache when memory warning). So we only override on iOS/tvOS platform.
+// But in the future there may be more options and features for this subclass.
+#if SD_UIKIT
+
+- (void)dealloc {
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+}
+
+- (instancetype)initWithConfig:(SDImageCacheConfig *)config {
+    self = [super init];
+    if (self) {
+        // Use a strong-weak maptable storing the secondary cache. Follow the doc that NSCache does not copy keys
+        // This is useful when the memory warning, the cache was purged. However, the image instance can be retained by other instance such as imageViews and alive.
+        // At this case, we can sync weak cache back and do not need to load from disk cache
+        self.weakCache = [[NSMapTable alloc] initWithKeyOptions:NSPointerFunctionsStrongMemory valueOptions:NSPointerFunctionsWeakMemory capacity:0];
+        self.weakCacheLock = dispatch_semaphore_create(1);
+        self.config = config;
+        [[NSNotificationCenter defaultCenter] addObserver:self
+                                                 selector:@selector(didReceiveMemoryWarning:)
+                                                     name:UIApplicationDidReceiveMemoryWarningNotification
+                                                   object:nil];
+    }
+    return self;
+}
+
+- (void)didReceiveMemoryWarning:(NSNotification *)notification {
+    // Only remove cache, but keep weak cache
+    [super removeAllObjects];
+}
+
+// `setObject:forKey:` just call this with 0 cost. Override this is enough
+- (void)setObject:(id)obj forKey:(id)key cost:(NSUInteger)g {
+    [super setObject:obj forKey:key cost:g];
+    if (!self.config.shouldUseWeakMemoryCache) {
+        return;
+    }
+    if (key && obj) {
+        // Store weak cache
+        LOCK(self.weakCacheLock);
+        [self.weakCache setObject:obj forKey:key];
+        UNLOCK(self.weakCacheLock);
+    }
+}
+
+- (id)objectForKey:(id)key {
+    id obj = [super objectForKey:key];
+    if (!self.config.shouldUseWeakMemoryCache) {
+        return obj;
+    }
+    if (key && !obj) {
+        // Check weak cache
+        LOCK(self.weakCacheLock);
+        obj = [self.weakCache objectForKey:key];
+        UNLOCK(self.weakCacheLock);
+        if (obj) {
+            // Sync cache
+            NSUInteger cost = 0;
+            if ([obj isKindOfClass:[UIImage class]]) {
+                cost = SDCacheCostForImage(obj);
+            }
+            [super setObject:obj forKey:key cost:cost];
+        }
+    }
+    return obj;
+}
+
+- (void)removeObjectForKey:(id)key {
+    [super removeObjectForKey:key];
+    if (!self.config.shouldUseWeakMemoryCache) {
+        return;
+    }
+    if (key) {
+        // Remove weak cache
+        LOCK(self.weakCacheLock);
+        [self.weakCache removeObjectForKey:key];
+        UNLOCK(self.weakCacheLock);
+    }
+}
+
+- (void)removeAllObjects {
+    [super removeAllObjects];
+    if (!self.config.shouldUseWeakMemoryCache) {
+        return;
+    }
+    // Manually remove should also remove weak cache
+    LOCK(self.weakCacheLock);
+    [self.weakCache removeAllObjects];
+    UNLOCK(self.weakCacheLock);
+}
+
+#else
+
+- (instancetype)initWithConfig:(SDImageCacheConfig *)config {
+    self = [super init];
+    return self;
+}
+
+#endif
+
+@end
+
+@interface SDImageCache ()
+
+#pragma mark - Properties
+@property (strong, nonatomic, nonnull) SDMemoryCache *memCache;
+@property (strong, nonatomic, nonnull) NSString *diskCachePath;
+@property (strong, nonatomic, nullable) NSMutableArray<NSString *> *customPaths;
+@property (strong, nonatomic, nullable) dispatch_queue_t ioQueue;
+@property (strong, nonatomic, nonnull) NSFileManager *fileManager;
+
+@end
+
+
+@implementation SDImageCache
+
+#pragma mark - Singleton, init, dealloc
+
++ (nonnull instancetype)sharedImageCache {
+    static dispatch_once_t once;
+    static id instance;
+    dispatch_once(&once, ^{
+        instance = [self new];
+    });
+    return instance;
+}
+
+- (instancetype)init {
+    return [self initWithNamespace:@"default"];
+}
+
+- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns {
+    NSString *path = [self makeDiskCachePath:ns];
+    return [self initWithNamespace:ns diskCacheDirectory:path];
+}
+
+- (nonnull instancetype)initWithNamespace:(nonnull NSString *)ns
+                       diskCacheDirectory:(nonnull NSString *)directory {
+    if ((self = [super init])) {
+        NSString *fullNamespace = [@"com.hackemist.SDWebImageCache." stringByAppendingString:ns];
+        
+        // Create IO serial queue
+        _ioQueue = dispatch_queue_create("com.hackemist.SDWebImageCache", DISPATCH_QUEUE_SERIAL);
+        
+        _config = [[SDImageCacheConfig alloc] init];
+        
+        // Init the memory cache
+        _memCache = [[SDMemoryCache alloc] initWithConfig:_config];
+        _memCache.name = fullNamespace;
+
+        // Init the disk cache
+        if (directory != nil) {
+            _diskCachePath = [directory stringByAppendingPathComponent:fullNamespace];
+        } else {
+            NSString *path = [self makeDiskCachePath:ns];
+            _diskCachePath = path;
+        }
+
+        dispatch_sync(_ioQueue, ^{
+            self.fileManager = [NSFileManager new];
+        });
+
+#if SD_UIKIT
+        // Subscribe to app events
+        [[NSNotificationCenter defaultCenter] addObserver:self
+                                                 selector:@selector(deleteOldFiles)
+                                                     name:UIApplicationWillTerminateNotification
+                                                   object:nil];
+
+        [[NSNotificationCenter defaultCenter] addObserver:self
+                                                 selector:@selector(backgroundDeleteOldFiles)
+                                                     name:UIApplicationDidEnterBackgroundNotification
+                                                   object:nil];
+#endif
+    }
+
+    return self;
+}
+
+- (void)dealloc {
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+}
+
+#pragma mark - Cache paths
+
+- (void)addReadOnlyCachePath:(nonnull NSString *)path {
+    if (!self.customPaths) {
+        self.customPaths = [NSMutableArray new];
+    }
+
+    if (![self.customPaths containsObject:path]) {
+        [self.customPaths addObject:path];
+    }
+}
+
+- (nullable NSString *)cachePathForKey:(nullable NSString *)key inPath:(nonnull NSString *)path {
+    NSString *filename = [self cachedFileNameForKey:key];
+    return [path stringByAppendingPathComponent:filename];
+}
+
+- (nullable NSString *)defaultCachePathForKey:(nullable NSString *)key {
+    return [self cachePathForKey:key inPath:self.diskCachePath];
+}
+
+- (nullable NSString *)cachedFileNameForKey:(nullable NSString *)key {
+    const char *str = key.UTF8String;
+    if (str == NULL) {
+        str = "";
+    }
+    unsigned char r[CC_MD5_DIGEST_LENGTH];
+    CC_MD5(str, (CC_LONG)strlen(str), r);
+    NSURL *keyURL = [NSURL URLWithString:key];
+    NSString *ext = keyURL ? keyURL.pathExtension : key.pathExtension;
+    // File system has file name length limit, we need to check if ext is too long, we don't add it to the filename
+    if (ext.length > SD_MAX_FILE_EXTENSION_LENGTH) {
+        ext = nil;
+    }
+    NSString *filename = [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%@",
+                          r[0], r[1], r[2], r[3], r[4], r[5], r[6], r[7], r[8], r[9], r[10],
+                          r[11], r[12], r[13], r[14], r[15], ext.length == 0 ? @"" : [NSString stringWithFormat:@".%@", ext]];
+    return filename;
+}
+
+- (nullable NSString *)makeDiskCachePath:(nonnull NSString*)fullNamespace {
+    NSArray<NSString *> *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
+    return [paths[0] stringByAppendingPathComponent:fullNamespace];
+}
+
+#pragma mark - Store Ops
+
+- (void)storeImage:(nullable UIImage *)image
+            forKey:(nullable NSString *)key
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock {
+    [self storeImage:image imageData:nil forKey:key toDisk:YES completion:completionBlock];
+}
+
+- (void)storeImage:(nullable UIImage *)image
+            forKey:(nullable NSString *)key
+            toDisk:(BOOL)toDisk
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock {
+    [self storeImage:image imageData:nil forKey:key toDisk:toDisk completion:completionBlock];
+}
+
+- (void)storeImage:(nullable UIImage *)image
+         imageData:(nullable NSData *)imageData
+            forKey:(nullable NSString *)key
+            toDisk:(BOOL)toDisk
+        completion:(nullable SDWebImageNoParamsBlock)completionBlock {
+    if (!image || !key) {
+        if (completionBlock) {
+            completionBlock();
+        }
+        return;
+    }
+    // if memory cache is enabled
+    if (self.config.shouldCacheImagesInMemory) {
+        NSUInteger cost = SDCacheCostForImage(image);
+        [self.memCache setObject:image forKey:key cost:cost];
+    }
+    
+    if (toDisk) {
+        dispatch_async(self.ioQueue, ^{
+            @autoreleasepool {
+                NSData *data = imageData;
+                if (!data && image) {
+                    // If we do not have any data to detect image format, check whether it contains alpha channel to use PNG or JPEG format
+                    SDImageFormat format;
+                    if (SDCGImageRefContainsAlpha(image.CGImage)) {
+                        format = SDImageFormatPNG;
+                    } else {
+                        format = SDImageFormatJPEG;
+                    }
+                    data = [[SDWebImageCodersManager sharedInstance] encodedDataWithImage:image format:format];
+                }
+                [self _storeImageDataToDisk:data forKey:key];
+            }
+            
+            if (completionBlock) {
+                dispatch_async(dispatch_get_main_queue(), ^{
+                    completionBlock();
+                });
+            }
+        });
+    } else {
+        if (completionBlock) {
+            completionBlock();
+        }
+    }
+}
+
+- (void)storeImageDataToDisk:(nullable NSData *)imageData forKey:(nullable NSString *)key {
+    if (!imageData || !key) {
+        return;
+    }
+    dispatch_sync(self.ioQueue, ^{
+        [self _storeImageDataToDisk:imageData forKey:key];
+    });
+}
+
+// Make sure to call form io queue by caller
+- (void)_storeImageDataToDisk:(nullable NSData *)imageData forKey:(nullable NSString *)key {
+    if (!imageData || !key) {
+        return;
+    }
+    
+    if (![self.fileManager fileExistsAtPath:_diskCachePath]) {
+        [self.fileManager createDirectoryAtPath:_diskCachePath withIntermediateDirectories:YES attributes:nil error:NULL];
+    }
+    
+    // get cache Path for image key
+    NSString *cachePathForKey = [self defaultCachePathForKey:key];
+    // transform to NSUrl
+    NSURL *fileURL = [NSURL fileURLWithPath:cachePathForKey];
+    
+    [imageData writeToURL:fileURL options:self.config.diskCacheWritingOptions error:nil];
+    
+    // disable iCloud backup
+    if (self.config.shouldDisableiCloud) {
+        [fileURL setResourceValue:@YES forKey:NSURLIsExcludedFromBackupKey error:nil];
+    }
+}
+
+#pragma mark - Query and Retrieve Ops
+
+- (void)diskImageExistsWithKey:(nullable NSString *)key completion:(nullable SDWebImageCheckCacheCompletionBlock)completionBlock {
+    dispatch_async(self.ioQueue, ^{
+        BOOL exists = [self _diskImageDataExistsWithKey:key];
+        if (completionBlock) {
+            dispatch_async(dispatch_get_main_queue(), ^{
+                completionBlock(exists);
+            });
+        }
+    });
+}
+
+- (BOOL)diskImageDataExistsWithKey:(nullable NSString *)key {
+    if (!key) {
+        return NO;
+    }
+    __block BOOL exists = NO;
+    dispatch_sync(self.ioQueue, ^{
+        exists = [self _diskImageDataExistsWithKey:key];
+    });
+    
+    return exists;
+}
+
+// Make sure to call form io queue by caller
+- (BOOL)_diskImageDataExistsWithKey:(nullable NSString *)key {
+    if (!key) {
+        return NO;
+    }
+    BOOL exists = [self.fileManager fileExistsAtPath:[self defaultCachePathForKey:key]];
+    
+    // fallback because of https://github.com/SDWebImage/SDWebImage/pull/976 that added the extension to the disk file name
+    // checking the key with and without the extension
+    if (!exists) {
+        exists = [self.fileManager fileExistsAtPath:[self defaultCachePathForKey:key].stringByDeletingPathExtension];
+    }
+    
+    return exists;
+}
+
+- (nullable NSData *)diskImageDataForKey:(nullable NSString *)key {
+    if (!key) {
+        return nil;
+    }
+    __block NSData *imageData = nil;
+    dispatch_sync(self.ioQueue, ^{
+        imageData = [self diskImageDataBySearchingAllPathsForKey:key];
+    });
+    
+    return imageData;
+}
+
+- (nullable UIImage *)imageFromMemoryCacheForKey:(nullable NSString *)key {
+    return [self.memCache objectForKey:key];
+}
+
+- (nullable UIImage *)imageFromDiskCacheForKey:(nullable NSString *)key {
+    UIImage *diskImage = [self diskImageForKey:key];
+    if (diskImage && self.config.shouldCacheImagesInMemory) {
+        NSUInteger cost = SDCacheCostForImage(diskImage);
+        [self.memCache setObject:diskImage forKey:key cost:cost];
+    }
+
+    return diskImage;
+}
+
+- (nullable UIImage *)imageFromCacheForKey:(nullable NSString *)key {
+    // First check the in-memory cache...
+    UIImage *image = [self imageFromMemoryCacheForKey:key];
+    if (image) {
+        return image;
+    }
+    
+    // Second check the disk cache...
+    image = [self imageFromDiskCacheForKey:key];
+    return image;
+}
+
+- (nullable NSData *)diskImageDataBySearchingAllPathsForKey:(nullable NSString *)key {
+    NSString *defaultPath = [self defaultCachePathForKey:key];
+    NSData *data = [NSData dataWithContentsOfFile:defaultPath options:self.config.diskCacheReadingOptions error:nil];
+    if (data) {
+        return data;
+    }
+
+    // fallback because of https://github.com/SDWebImage/SDWebImage/pull/976 that added the extension to the disk file name
+    // checking the key with and without the extension
+    data = [NSData dataWithContentsOfFile:defaultPath.stringByDeletingPathExtension options:self.config.diskCacheReadingOptions error:nil];
+    if (data) {
+        return data;
+    }
+
+    NSArray<NSString *> *customPaths = [self.customPaths copy];
+    for (NSString *path in customPaths) {
+        NSString *filePath = [self cachePathForKey:key inPath:path];
+        NSData *imageData = [NSData dataWithContentsOfFile:filePath options:self.config.diskCacheReadingOptions error:nil];
+        if (imageData) {
+            return imageData;
+        }
+
+        // fallback because of https://github.com/SDWebImage/SDWebImage/pull/976 that added the extension to the disk file name
+        // checking the key with and without the extension
+        imageData = [NSData dataWithContentsOfFile:filePath.stringByDeletingPathExtension options:self.config.diskCacheReadingOptions error:nil];
+        if (imageData) {
+            return imageData;
+        }
+    }
+
+    return nil;
+}
+
+- (nullable UIImage *)diskImageForKey:(nullable NSString *)key {
+    NSData *data = [self diskImageDataForKey:key];
+    return [self diskImageForKey:key data:data];
+}
+
+- (nullable UIImage *)diskImageForKey:(nullable NSString *)key data:(nullable NSData *)data {
+    return [self diskImageForKey:key data:data options:0];
+}
+
+- (nullable UIImage *)diskImageForKey:(nullable NSString *)key data:(nullable NSData *)data options:(SDImageCacheOptions)options {
+    if (data) {
+        UIImage *image = [[SDWebImageCodersManager sharedInstance] decodedImageWithData:data];
+        image = [self scaledImageForKey:key image:image];
+        if (self.config.shouldDecompressImages) {
+            BOOL shouldScaleDown = options & SDImageCacheScaleDownLargeImages;
+            image = [[SDWebImageCodersManager sharedInstance] decompressedImageWithImage:image data:&data options:@{SDWebImageCoderScaleDownLargeImagesKey: @(shouldScaleDown)}];
+        }
+        return image;
+    } else {
+        return nil;
+    }
+}
+
+- (nullable UIImage *)scaledImageForKey:(nullable NSString *)key image:(nullable UIImage *)image {
+    return SDScaledImageForKey(key, image);
+}
+
+- (NSOperation *)queryCacheOperationForKey:(NSString *)key done:(SDCacheQueryCompletedBlock)doneBlock {
+    return [self queryCacheOperationForKey:key options:0 done:doneBlock];
+}
+
+- (nullable NSOperation *)queryCacheOperationForKey:(nullable NSString *)key options:(SDImageCacheOptions)options done:(nullable SDCacheQueryCompletedBlock)doneBlock {
+    if (!key) {
+        if (doneBlock) {
+            doneBlock(nil, nil, SDImageCacheTypeNone);
+        }
+        return nil;
+    }
+    
+    // First check the in-memory cache...
+    UIImage *image = [self imageFromMemoryCacheForKey:key];
+    BOOL shouldQueryMemoryOnly = (image && !(options & SDImageCacheQueryDataWhenInMemory));
+    if (shouldQueryMemoryOnly) {
+        if (doneBlock) {
+            doneBlock(image, nil, SDImageCacheTypeMemory);
+        }
+        return nil;
+    }
+    
+    NSOperation *operation = [NSOperation new];
+    void(^queryDiskBlock)(void) =  ^{
+        if (operation.isCancelled) {
+            // do not call the completion if cancelled
+            return;
+        }
+        
+        @autoreleasepool {
+            NSData *diskData = [self diskImageDataBySearchingAllPathsForKey:key];
+            UIImage *diskImage;
+            SDImageCacheType cacheType = SDImageCacheTypeNone;
+            if (image) {
+                // the image is from in-memory cache
+                diskImage = image;
+                cacheType = SDImageCacheTypeMemory;
+            } else if (diskData) {
+                cacheType = SDImageCacheTypeDisk;
+                // decode image data only if in-memory cache missed
+                diskImage = [self diskImageForKey:key data:diskData options:options];
+                if (diskImage && self.config.shouldCacheImagesInMemory) {
+                    NSUInteger cost = SDCacheCostForImage(diskImage);
+                    [self.memCache setObject:diskImage forKey:key cost:cost];
+                }
+            }
+            
+            if (doneBlock) {
+                if (options & SDImageCacheQueryDiskSync) {
+                    doneBlock(diskImage, diskData, cacheType);
+                } else {
+                    dispatch_async(dispatch_get_main_queue(), ^{
+                        doneBlock(diskImage, diskData, cacheType);
+                    });
+                }
+            }
+        }
+    };
+    
+    if (options & SDImageCacheQueryDiskSync) {
+        queryDiskBlock();
+    } else {
+        dispatch_async(self.ioQueue, queryDiskBlock);
+    }
+    
+    return operation;
+}
+
+#pragma mark - Remove Ops
+
+- (void)removeImageForKey:(nullable NSString *)key withCompletion:(nullable SDWebImageNoParamsBlock)completion {
+    [self removeImageForKey:key fromDisk:YES withCompletion:completion];
+}
+
+- (void)removeImageForKey:(nullable NSString *)key fromDisk:(BOOL)fromDisk withCompletion:(nullable SDWebImageNoParamsBlock)completion {
+    if (key == nil) {
+        return;
+    }
+
+    if (self.config.shouldCacheImagesInMemory) {
+        [self.memCache removeObjectForKey:key];
+    }
+
+    if (fromDisk) {
+        dispatch_async(self.ioQueue, ^{
+            [self.fileManager removeItemAtPath:[self defaultCachePathForKey:key] error:nil];
+            
+            if (completion) {
+                dispatch_async(dispatch_get_main_queue(), ^{
+                    completion();
+                });
+            }
+        });
+    } else if (completion){
+        completion();
+    }
+    
+}
+
+# pragma mark - Mem Cache settings
+
+- (void)setMaxMemoryCost:(NSUInteger)maxMemoryCost {
+    self.memCache.totalCostLimit = maxMemoryCost;
+}
+
+- (NSUInteger)maxMemoryCost {
+    return self.memCache.totalCostLimit;
+}
+
+- (NSUInteger)maxMemoryCountLimit {
+    return self.memCache.countLimit;
+}
+
+- (void)setMaxMemoryCountLimit:(NSUInteger)maxCountLimit {
+    self.memCache.countLimit = maxCountLimit;
+}
+
+#pragma mark - Cache clean Ops
+
+- (void)clearMemory {
+    [self.memCache removeAllObjects];
+}
+
+- (void)clearDiskOnCompletion:(nullable SDWebImageNoParamsBlock)completion {
+    dispatch_async(self.ioQueue, ^{
+        [self.fileManager removeItemAtPath:self.diskCachePath error:nil];
+        [self.fileManager createDirectoryAtPath:self.diskCachePath
+                withIntermediateDirectories:YES
+                                 attributes:nil
+                                      error:NULL];
+
+        if (completion) {
+            dispatch_async(dispatch_get_main_queue(), ^{
+                completion();
+            });
+        }
+    });
+}
+
+- (void)deleteOldFiles {
+    [self deleteOldFilesWithCompletionBlock:nil];
+}
+
+- (void)deleteOldFilesWithCompletionBlock:(nullable SDWebImageNoParamsBlock)completionBlock {
+    dispatch_async(self.ioQueue, ^{
+        NSURL *diskCacheURL = [NSURL fileURLWithPath:self.diskCachePath isDirectory:YES];
+
+        // Compute content date key to be used for tests
+        NSURLResourceKey cacheContentDateKey = NSURLContentModificationDateKey;
+        switch (self.config.diskCacheExpireType) {
+            case SDImageCacheConfigExpireTypeAccessDate:
+                cacheContentDateKey = NSURLContentAccessDateKey;
+                break;
+
+            case SDImageCacheConfigExpireTypeModificationDate:
+                cacheContentDateKey = NSURLContentModificationDateKey;
+                break;
+
+            default:
+                break;
+        }
+        
+        NSArray<NSString *> *resourceKeys = @[NSURLIsDirectoryKey, cacheContentDateKey, NSURLTotalFileAllocatedSizeKey];
+
+        // This enumerator prefetches useful properties for our cache files.
+        NSDirectoryEnumerator *fileEnumerator = [self.fileManager enumeratorAtURL:diskCacheURL
+                                                   includingPropertiesForKeys:resourceKeys
+                                                                      options:NSDirectoryEnumerationSkipsHiddenFiles
+                                                                 errorHandler:NULL];
+
+        NSDate *expirationDate = [NSDate dateWithTimeIntervalSinceNow:-self.config.maxCacheAge];
+        NSMutableDictionary<NSURL *, NSDictionary<NSString *, id> *> *cacheFiles = [NSMutableDictionary dictionary];
+        NSUInteger currentCacheSize = 0;
+
+        // Enumerate all of the files in the cache directory.  This loop has two purposes:
+        //
+        //  1. Removing files that are older than the expiration date.
+        //  2. Storing file attributes for the size-based cleanup pass.
+        NSMutableArray<NSURL *> *urlsToDelete = [[NSMutableArray alloc] init];
+        for (NSURL *fileURL in fileEnumerator) {
+            NSError *error;
+            NSDictionary<NSString *, id> *resourceValues = [fileURL resourceValuesForKeys:resourceKeys error:&error];
+
+            // Skip directories and errors.
+            if (error || !resourceValues || [resourceValues[NSURLIsDirectoryKey] boolValue]) {
+                continue;
+            }
+
+            // Remove files that are older than the expiration date;
+            NSDate *modifiedDate = resourceValues[cacheContentDateKey];
+            if ([[modifiedDate laterDate:expirationDate] isEqualToDate:expirationDate]) {
+                [urlsToDelete addObject:fileURL];
+                continue;
+            }
+            
+            // Store a reference to this file and account for its total size.
+            NSNumber *totalAllocatedSize = resourceValues[NSURLTotalFileAllocatedSizeKey];
+            currentCacheSize += totalAllocatedSize.unsignedIntegerValue;
+            cacheFiles[fileURL] = resourceValues;
+        }
+        
+        for (NSURL *fileURL in urlsToDelete) {
+            [self.fileManager removeItemAtURL:fileURL error:nil];
+        }
+
+        // If our remaining disk cache exceeds a configured maximum size, perform a second
+        // size-based cleanup pass.  We delete the oldest files first.
+        if (self.config.maxCacheSize > 0 && currentCacheSize > self.config.maxCacheSize) {
+            // Target half of our maximum cache size for this cleanup pass.
+            const NSUInteger desiredCacheSize = self.config.maxCacheSize / 2;
+
+            // Sort the remaining cache files by their last modification time or last access time (oldest first).
+            NSArray<NSURL *> *sortedFiles = [cacheFiles keysSortedByValueWithOptions:NSSortConcurrent
+                                                                     usingComparator:^NSComparisonResult(id obj1, id obj2) {
+                                                                         return [obj1[cacheContentDateKey] compare:obj2[cacheContentDateKey]];
+                                                                     }];
+
+            // Delete files until we fall below our desired cache size.
+            for (NSURL *fileURL in sortedFiles) {
+                if ([self.fileManager removeItemAtURL:fileURL error:nil]) {
+                    NSDictionary<NSString *, id> *resourceValues = cacheFiles[fileURL];
+                    NSNumber *totalAllocatedSize = resourceValues[NSURLTotalFileAllocatedSizeKey];
+                    currentCacheSize -= totalAllocatedSize.unsignedIntegerValue;
+
+                    if (currentCacheSize < desiredCacheSize) {
+                        break;
+                    }
+                }
+            }
+        }
+        if (completionBlock) {
+            dispatch_async(dispatch_get_main_queue(), ^{
+                completionBlock();
+            });
+        }
+    });
+}
+
+#if SD_UIKIT
+- (void)backgroundDeleteOldFiles {
+    Class UIApplicationClass = NSClassFromString(@"UIApplication");
+    if(!UIApplicationClass || ![UIApplicationClass respondsToSelector:@selector(sharedApplication)]) {
+        return;
+    }
+    UIApplication *application = [UIApplication performSelector:@selector(sharedApplication)];
+    __block UIBackgroundTaskIdentifier bgTask = [application beginBackgroundTaskWithExpirationHandler:^{
+        // Clean up any unfinished task business by marking where you
+        // stopped or ending the task outright.
+        [application endBackgroundTask:bgTask];
+        bgTask = UIBackgroundTaskInvalid;
+    }];
+
+    // Start the long-running task and return immediately.
+    [self deleteOldFilesWithCompletionBlock:^{
+        [application endBackgroundTask:bgTask];
+        bgTask = UIBackgroundTaskInvalid;
+    }];
+}
+#endif
+
+#pragma mark - Cache Info
+
+- (NSUInteger)getSize {
+    __block NSUInteger size = 0;
+    dispatch_sync(self.ioQueue, ^{
+        NSDirectoryEnumerator *fileEnumerator = [self.fileManager enumeratorAtPath:self.diskCachePath];
+        for (NSString *fileName in fileEnumerator) {
+            NSString *filePath = [self.diskCachePath stringByAppendingPathComponent:fileName];
+            NSDictionary<NSString *, id> *attrs = [self.fileManager attributesOfItemAtPath:filePath error:nil];
+            size += [attrs fileSize];
+        }
+    });
+    return size;
+}
+
+- (NSUInteger)getDiskCount {
+    __block NSUInteger count = 0;
+    dispatch_sync(self.ioQueue, ^{
+        NSDirectoryEnumerator *fileEnumerator = [self.fileManager enumeratorAtPath:self.diskCachePath];
+        count = fileEnumerator.allObjects.count;
+    });
+    return count;
+}
+
+- (void)calculateSizeWithCompletionBlock:(nullable SDWebImageCalculateSizeBlock)completionBlock {
+    NSURL *diskCacheURL = [NSURL fileURLWithPath:self.diskCachePath isDirectory:YES];
+
+    dispatch_async(self.ioQueue, ^{
+        NSUInteger fileCount = 0;
+        NSUInteger totalSize = 0;
+
+        NSDirectoryEnumerator *fileEnumerator = [self.fileManager enumeratorAtURL:diskCacheURL
+                                                   includingPropertiesForKeys:@[NSFileSize]
+                                                                      options:NSDirectoryEnumerationSkipsHiddenFiles
+                                                                 errorHandler:NULL];
+
+        for (NSURL *fileURL in fileEnumerator) {
+            NSNumber *fileSize;
+            [fileURL getResourceValue:&fileSize forKey:NSURLFileSizeKey error:NULL];
+            totalSize += fileSize.unsignedIntegerValue;
+            fileCount += 1;
+        }
+
+        if (completionBlock) {
+            dispatch_async(dispatch_get_main_queue(), ^{
+                completionBlock(fileCount, totalSize);
+            });
+        }
+    });
+}
+
+@end
+

Pods/SDWebImage/SDWebImage/SDImageCacheConfig.h

@@ -0,0 +1,79 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+typedef NS_ENUM(NSUInteger, SDImageCacheConfigExpireType) {
+    /**
+     * When the image is accessed it will update this value
+     */
+    SDImageCacheConfigExpireTypeAccessDate,
+    /**
+     * The image was obtained from the disk cache (Default)
+     */
+    SDImageCacheConfigExpireTypeModificationDate
+};
+
+@interface SDImageCacheConfig : NSObject
+
+/**
+ * Decompressing images that are downloaded and cached can improve performance but can consume lot of memory.
+ * Defaults to YES. Set this to NO if you are experiencing a crash due to excessive memory consumption.
+ */
+@property (assign, nonatomic) BOOL shouldDecompressImages;
+
+/**
+ * Whether or not to disable iCloud backup
+ * Defaults to YES.
+ */
+@property (assign, nonatomic) BOOL shouldDisableiCloud;
+
+/**
+ * Whether or not to use memory cache
+ * @note When the memory cache is disabled, the weak memory cache will also be disabled.
+ * Defaults to YES.
+ */
+@property (assign, nonatomic) BOOL shouldCacheImagesInMemory;
+
+/**
+ * The option to control weak memory cache for images. When enable, `SDImageCache`'s memory cache will use a weak maptable to store the image at the same time when it stored to memory, and get removed at the same time.
+ * However when memory warning is triggered, since the weak maptable does not hold a strong reference to image instacnce, even when the memory cache itself is purged, some images which are held strongly by UIImageViews or other live instances can be recovered again, to avoid later re-query from disk cache or network. This may be helpful for the case, for example, when app enter background and memory is purged, cause cell flashing after re-enter foreground.
+ * Defautls to YES. You can change this option dynamically.
+ */
+@property (assign, nonatomic) BOOL shouldUseWeakMemoryCache;
+
+/**
+ * The reading options while reading cache from disk.
+ * Defaults to 0. You can set this to `NSDataReadingMappedIfSafe` to improve performance.
+ */
+@property (assign, nonatomic) NSDataReadingOptions diskCacheReadingOptions;
+
+/**
+ * The writing options while writing cache to disk.
+ * Defaults to `NSDataWritingAtomic`. You can set this to `NSDataWritingWithoutOverwriting` to prevent overwriting an existing file.
+ */
+@property (assign, nonatomic) NSDataWritingOptions diskCacheWritingOptions;
+
+/**
+ * The maximum length of time to keep an image in the cache, in seconds.
+ */
+@property (assign, nonatomic) NSInteger maxCacheAge;
+
+/**
+ * The maximum size of the cache, in bytes.
+ */
+@property (assign, nonatomic) NSUInteger maxCacheSize;
+
+/**
+ * The attribute which the clear cache will be checked against when clearing the disk cache
+ * Default is Modified Date
+ */
+@property (assign, nonatomic) SDImageCacheConfigExpireType diskCacheExpireType;
+
+@end

Pods/SDWebImage/SDWebImage/SDImageCacheConfig.m

@@ -0,0 +1,30 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDImageCacheConfig.h"
+
+static const NSInteger kDefaultCacheMaxCacheAge = 60 * 60 * 24 * 7; // 1 week
+
+@implementation SDImageCacheConfig
+
+- (instancetype)init {
+    if (self = [super init]) {
+        _shouldDecompressImages = YES;
+        _shouldDisableiCloud = YES;
+        _shouldCacheImagesInMemory = YES;
+        _shouldUseWeakMemoryCache = YES;
+        _diskCacheReadingOptions = 0;
+        _diskCacheWritingOptions = NSDataWritingAtomic;
+        _maxCacheAge = kDefaultCacheMaxCacheAge;
+        _maxCacheSize = 0;
+        _diskCacheExpireType = SDImageCacheConfigExpireTypeModificationDate;
+    }
+    return self;
+}
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageCoder.h

@@ -0,0 +1,119 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+#import "NSData+ImageContentType.h"
+
+/**
+ A Boolean value indicating whether to scale down large images during decompressing. (NSNumber)
+ */
+FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageCoderScaleDownLargeImagesKey;
+
+/**
+ Return the shared device-dependent RGB color space created with CGColorSpaceCreateDeviceRGB.
+
+ @return The device-dependent RGB color space
+ */
+CG_EXTERN CGColorSpaceRef _Nonnull SDCGColorSpaceGetDeviceRGB(void);
+
+/**
+ Check whether CGImageRef contains alpha channel.
+
+ @param imageRef The CGImageRef
+ @return Return YES if CGImageRef contains alpha channel, otherwise return NO
+ */
+CG_EXTERN BOOL SDCGImageRefContainsAlpha(_Nullable CGImageRef imageRef);
+
+
+/**
+ This is the image coder protocol to provide custom image decoding/encoding.
+ These methods are all required to implement.
+ @note Pay attention that these methods are not called from main queue.
+ */
+@protocol SDWebImageCoder <NSObject>
+
+@required
+#pragma mark - Decoding
+/**
+ Returns YES if this coder can decode some data. Otherwise, the data should be passed to another coder.
+ 
+ @param data The image data so we can look at it
+ @return YES if this coder can decode the data, NO otherwise
+ */
+- (BOOL)canDecodeFromData:(nullable NSData *)data;
+
+/**
+ Decode the image data to image.
+
+ @param data The image data to be decoded
+ @return The decoded image from data
+ */
+- (nullable UIImage *)decodedImageWithData:(nullable NSData *)data;
+
+/**
+ Decompress the image with original image and image data.
+
+ @param image The original image to be decompressed
+ @param data The pointer to original image data. The pointer itself is nonnull but image data can be null. This data will set to cache if needed. If you do not need to modify data at the sametime, ignore this param.
+ @param optionsDict A dictionary containing any decompressing options. Pass {SDWebImageCoderScaleDownLargeImagesKey: @(YES)} to scale down large images
+ @return The decompressed image
+ */
+- (nullable UIImage *)decompressedImageWithImage:(nullable UIImage *)image
+                                            data:(NSData * _Nullable * _Nonnull)data
+                                         options:(nullable NSDictionary<NSString*, NSObject*>*)optionsDict;
+
+#pragma mark - Encoding
+
+/**
+ Returns YES if this coder can encode some image. Otherwise, it should be passed to another coder.
+ 
+ @param format The image format
+ @return YES if this coder can encode the image, NO otherwise
+ */
+- (BOOL)canEncodeToFormat:(SDImageFormat)format;
+
+/**
+ Encode the image to image data.
+
+ @param image The image to be encoded
+ @param format The image format to encode, you should note `SDImageFormatUndefined` format is also  possible
+ @return The encoded image data
+ */
+- (nullable NSData *)encodedDataWithImage:(nullable UIImage *)image format:(SDImageFormat)format;
+
+@end
+
+
+/**
+ This is the image coder protocol to provide custom progressive image decoding.
+ These methods are all required to implement.
+ @note Pay attention that these methods are not called from main queue.
+ */
+@protocol SDWebImageProgressiveCoder <SDWebImageCoder>
+
+@required
+/**
+ Returns YES if this coder can incremental decode some data. Otherwise, it should be passed to another coder.
+ 
+ @param data The image data so we can look at it
+ @return YES if this coder can decode the data, NO otherwise
+ */
+- (BOOL)canIncrementallyDecodeFromData:(nullable NSData *)data;
+
+/**
+ Incremental decode the image data to image.
+ 
+ @param data The image data has been downloaded so far
+ @param finished Whether the download has finished
+ @warning because incremental decoding need to keep the decoded context, we will alloc a new instance with the same class for each download operation to avoid conflicts
+ @return The decoded image from data
+ */
+- (nullable UIImage *)incrementallyDecodedImageWithData:(nullable NSData *)data finished:(BOOL)finished;
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageCoder.m

@@ -0,0 +1,31 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCoder.h"
+
+NSString * const SDWebImageCoderScaleDownLargeImagesKey = @"scaleDownLargeImages";
+
+CGColorSpaceRef SDCGColorSpaceGetDeviceRGB(void) {
+    static CGColorSpaceRef colorSpace;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        colorSpace = CGColorSpaceCreateDeviceRGB();
+    });
+    return colorSpace;
+}
+
+BOOL SDCGImageRefContainsAlpha(CGImageRef imageRef) {
+    if (!imageRef) {
+        return NO;
+    }
+    CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(imageRef);
+    BOOL hasAlpha = !(alphaInfo == kCGImageAlphaNone ||
+                      alphaInfo == kCGImageAlphaNoneSkipFirst ||
+                      alphaInfo == kCGImageAlphaNoneSkipLast);
+    return hasAlpha;
+}

Pods/SDWebImage/SDWebImage/SDWebImageCoderHelper.h

@@ -0,0 +1,52 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+#import "SDWebImageFrame.h"
+
+@interface SDWebImageCoderHelper : NSObject
+
+/**
+ Return an animated image with frames array.
+ For UIKit, this will apply the patch and then create animated UIImage. The patch is because that `+[UIImage animatedImageWithImages:duration:]` just use the average of duration for each image. So it will not work if different frame has different duration. Therefore we repeat the specify frame for specify times to let it work.
+ For AppKit, NSImage does not support animates other than GIF. This will try to encode the frames to GIF format and then create an animated NSImage for rendering. Attention the animated image may loss some detail if the input frames contain full alpha channel because GIF only supports 1 bit alpha channel. (For 1 pixel, either transparent or not)
+
+ @param frames The frames array. If no frames or frames is empty, return nil
+ @return A animated image for rendering on UIImageView(UIKit) or NSImageView(AppKit)
+ */
++ (UIImage * _Nullable)animatedImageWithFrames:(NSArray<SDWebImageFrame *> * _Nullable)frames;
+
+/**
+ Return frames array from an animated image.
+ For UIKit, this will unapply the patch for the description above and then create frames array. This will also work for normal animated UIImage.
+ For AppKit, NSImage does not support animates other than GIF. This will try to decode the GIF imageRep and then create frames array.
+
+ @param animatedImage A animated image. If it's not animated, return nil
+ @return The frames array
+ */
++ (NSArray<SDWebImageFrame *> * _Nullable)framesFromAnimatedImage:(UIImage * _Nullable)animatedImage;
+
+#if SD_UIKIT || SD_WATCH
+/**
+ Convert an EXIF image orientation to an iOS one.
+
+ @param exifOrientation EXIF orientation
+ @return iOS orientation
+ */
++ (UIImageOrientation)imageOrientationFromEXIFOrientation:(NSInteger)exifOrientation;
+/**
+ Convert an iOS orientation to an EXIF image orientation.
+
+ @param imageOrientation iOS orientation
+ @return EXIF orientation
+ */
++ (NSInteger)exifOrientationFromImageOrientation:(UIImageOrientation)imageOrientation;
+#endif
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageCoderHelper.m

@@ -0,0 +1,258 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCoderHelper.h"
+#import "SDWebImageFrame.h"
+#import "UIImage+MultiFormat.h"
+#import "NSImage+WebCache.h"
+#import <ImageIO/ImageIO.h>
+#import "SDAnimatedImageRep.h"
+
+@implementation SDWebImageCoderHelper
+
++ (UIImage *)animatedImageWithFrames:(NSArray<SDWebImageFrame *> *)frames {
+    NSUInteger frameCount = frames.count;
+    if (frameCount == 0) {
+        return nil;
+    }
+    
+    UIImage *animatedImage;
+    
+#if SD_UIKIT || SD_WATCH
+    NSUInteger durations[frameCount];
+    for (size_t i = 0; i < frameCount; i++) {
+        durations[i] = frames[i].duration * 1000;
+    }
+    NSUInteger const gcd = gcdArray(frameCount, durations);
+    __block NSUInteger totalDuration = 0;
+    NSMutableArray<UIImage *> *animatedImages = [NSMutableArray arrayWithCapacity:frameCount];
+    [frames enumerateObjectsUsingBlock:^(SDWebImageFrame * _Nonnull frame, NSUInteger idx, BOOL * _Nonnull stop) {
+        UIImage *image = frame.image;
+        NSUInteger duration = frame.duration * 1000;
+        totalDuration += duration;
+        NSUInteger repeatCount;
+        if (gcd) {
+            repeatCount = duration / gcd;
+        } else {
+            repeatCount = 1;
+        }
+        for (size_t i = 0; i < repeatCount; ++i) {
+            [animatedImages addObject:image];
+        }
+    }];
+    
+    animatedImage = [UIImage animatedImageWithImages:animatedImages duration:totalDuration / 1000.f];
+    
+#else
+    
+    NSMutableData *imageData = [NSMutableData data];
+    CFStringRef imageUTType = [NSData sd_UTTypeFromSDImageFormat:SDImageFormatGIF];
+    // Create an image destination. GIF does not support EXIF image orientation
+    CGImageDestinationRef imageDestination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)imageData, imageUTType, frameCount, NULL);
+    if (!imageDestination) {
+        // Handle failure.
+        return nil;
+    }
+    
+    for (size_t i = 0; i < frameCount; i++) {
+        @autoreleasepool {
+            SDWebImageFrame *frame = frames[i];
+            float frameDuration = frame.duration;
+            CGImageRef frameImageRef = frame.image.CGImage;
+            NSDictionary *frameProperties = @{(__bridge NSString *)kCGImagePropertyGIFDictionary : @{(__bridge NSString *)kCGImagePropertyGIFDelayTime : @(frameDuration)}};
+            CGImageDestinationAddImage(imageDestination, frameImageRef, (__bridge CFDictionaryRef)frameProperties);
+        }
+    }
+    // Finalize the destination.
+    if (CGImageDestinationFinalize(imageDestination) == NO) {
+        // Handle failure.
+        CFRelease(imageDestination);
+        return nil;
+    }
+    CFRelease(imageDestination);
+    SDAnimatedImageRep *imageRep = [[SDAnimatedImageRep alloc] initWithData:imageData];
+    animatedImage = [[NSImage alloc] initWithSize:imageRep.size];
+    [animatedImage addRepresentation:imageRep];
+#endif
+    
+    return animatedImage;
+}
+
++ (NSArray<SDWebImageFrame *> *)framesFromAnimatedImage:(UIImage *)animatedImage {
+    if (!animatedImage) {
+        return nil;
+    }
+    
+    NSMutableArray<SDWebImageFrame *> *frames = [NSMutableArray array];
+    NSUInteger frameCount = 0;
+    
+#if SD_UIKIT || SD_WATCH
+    NSArray<UIImage *> *animatedImages = animatedImage.images;
+    frameCount = animatedImages.count;
+    if (frameCount == 0) {
+        return nil;
+    }
+    
+    NSTimeInterval avgDuration = animatedImage.duration / frameCount;
+    if (avgDuration == 0) {
+        avgDuration = 0.1; // if it's a animated image but no duration, set it to default 100ms (this do not have that 10ms limit like GIF or WebP to allow custom coder provide the limit)
+    }
+    
+    __block NSUInteger index = 0;
+    __block NSUInteger repeatCount = 1;
+    __block UIImage *previousImage = animatedImages.firstObject;
+    [animatedImages enumerateObjectsUsingBlock:^(UIImage * _Nonnull image, NSUInteger idx, BOOL * _Nonnull stop) {
+        // ignore first
+        if (idx == 0) {
+            return;
+        }
+        if ([image isEqual:previousImage]) {
+            repeatCount++;
+        } else {
+            SDWebImageFrame *frame = [SDWebImageFrame frameWithImage:previousImage duration:avgDuration * repeatCount];
+            [frames addObject:frame];
+            repeatCount = 1;
+            index++;
+        }
+        previousImage = image;
+        // last one
+        if (idx == frameCount - 1) {
+            SDWebImageFrame *frame = [SDWebImageFrame frameWithImage:previousImage duration:avgDuration * repeatCount];
+            [frames addObject:frame];
+        }
+    }];
+    
+#else
+    
+    NSBitmapImageRep *bitmapRep;
+    for (NSImageRep *imageRep in animatedImage.representations) {
+        if ([imageRep isKindOfClass:[NSBitmapImageRep class]]) {
+            bitmapRep = (NSBitmapImageRep *)imageRep;
+            break;
+        }
+    }
+    if (bitmapRep) {
+        frameCount = [[bitmapRep valueForProperty:NSImageFrameCount] unsignedIntegerValue];
+    }
+    
+    if (frameCount == 0) {
+        return nil;
+    }
+    
+    for (size_t i = 0; i < frameCount; i++) {
+        @autoreleasepool {
+            // NSBitmapImageRep need to manually change frame. "Good taste" API
+            [bitmapRep setProperty:NSImageCurrentFrame withValue:@(i)];
+            float frameDuration = [[bitmapRep valueForProperty:NSImageCurrentFrameDuration] floatValue];
+            NSImage *frameImage = [[NSImage alloc] initWithCGImage:bitmapRep.CGImage size:CGSizeZero];
+            SDWebImageFrame *frame = [SDWebImageFrame frameWithImage:frameImage duration:frameDuration];
+            [frames addObject:frame];
+        }
+    }
+#endif
+    
+    return frames;
+}
+
+#if SD_UIKIT || SD_WATCH
+// Convert an EXIF image orientation to an iOS one.
++ (UIImageOrientation)imageOrientationFromEXIFOrientation:(NSInteger)exifOrientation {
+    // CGImagePropertyOrientation is available on iOS 8 above. Currently kept for compatibility
+    UIImageOrientation imageOrientation = UIImageOrientationUp;
+    switch (exifOrientation) {
+        case 1:
+            imageOrientation = UIImageOrientationUp;
+            break;
+        case 3:
+            imageOrientation = UIImageOrientationDown;
+            break;
+        case 8:
+            imageOrientation = UIImageOrientationLeft;
+            break;
+        case 6:
+            imageOrientation = UIImageOrientationRight;
+            break;
+        case 2:
+            imageOrientation = UIImageOrientationUpMirrored;
+            break;
+        case 4:
+            imageOrientation = UIImageOrientationDownMirrored;
+            break;
+        case 5:
+            imageOrientation = UIImageOrientationLeftMirrored;
+            break;
+        case 7:
+            imageOrientation = UIImageOrientationRightMirrored;
+            break;
+        default:
+            break;
+    }
+    return imageOrientation;
+}
+
+// Convert an iOS orientation to an EXIF image orientation.
++ (NSInteger)exifOrientationFromImageOrientation:(UIImageOrientation)imageOrientation {
+    // CGImagePropertyOrientation is available on iOS 8 above. Currently kept for compatibility
+    NSInteger exifOrientation = 1;
+    switch (imageOrientation) {
+        case UIImageOrientationUp:
+            exifOrientation = 1;
+            break;
+        case UIImageOrientationDown:
+            exifOrientation = 3;
+            break;
+        case UIImageOrientationLeft:
+            exifOrientation = 8;
+            break;
+        case UIImageOrientationRight:
+            exifOrientation = 6;
+            break;
+        case UIImageOrientationUpMirrored:
+            exifOrientation = 2;
+            break;
+        case UIImageOrientationDownMirrored:
+            exifOrientation = 4;
+            break;
+        case UIImageOrientationLeftMirrored:
+            exifOrientation = 5;
+            break;
+        case UIImageOrientationRightMirrored:
+            exifOrientation = 7;
+            break;
+        default:
+            break;
+    }
+    return exifOrientation;
+}
+#endif
+
+#pragma mark - Helper Fuction
+#if SD_UIKIT || SD_WATCH
+static NSUInteger gcd(NSUInteger a, NSUInteger b) {
+    NSUInteger c;
+    while (a != 0) {
+        c = a;
+        a = b % a;
+        b = c;
+    }
+    return b;
+}
+
+static NSUInteger gcdArray(size_t const count, NSUInteger const * const values) {
+    if (count == 0) {
+        return 0;
+    }
+    NSUInteger result = values[0];
+    for (size_t i = 1; i < count; ++i) {
+        result = gcd(values[i], result);
+    }
+    return result;
+}
+#endif
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageCodersManager.h

@@ -0,0 +1,58 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCoder.h"
+
+/**
+ Global object holding the array of coders, so that we avoid passing them from object to object.
+ Uses a priority queue behind scenes, which means the latest added coders have the highest priority.
+ This is done so when encoding/decoding something, we go through the list and ask each coder if they can handle the current data.
+ That way, users can add their custom coders while preserving our existing prebuilt ones
+ 
+ Note: the `coders` getter will return the coders in their reversed order
+ Example:
+ - by default we internally set coders = `IOCoder`, `WebPCoder`. (`GIFCoder` is not recommended to add only if you want to get GIF support without `FLAnimatedImage`)
+ - calling `coders` will return `@[WebPCoder, IOCoder]`
+ - call `[addCoder:[MyCrazyCoder new]]`
+ - calling `coders` now returns `@[MyCrazyCoder, WebPCoder, IOCoder]`
+ 
+ Coders
+ ------
+ A coder must conform to the `SDWebImageCoder` protocol or even to `SDWebImageProgressiveCoder` if it supports progressive decoding
+ Conformance is important because that way, they will implement `canDecodeFromData` or `canEncodeToFormat`
+ Those methods are called on each coder in the array (using the priority order) until one of them returns YES.
+ That means that coder can decode that data / encode to that format
+ */
+@interface SDWebImageCodersManager : NSObject<SDWebImageCoder>
+
+/**
+ Shared reusable instance
+ */
++ (nonnull instancetype)sharedInstance;
+
+/**
+ All coders in coders manager. The coders array is a priority queue, which means the later added coder will have the highest priority
+ */
+@property (nonatomic, copy, readwrite, nullable) NSArray<id<SDWebImageCoder>> *coders;
+
+/**
+ Add a new coder to the end of coders array. Which has the highest priority.
+
+ @param coder coder
+ */
+- (void)addCoder:(nonnull id<SDWebImageCoder>)coder;
+
+/**
+ Remove a coder in the coders array.
+
+ @param coder coder
+ */
+- (void)removeCoder:(nonnull id<SDWebImageCoder>)coder;
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageCodersManager.m

@@ -0,0 +1,148 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCodersManager.h"
+#import "SDWebImageImageIOCoder.h"
+#import "SDWebImageGIFCoder.h"
+#ifdef SD_WEBP
+#import "SDWebImageWebPCoder.h"
+#endif
+#import "UIImage+MultiFormat.h"
+
+#define LOCK(lock) dispatch_semaphore_wait(lock, DISPATCH_TIME_FOREVER);
+#define UNLOCK(lock) dispatch_semaphore_signal(lock);
+
+@interface SDWebImageCodersManager ()
+
+@property (nonatomic, strong, nonnull) dispatch_semaphore_t codersLock;
+
+@end
+
+@implementation SDWebImageCodersManager
+
++ (nonnull instancetype)sharedInstance {
+    static dispatch_once_t once;
+    static id instance;
+    dispatch_once(&once, ^{
+        instance = [self new];
+    });
+    return instance;
+}
+
+- (instancetype)init {
+    if (self = [super init]) {
+        // initialize with default coders
+        NSMutableArray<id<SDWebImageCoder>> *mutableCoders = [@[[SDWebImageImageIOCoder sharedCoder]] mutableCopy];
+#ifdef SD_WEBP
+        [mutableCoders addObject:[SDWebImageWebPCoder sharedCoder]];
+#endif
+        _coders = [mutableCoders copy];
+        _codersLock = dispatch_semaphore_create(1);
+    }
+    return self;
+}
+
+#pragma mark - Coder IO operations
+
+- (void)addCoder:(nonnull id<SDWebImageCoder>)coder {
+    if (![coder conformsToProtocol:@protocol(SDWebImageCoder)]) {
+        return;
+    }
+    LOCK(self.codersLock);
+    NSMutableArray<id<SDWebImageCoder>> *mutableCoders = [self.coders mutableCopy];
+    if (!mutableCoders) {
+        mutableCoders = [NSMutableArray array];
+    }
+    [mutableCoders addObject:coder];
+    self.coders = [mutableCoders copy];
+    UNLOCK(self.codersLock);
+}
+
+- (void)removeCoder:(nonnull id<SDWebImageCoder>)coder {
+    if (![coder conformsToProtocol:@protocol(SDWebImageCoder)]) {
+        return;
+    }
+    LOCK(self.codersLock);
+    NSMutableArray<id<SDWebImageCoder>> *mutableCoders = [self.coders mutableCopy];
+    [mutableCoders removeObject:coder];
+    self.coders = [mutableCoders copy];
+    UNLOCK(self.codersLock);
+}
+
+#pragma mark - SDWebImageCoder
+- (BOOL)canDecodeFromData:(NSData *)data {
+    LOCK(self.codersLock);
+    NSArray<id<SDWebImageCoder>> *coders = self.coders;
+    UNLOCK(self.codersLock);
+    for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
+        if ([coder canDecodeFromData:data]) {
+            return YES;
+        }
+    }
+    return NO;
+}
+
+- (BOOL)canEncodeToFormat:(SDImageFormat)format {
+    LOCK(self.codersLock);
+    NSArray<id<SDWebImageCoder>> *coders = self.coders;
+    UNLOCK(self.codersLock);
+    for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
+        if ([coder canEncodeToFormat:format]) {
+            return YES;
+        }
+    }
+    return NO;
+}
+
+- (UIImage *)decodedImageWithData:(NSData *)data {
+    LOCK(self.codersLock);
+    NSArray<id<SDWebImageCoder>> *coders = self.coders;
+    UNLOCK(self.codersLock);
+    for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
+        if ([coder canDecodeFromData:data]) {
+            return [coder decodedImageWithData:data];
+        }
+    }
+    return nil;
+}
+
+- (UIImage *)decompressedImageWithImage:(UIImage *)image
+                                   data:(NSData *__autoreleasing  _Nullable *)data
+                                options:(nullable NSDictionary<NSString*, NSObject*>*)optionsDict {
+    if (!image) {
+        return nil;
+    }
+    LOCK(self.codersLock);
+    NSArray<id<SDWebImageCoder>> *coders = self.coders;
+    UNLOCK(self.codersLock);
+    for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
+        if ([coder canDecodeFromData:*data]) {
+            UIImage *decompressedImage = [coder decompressedImageWithImage:image data:data options:optionsDict];
+            decompressedImage.sd_imageFormat = image.sd_imageFormat;
+            return decompressedImage;
+        }
+    }
+    return nil;
+}
+
+- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format {
+    if (!image) {
+        return nil;
+    }
+    LOCK(self.codersLock);
+    NSArray<id<SDWebImageCoder>> *coders = self.coders;
+    UNLOCK(self.codersLock);
+    for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
+        if ([coder canEncodeToFormat:format]) {
+            return [coder encodedDataWithImage:image format:format];
+        }
+    }
+    return nil;
+}
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageCompat.h

@@ -0,0 +1,107 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Jamie Pinkham
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <TargetConditionals.h>
+
+#ifdef __OBJC_GC__
+    #error SDWebImage does not support Objective-C Garbage Collection
+#endif
+
+// Apple's defines from TargetConditionals.h are a bit weird.
+// Seems like TARGET_OS_MAC is always defined (on all platforms).
+// To determine if we are running on OSX, we can only rely on TARGET_OS_IPHONE=0 and all the other platforms
+#if !TARGET_OS_IPHONE && !TARGET_OS_IOS && !TARGET_OS_TV && !TARGET_OS_WATCH
+    #define SD_MAC 1
+#else
+    #define SD_MAC 0
+#endif
+
+// iOS and tvOS are very similar, UIKit exists on both platforms
+// Note: watchOS also has UIKit, but it's very limited
+#if TARGET_OS_IOS || TARGET_OS_TV
+    #define SD_UIKIT 1
+#else
+    #define SD_UIKIT 0
+#endif
+
+#if TARGET_OS_IOS
+    #define SD_IOS 1
+#else
+    #define SD_IOS 0
+#endif
+
+#if TARGET_OS_TV
+    #define SD_TV 1
+#else
+    #define SD_TV 0
+#endif
+
+#if TARGET_OS_WATCH
+    #define SD_WATCH 1
+#else
+    #define SD_WATCH 0
+#endif
+
+
+#if SD_MAC
+    #import <AppKit/AppKit.h>
+    #ifndef UIImage
+        #define UIImage NSImage
+    #endif
+    #ifndef UIImageView
+        #define UIImageView NSImageView
+    #endif
+    #ifndef UIView
+        #define UIView NSView
+    #endif
+#else
+    #if __IPHONE_OS_VERSION_MIN_REQUIRED != 20000 && __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_5_0
+        #error SDWebImage doesn't support Deployment Target version < 5.0
+    #endif
+
+    #if SD_UIKIT
+        #import <UIKit/UIKit.h>
+    #endif
+    #if SD_WATCH
+        #import <WatchKit/WatchKit.h>
+        #ifndef UIView
+            #define UIView WKInterfaceObject
+        #endif
+        #ifndef UIImageView
+            #define UIImageView WKInterfaceImage
+        #endif
+    #endif
+#endif
+
+#ifndef NS_ENUM
+#define NS_ENUM(_type, _name) enum _name : _type _name; enum _name : _type
+#endif
+
+#ifndef NS_OPTIONS
+#define NS_OPTIONS(_type, _name) enum _name : _type _name; enum _name : _type
+#endif
+
+FOUNDATION_EXPORT UIImage *SDScaledImageForKey(NSString *key, UIImage *image);
+
+typedef void(^SDWebImageNoParamsBlock)(void);
+
+FOUNDATION_EXPORT NSString *const SDWebImageErrorDomain;
+
+#ifndef dispatch_queue_async_safe
+#define dispatch_queue_async_safe(queue, block)\
+    if (dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL) == dispatch_queue_get_label(queue)) {\
+        block();\
+    } else {\
+        dispatch_async(queue, block);\
+    }
+#endif
+
+#ifndef dispatch_main_async_safe
+#define dispatch_main_async_safe(block) dispatch_queue_async_safe(dispatch_get_main_queue(), block)
+#endif

Pods/SDWebImage/SDWebImage/SDWebImageCompat.m

@@ -0,0 +1,71 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import "UIImage+MultiFormat.h"
+
+#if !__has_feature(objc_arc)
+    #error SDWebImage is ARC only. Either turn on ARC for the project or use -fobjc-arc flag
+#endif
+
+#if !OS_OBJECT_USE_OBJC
+    #error SDWebImage need ARC for dispatch object
+#endif
+
+inline UIImage *SDScaledImageForKey(NSString * _Nullable key, UIImage * _Nullable image) {
+    if (!image) {
+        return nil;
+    }
+    
+#if SD_MAC
+    return image;
+#elif SD_UIKIT || SD_WATCH
+    if ((image.images).count > 0) {
+        NSMutableArray<UIImage *> *scaledImages = [NSMutableArray array];
+
+        for (UIImage *tempImage in image.images) {
+            [scaledImages addObject:SDScaledImageForKey(key, tempImage)];
+        }
+        
+        UIImage *animatedImage = [UIImage animatedImageWithImages:scaledImages duration:image.duration];
+        if (animatedImage) {
+            animatedImage.sd_imageLoopCount = image.sd_imageLoopCount;
+            animatedImage.sd_imageFormat = image.sd_imageFormat;
+        }
+        return animatedImage;
+    } else {
+#if SD_WATCH
+        if ([[WKInterfaceDevice currentDevice] respondsToSelector:@selector(screenScale)]) {
+#elif SD_UIKIT
+        if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
+#endif
+            CGFloat scale = 1;
+            if (key.length >= 8) {
+                NSRange range = [key rangeOfString:@"@2x."];
+                if (range.location != NSNotFound) {
+                    scale = 2.0;
+                }
+                
+                range = [key rangeOfString:@"@3x."];
+                if (range.location != NSNotFound) {
+                    scale = 3.0;
+                }
+            }
+            
+            if (scale != image.scale) {
+                UIImage *scaledImage = [[UIImage alloc] initWithCGImage:image.CGImage scale:scale orientation:image.imageOrientation];
+                scaledImage.sd_imageFormat = image.sd_imageFormat;
+                image = scaledImage;
+            }
+        }
+        return image;
+    }
+#endif
+}
+
+NSString *const SDWebImageErrorDomain = @"SDWebImageErrorDomain";

Pods/SDWebImage/SDWebImage/SDWebImageDownloader.h

@@ -0,0 +1,272 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+#import "SDWebImageOperation.h"
+
+typedef NS_OPTIONS(NSUInteger, SDWebImageDownloaderOptions) {
+    /**
+     * Put the download in the low queue priority and task priority.
+     */
+    SDWebImageDownloaderLowPriority = 1 << 0,
+    
+    /**
+     * This flag enables progressive download, the image is displayed progressively during download as a browser would do.
+     */
+    SDWebImageDownloaderProgressiveDownload = 1 << 1,
+
+    /**
+     * By default, request prevent the use of NSURLCache. With this flag, NSURLCache
+     * is used with default policies.
+     */
+    SDWebImageDownloaderUseNSURLCache = 1 << 2,
+
+    /**
+     * Call completion block with nil image/imageData if the image was read from NSURLCache
+     * (to be combined with `SDWebImageDownloaderUseNSURLCache`).
+     */
+    SDWebImageDownloaderIgnoreCachedResponse = 1 << 3,
+    
+    /**
+     * In iOS 4+, continue the download of the image if the app goes to background. This is achieved by asking the system for
+     * extra time in background to let the request finish. If the background task expires the operation will be cancelled.
+     */
+    SDWebImageDownloaderContinueInBackground = 1 << 4,
+
+    /**
+     * Handles cookies stored in NSHTTPCookieStore by setting 
+     * NSMutableURLRequest.HTTPShouldHandleCookies = YES;
+     */
+    SDWebImageDownloaderHandleCookies = 1 << 5,
+
+    /**
+     * Enable to allow untrusted SSL certificates.
+     * Useful for testing purposes. Use with caution in production.
+     */
+    SDWebImageDownloaderAllowInvalidSSLCertificates = 1 << 6,
+
+    /**
+     * Put the download in the high queue priority and task priority.
+     */
+    SDWebImageDownloaderHighPriority = 1 << 7,
+    
+    /**
+     * Scale down the image
+     */
+    SDWebImageDownloaderScaleDownLargeImages = 1 << 8,
+};
+
+typedef NS_ENUM(NSInteger, SDWebImageDownloaderExecutionOrder) {
+    /**
+     * Default value. All download operations will execute in queue style (first-in-first-out).
+     */
+    SDWebImageDownloaderFIFOExecutionOrder,
+
+    /**
+     * All download operations will execute in stack style (last-in-first-out).
+     */
+    SDWebImageDownloaderLIFOExecutionOrder
+};
+
+FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageDownloadStartNotification;
+FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageDownloadStopNotification;
+
+typedef void(^SDWebImageDownloaderProgressBlock)(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL);
+
+typedef void(^SDWebImageDownloaderCompletedBlock)(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished);
+
+typedef NSDictionary<NSString *, NSString *> SDHTTPHeadersDictionary;
+typedef NSMutableDictionary<NSString *, NSString *> SDHTTPHeadersMutableDictionary;
+
+typedef SDHTTPHeadersDictionary * _Nullable (^SDWebImageDownloaderHeadersFilterBlock)(NSURL * _Nullable url, SDHTTPHeadersDictionary * _Nullable headers);
+
+/**
+ *  A token associated with each download. Can be used to cancel a download
+ */
+@interface SDWebImageDownloadToken : NSObject <SDWebImageOperation>
+
+/**
+ The download's URL. This should be readonly and you should not modify
+ */
+@property (nonatomic, strong, nullable) NSURL *url;
+/**
+ The cancel token taken from `addHandlersForProgress:completed`. This should be readonly and you should not modify
+ @note use `-[SDWebImageDownloadToken cancel]` to cancel the token
+ */
+@property (nonatomic, strong, nullable) id downloadOperationCancelToken;
+
+@end
+
+
+/**
+ * Asynchronous downloader dedicated and optimized for image loading.
+ */
+@interface SDWebImageDownloader : NSObject
+
+/**
+ * Decompressing images that are downloaded and cached can improve performance but can consume lot of memory.
+ * Defaults to YES. Set this to NO if you are experiencing a crash due to excessive memory consumption.
+ */
+@property (assign, nonatomic) BOOL shouldDecompressImages;
+
+/**
+ *  The maximum number of concurrent downloads
+ */
+@property (assign, nonatomic) NSInteger maxConcurrentDownloads;
+
+/**
+ * Shows the current amount of downloads that still need to be downloaded
+ */
+@property (readonly, nonatomic) NSUInteger currentDownloadCount;
+
+/**
+ *  The timeout value (in seconds) for the download operation. Default: 15.0.
+ */
+@property (assign, nonatomic) NSTimeInterval downloadTimeout;
+
+/**
+ * The configuration in use by the internal NSURLSession.
+ * Mutating this object directly has no effect.
+ *
+ * @see createNewSessionWithConfiguration:
+ */
+@property (readonly, nonatomic, nonnull) NSURLSessionConfiguration *sessionConfiguration;
+
+
+/**
+ * Changes download operations execution order. Default value is `SDWebImageDownloaderFIFOExecutionOrder`.
+ */
+@property (assign, nonatomic) SDWebImageDownloaderExecutionOrder executionOrder;
+
+/**
+ *  Singleton method, returns the shared instance
+ *
+ *  @return global shared instance of downloader class
+ */
++ (nonnull instancetype)sharedDownloader;
+
+/**
+ *  Set the default URL credential to be set for request operations.
+ */
+@property (strong, nonatomic, nullable) NSURLCredential *urlCredential;
+
+/**
+ * Set username
+ */
+@property (strong, nonatomic, nullable) NSString *username;
+
+/**
+ * Set password
+ */
+@property (strong, nonatomic, nullable) NSString *password;
+
+/**
+ * Set filter to pick headers for downloading image HTTP request.
+ *
+ * This block will be invoked for each downloading image request, returned
+ * NSDictionary will be used as headers in corresponding HTTP request.
+ */
+@property (nonatomic, copy, nullable) SDWebImageDownloaderHeadersFilterBlock headersFilter;
+
+/**
+ * Creates an instance of a downloader with specified session configuration.
+ * @note `timeoutIntervalForRequest` is going to be overwritten.
+ * @return new instance of downloader class
+ */
+- (nonnull instancetype)initWithSessionConfiguration:(nullable NSURLSessionConfiguration *)sessionConfiguration NS_DESIGNATED_INITIALIZER;
+
+/**
+ * Set a value for a HTTP header to be appended to each download HTTP request.
+ *
+ * @param value The value for the header field. Use `nil` value to remove the header.
+ * @param field The name of the header field to set.
+ */
+- (void)setValue:(nullable NSString *)value forHTTPHeaderField:(nullable NSString *)field;
+
+/**
+ * Returns the value of the specified HTTP header field.
+ *
+ * @return The value associated with the header field field, or `nil` if there is no corresponding header field.
+ */
+- (nullable NSString *)valueForHTTPHeaderField:(nullable NSString *)field;
+
+/**
+ * Sets a subclass of `NSOperation` and conforms to `SDWebImageDownloaderOperationInterface`.
+ * Default is `SDWebImageDownloaderOperation`.
+ * Can be used each time SDWebImage constructs a request
+ * operation to download an image.
+ *
+ * @param operationClass The subclass of `NSOperation` and conforms to `SDWebImageDownloaderOperationInterface`.
+ * Default is `SDWebImageDownloaderOperation`, Passing `nil` will revert to `SDWebImageDownloaderOperation`.
+ */
+- (void)setOperationClass:(nullable Class)operationClass;
+
+/**
+ * Creates a SDWebImageDownloader async downloader instance with a given URL
+ *
+ * The delegate will be informed when the image is finish downloaded or an error has happen.
+ *
+ * @see SDWebImageDownloaderDelegate
+ *
+ * @param url            The URL to the image to download
+ * @param options        The options to be used for this download
+ * @param progressBlock  A block called repeatedly while the image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called once the download is completed.
+ *                       If the download succeeded, the image parameter is set, in case of error,
+ *                       error parameter is set with the error. The last parameter is always YES
+ *                       if SDWebImageDownloaderProgressiveDownload isn't use. With the
+ *                       SDWebImageDownloaderProgressiveDownload option, this block is called
+ *                       repeatedly with the partial image object and the finished argument set to NO
+ *                       before to be called a last time with the full image and finished argument
+ *                       set to YES. In case of error, the finished argument is always YES.
+ *
+ * @return A token (SDWebImageDownloadToken) that can be passed to -cancel: to cancel this operation
+ */
+- (nullable SDWebImageDownloadToken *)downloadImageWithURL:(nullable NSURL *)url
+                                                   options:(SDWebImageDownloaderOptions)options
+                                                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                                                 completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock;
+
+/**
+ * Cancels a download that was previously queued using -downloadImageWithURL:options:progress:completed:
+ *
+ * @param token The token received from -downloadImageWithURL:options:progress:completed: that should be canceled.
+ */
+- (void)cancel:(nullable SDWebImageDownloadToken *)token;
+
+/**
+ * Sets the download queue suspension state
+ */
+- (void)setSuspended:(BOOL)suspended;
+
+/**
+ * Cancels all download operations in the queue
+ */
+- (void)cancelAllDownloads;
+
+/**
+ * Forces SDWebImageDownloader to create and use a new NSURLSession that is
+ * initialized with the given configuration.
+ * @note All existing download operations in the queue will be cancelled.
+ * @note `timeoutIntervalForRequest` is going to be overwritten.
+ *
+ * @param sessionConfiguration The configuration to use for the new NSURLSession
+ */
+- (void)createNewSessionWithConfiguration:(nonnull NSURLSessionConfiguration *)sessionConfiguration;
+
+/**
+ * Invalidates the managed session, optionally canceling pending operations.
+ * @note If you use custom downloader instead of the shared downloader, you need call this method when you do not use it to avoid memory leak
+ * @param cancelPendingOperations Whether or not to cancel pending operations.
+ * @note Calling this method on the shared downloader has no effect.
+ */
+- (void)invalidateSessionAndCancel:(BOOL)cancelPendingOperations;
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageDownloader.m

@@ -0,0 +1,425 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageDownloader.h"
+#import "SDWebImageDownloaderOperation.h"
+
+#define LOCK(lock) dispatch_semaphore_wait(lock, DISPATCH_TIME_FOREVER);
+#define UNLOCK(lock) dispatch_semaphore_signal(lock);
+
+@interface SDWebImageDownloadToken ()
+
+@property (nonatomic, weak, nullable) NSOperation<SDWebImageDownloaderOperationInterface> *downloadOperation;
+
+@end
+
+@implementation SDWebImageDownloadToken
+
+- (void)cancel {
+    if (self.downloadOperation) {
+        SDWebImageDownloadToken *cancelToken = self.downloadOperationCancelToken;
+        if (cancelToken) {
+            [self.downloadOperation cancel:cancelToken];
+        }
+    }
+}
+
+@end
+
+
+@interface SDWebImageDownloader () <NSURLSessionTaskDelegate, NSURLSessionDataDelegate>
+
+@property (strong, nonatomic, nonnull) NSOperationQueue *downloadQueue;
+@property (weak, nonatomic, nullable) NSOperation *lastAddedOperation;
+@property (assign, nonatomic, nullable) Class operationClass;
+@property (strong, nonatomic, nonnull) NSMutableDictionary<NSURL *, NSOperation<SDWebImageDownloaderOperationInterface> *> *URLOperations;
+@property (strong, nonatomic, nullable) SDHTTPHeadersMutableDictionary *HTTPHeaders;
+@property (strong, nonatomic, nonnull) dispatch_semaphore_t operationsLock; // a lock to keep the access to `URLOperations` thread-safe
+@property (strong, nonatomic, nonnull) dispatch_semaphore_t headersLock; // a lock to keep the access to `HTTPHeaders` thread-safe
+
+// The session in which data tasks will run
+@property (strong, nonatomic) NSURLSession *session;
+
+@end
+
+@implementation SDWebImageDownloader
+
++ (void)initialize {
+    // Bind SDNetworkActivityIndicator if available (download it here: http://github.com/rs/SDNetworkActivityIndicator )
+    // To use it, just add #import "SDNetworkActivityIndicator.h" in addition to the SDWebImage import
+    if (NSClassFromString(@"SDNetworkActivityIndicator")) {
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
+        id activityIndicator = [NSClassFromString(@"SDNetworkActivityIndicator") performSelector:NSSelectorFromString(@"sharedActivityIndicator")];
+#pragma clang diagnostic pop
+
+        // Remove observer in case it was previously added.
+        [[NSNotificationCenter defaultCenter] removeObserver:activityIndicator name:SDWebImageDownloadStartNotification object:nil];
+        [[NSNotificationCenter defaultCenter] removeObserver:activityIndicator name:SDWebImageDownloadStopNotification object:nil];
+
+        [[NSNotificationCenter defaultCenter] addObserver:activityIndicator
+                                                 selector:NSSelectorFromString(@"startActivity")
+                                                     name:SDWebImageDownloadStartNotification object:nil];
+        [[NSNotificationCenter defaultCenter] addObserver:activityIndicator
+                                                 selector:NSSelectorFromString(@"stopActivity")
+                                                     name:SDWebImageDownloadStopNotification object:nil];
+    }
+}
+
++ (nonnull instancetype)sharedDownloader {
+    static dispatch_once_t once;
+    static id instance;
+    dispatch_once(&once, ^{
+        instance = [self new];
+    });
+    return instance;
+}
+
+- (nonnull instancetype)init {
+    return [self initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
+}
+
+- (nonnull instancetype)initWithSessionConfiguration:(nullable NSURLSessionConfiguration *)sessionConfiguration {
+    if ((self = [super init])) {
+        _operationClass = [SDWebImageDownloaderOperation class];
+        _shouldDecompressImages = YES;
+        _executionOrder = SDWebImageDownloaderFIFOExecutionOrder;
+        _downloadQueue = [NSOperationQueue new];
+        _downloadQueue.maxConcurrentOperationCount = 6;
+        _downloadQueue.name = @"com.hackemist.SDWebImageDownloader";
+        _URLOperations = [NSMutableDictionary new];
+        SDHTTPHeadersMutableDictionary *headerDictionary = [SDHTTPHeadersMutableDictionary dictionary];
+        NSString *userAgent = nil;
+#if SD_UIKIT
+        // User-Agent Header; see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.43
+        userAgent = [NSString stringWithFormat:@"%@/%@ (%@; iOS %@; Scale/%0.2f)", [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleExecutableKey] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleIdentifierKey], [[NSBundle mainBundle] infoDictionary][@"CFBundleShortVersionString"] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleVersionKey], [[UIDevice currentDevice] model], [[UIDevice currentDevice] systemVersion], [[UIScreen mainScreen] scale]];
+#elif SD_WATCH
+        // User-Agent Header; see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.43
+        userAgent = [NSString stringWithFormat:@"%@/%@ (%@; watchOS %@; Scale/%0.2f)", [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleExecutableKey] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleIdentifierKey], [[NSBundle mainBundle] infoDictionary][@"CFBundleShortVersionString"] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleVersionKey], [[WKInterfaceDevice currentDevice] model], [[WKInterfaceDevice currentDevice] systemVersion], [[WKInterfaceDevice currentDevice] screenScale]];
+#elif SD_MAC
+        userAgent = [NSString stringWithFormat:@"%@/%@ (Mac OS X %@)", [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleExecutableKey] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleIdentifierKey], [[NSBundle mainBundle] infoDictionary][@"CFBundleShortVersionString"] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleVersionKey], [[NSProcessInfo processInfo] operatingSystemVersionString]];
+#endif
+        if (userAgent) {
+            if (![userAgent canBeConvertedToEncoding:NSASCIIStringEncoding]) {
+                NSMutableString *mutableUserAgent = [userAgent mutableCopy];
+                if (CFStringTransform((__bridge CFMutableStringRef)(mutableUserAgent), NULL, (__bridge CFStringRef)@"Any-Latin; Latin-ASCII; [:^ASCII:] Remove", false)) {
+                    userAgent = mutableUserAgent;
+                }
+            }
+            headerDictionary[@"User-Agent"] = userAgent;
+        }
+#ifdef SD_WEBP
+        headerDictionary[@"Accept"] = @"image/webp,image/*;q=0.8";
+#else
+        headerDictionary[@"Accept"] = @"image/*;q=0.8";
+#endif
+        _HTTPHeaders = headerDictionary;
+        _operationsLock = dispatch_semaphore_create(1);
+        _headersLock = dispatch_semaphore_create(1);
+        _downloadTimeout = 15.0;
+
+        [self createNewSessionWithConfiguration:sessionConfiguration];
+    }
+    return self;
+}
+
+- (void)createNewSessionWithConfiguration:(NSURLSessionConfiguration *)sessionConfiguration {
+    [self cancelAllDownloads];
+
+    if (self.session) {
+        [self.session invalidateAndCancel];
+    }
+
+    sessionConfiguration.timeoutIntervalForRequest = self.downloadTimeout;
+
+    /**
+     *  Create the session for this task
+     *  We send nil as delegate queue so that the session creates a serial operation queue for performing all delegate
+     *  method calls and completion handler calls.
+     */
+    self.session = [NSURLSession sessionWithConfiguration:sessionConfiguration
+                                                 delegate:self
+                                            delegateQueue:nil];
+}
+
+- (void)invalidateSessionAndCancel:(BOOL)cancelPendingOperations {
+    if (self == [SDWebImageDownloader sharedDownloader]) {
+        return;
+    }
+    if (cancelPendingOperations) {
+        [self.session invalidateAndCancel];
+    } else {
+        [self.session finishTasksAndInvalidate];
+    }
+}
+
+- (void)dealloc {
+    [self.session invalidateAndCancel];
+    self.session = nil;
+
+    [self.downloadQueue cancelAllOperations];
+}
+
+- (void)setValue:(nullable NSString *)value forHTTPHeaderField:(nullable NSString *)field {
+    LOCK(self.headersLock);
+    if (value) {
+        self.HTTPHeaders[field] = value;
+    } else {
+        [self.HTTPHeaders removeObjectForKey:field];
+    }
+    UNLOCK(self.headersLock);
+}
+
+- (nullable NSString *)valueForHTTPHeaderField:(nullable NSString *)field {
+    if (!field) {
+        return nil;
+    }
+    return [[self allHTTPHeaderFields] objectForKey:field];
+}
+
+- (nonnull SDHTTPHeadersDictionary *)allHTTPHeaderFields {
+    LOCK(self.headersLock);
+    SDHTTPHeadersDictionary *allHTTPHeaderFields = [self.HTTPHeaders copy];
+    UNLOCK(self.headersLock);
+    return allHTTPHeaderFields;
+}
+
+- (void)setMaxConcurrentDownloads:(NSInteger)maxConcurrentDownloads {
+    _downloadQueue.maxConcurrentOperationCount = maxConcurrentDownloads;
+}
+
+- (NSUInteger)currentDownloadCount {
+    return _downloadQueue.operationCount;
+}
+
+- (NSInteger)maxConcurrentDownloads {
+    return _downloadQueue.maxConcurrentOperationCount;
+}
+
+- (NSURLSessionConfiguration *)sessionConfiguration {
+    return self.session.configuration;
+}
+
+- (void)setOperationClass:(nullable Class)operationClass {
+    if (operationClass && [operationClass isSubclassOfClass:[NSOperation class]] && [operationClass conformsToProtocol:@protocol(SDWebImageDownloaderOperationInterface)]) {
+        _operationClass = operationClass;
+    } else {
+        _operationClass = [SDWebImageDownloaderOperation class];
+    }
+}
+
+- (NSOperation<SDWebImageDownloaderOperationInterface> *)createDownloaderOperationWithUrl:(nullable NSURL *)url
+                                                                                  options:(SDWebImageDownloaderOptions)options {
+    NSTimeInterval timeoutInterval = self.downloadTimeout;
+    if (timeoutInterval == 0.0) {
+        timeoutInterval = 15.0;
+    }
+
+    // In order to prevent from potential duplicate caching (NSURLCache + SDImageCache) we disable the cache for image requests if told otherwise
+    NSURLRequestCachePolicy cachePolicy = options & SDWebImageDownloaderUseNSURLCache ? NSURLRequestUseProtocolCachePolicy : NSURLRequestReloadIgnoringLocalCacheData;
+    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url
+                                                                cachePolicy:cachePolicy
+                                                            timeoutInterval:timeoutInterval];
+    
+    request.HTTPShouldHandleCookies = (options & SDWebImageDownloaderHandleCookies);
+    request.HTTPShouldUsePipelining = YES;
+    if (self.headersFilter) {
+        request.allHTTPHeaderFields = self.headersFilter(url, [self allHTTPHeaderFields]);
+    }
+    else {
+        request.allHTTPHeaderFields = [self allHTTPHeaderFields];
+    }
+    NSOperation<SDWebImageDownloaderOperationInterface> *operation = [[self.operationClass alloc] initWithRequest:request inSession:self.session options:options];
+    operation.shouldDecompressImages = self.shouldDecompressImages;
+    
+    if (self.urlCredential) {
+        operation.credential = self.urlCredential;
+    } else if (self.username && self.password) {
+        operation.credential = [NSURLCredential credentialWithUser:self.username password:self.password persistence:NSURLCredentialPersistenceForSession];
+    }
+    
+    if (options & SDWebImageDownloaderHighPriority) {
+        operation.queuePriority = NSOperationQueuePriorityHigh;
+    } else if (options & SDWebImageDownloaderLowPriority) {
+        operation.queuePriority = NSOperationQueuePriorityLow;
+    }
+    
+    if (self.executionOrder == SDWebImageDownloaderLIFOExecutionOrder) {
+        // Emulate LIFO execution order by systematically adding new operations as last operation's dependency
+        [self.lastAddedOperation addDependency:operation];
+        self.lastAddedOperation = operation;
+    }
+
+    return operation;
+}
+
+- (void)cancel:(nullable SDWebImageDownloadToken *)token {
+    NSURL *url = token.url;
+    if (!url) {
+        return;
+    }
+    LOCK(self.operationsLock);
+    NSOperation<SDWebImageDownloaderOperationInterface> *operation = [self.URLOperations objectForKey:url];
+    if (operation) {
+        BOOL canceled = [operation cancel:token.downloadOperationCancelToken];
+        if (canceled) {
+            [self.URLOperations removeObjectForKey:url];
+        }
+    }
+    UNLOCK(self.operationsLock);
+}
+
+- (nullable SDWebImageDownloadToken *)downloadImageWithURL:(nullable NSURL *)url
+                                                   options:(SDWebImageDownloaderOptions)options
+                                                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                                                 completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock {
+    // The URL will be used as the key to the callbacks dictionary so it cannot be nil. If it is nil immediately call the completed block with no image or data.
+    if (url == nil) {
+        if (completedBlock != nil) {
+            completedBlock(nil, nil, nil, NO);
+        }
+        return nil;
+    }
+    
+    LOCK(self.operationsLock);
+    NSOperation<SDWebImageDownloaderOperationInterface> *operation = [self.URLOperations objectForKey:url];
+    // There is a case that the operation may be marked as finished, but not been removed from `self.URLOperations`.
+    if (!operation || operation.isFinished) {
+        operation = [self createDownloaderOperationWithUrl:url options:options];
+        __weak typeof(self) wself = self;
+        operation.completionBlock = ^{
+            __strong typeof(wself) sself = wself;
+            if (!sself) {
+                return;
+            }
+            LOCK(sself.operationsLock);
+            [sself.URLOperations removeObjectForKey:url];
+            UNLOCK(sself.operationsLock);
+        };
+        [self.URLOperations setObject:operation forKey:url];
+        // Add operation to operation queue only after all configuration done according to Apple's doc.
+        // `addOperation:` does not synchronously execute the `operation.completionBlock` so this will not cause deadlock.
+        [self.downloadQueue addOperation:operation];
+    }
+    UNLOCK(self.operationsLock);
+
+    id downloadOperationCancelToken = [operation addHandlersForProgress:progressBlock completed:completedBlock];
+    
+    SDWebImageDownloadToken *token = [SDWebImageDownloadToken new];
+    token.downloadOperation = operation;
+    token.url = url;
+    token.downloadOperationCancelToken = downloadOperationCancelToken;
+
+    return token;
+}
+
+- (void)setSuspended:(BOOL)suspended {
+    self.downloadQueue.suspended = suspended;
+}
+
+- (void)cancelAllDownloads {
+    [self.downloadQueue cancelAllOperations];
+}
+
+#pragma mark Helper methods
+
+- (NSOperation<SDWebImageDownloaderOperationInterface> *)operationWithTask:(NSURLSessionTask *)task {
+    NSOperation<SDWebImageDownloaderOperationInterface> *returnOperation = nil;
+    for (NSOperation<SDWebImageDownloaderOperationInterface> *operation in self.downloadQueue.operations) {
+        if ([operation respondsToSelector:@selector(dataTask)]) {
+            if (operation.dataTask.taskIdentifier == task.taskIdentifier) {
+                returnOperation = operation;
+                break;
+            }
+        }
+    }
+    return returnOperation;
+}
+
+#pragma mark NSURLSessionDataDelegate
+
+- (void)URLSession:(NSURLSession *)session
+          dataTask:(NSURLSessionDataTask *)dataTask
+didReceiveResponse:(NSURLResponse *)response
+ completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler {
+
+    // Identify the operation that runs this task and pass it the delegate method
+    NSOperation<SDWebImageDownloaderOperationInterface> *dataOperation = [self operationWithTask:dataTask];
+    if ([dataOperation respondsToSelector:@selector(URLSession:dataTask:didReceiveResponse:completionHandler:)]) {
+        [dataOperation URLSession:session dataTask:dataTask didReceiveResponse:response completionHandler:completionHandler];
+    } else {
+        if (completionHandler) {
+            completionHandler(NSURLSessionResponseAllow);
+        }
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {
+
+    // Identify the operation that runs this task and pass it the delegate method
+    NSOperation<SDWebImageDownloaderOperationInterface> *dataOperation = [self operationWithTask:dataTask];
+    if ([dataOperation respondsToSelector:@selector(URLSession:dataTask:didReceiveData:)]) {
+        [dataOperation URLSession:session dataTask:dataTask didReceiveData:data];
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session
+          dataTask:(NSURLSessionDataTask *)dataTask
+ willCacheResponse:(NSCachedURLResponse *)proposedResponse
+ completionHandler:(void (^)(NSCachedURLResponse *cachedResponse))completionHandler {
+
+    // Identify the operation that runs this task and pass it the delegate method
+    NSOperation<SDWebImageDownloaderOperationInterface> *dataOperation = [self operationWithTask:dataTask];
+    if ([dataOperation respondsToSelector:@selector(URLSession:dataTask:willCacheResponse:completionHandler:)]) {
+        [dataOperation URLSession:session dataTask:dataTask willCacheResponse:proposedResponse completionHandler:completionHandler];
+    } else {
+        if (completionHandler) {
+            completionHandler(proposedResponse);
+        }
+    }
+}
+
+#pragma mark NSURLSessionTaskDelegate
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {
+    
+    // Identify the operation that runs this task and pass it the delegate method
+    NSOperation<SDWebImageDownloaderOperationInterface> *dataOperation = [self operationWithTask:task];
+    if ([dataOperation respondsToSelector:@selector(URLSession:task:didCompleteWithError:)]) {
+        [dataOperation URLSession:session task:task didCompleteWithError:error];
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task willPerformHTTPRedirection:(NSHTTPURLResponse *)response newRequest:(NSURLRequest *)request completionHandler:(void (^)(NSURLRequest * _Nullable))completionHandler {
+    
+    // Identify the operation that runs this task and pass it the delegate method
+    NSOperation<SDWebImageDownloaderOperationInterface> *dataOperation = [self operationWithTask:task];
+    if ([dataOperation respondsToSelector:@selector(URLSession:task:willPerformHTTPRedirection:newRequest:completionHandler:)]) {
+        [dataOperation URLSession:session task:task willPerformHTTPRedirection:response newRequest:request completionHandler:completionHandler];
+    } else {
+        if (completionHandler) {
+            completionHandler(request);
+        }
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler {
+
+    // Identify the operation that runs this task and pass it the delegate method
+    NSOperation<SDWebImageDownloaderOperationInterface> *dataOperation = [self operationWithTask:task];
+    if ([dataOperation respondsToSelector:@selector(URLSession:task:didReceiveChallenge:completionHandler:)]) {
+        [dataOperation URLSession:session task:task didReceiveChallenge:challenge completionHandler:completionHandler];
+    } else {
+        if (completionHandler) {
+            completionHandler(NSURLSessionAuthChallengePerformDefaultHandling, nil);
+        }
+    }
+}
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageDownloaderOperation.h

@@ -0,0 +1,128 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageDownloader.h"
+#import "SDWebImageOperation.h"
+
+FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageDownloadStartNotification;
+FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageDownloadReceiveResponseNotification;
+FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageDownloadStopNotification;
+FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageDownloadFinishNotification;
+
+
+
+/**
+ Describes a downloader operation. If one wants to use a custom downloader op, it needs to inherit from `NSOperation` and conform to this protocol
+ For the description about these methods, see `SDWebImageDownloaderOperation`
+ */
+@protocol SDWebImageDownloaderOperationInterface <NSURLSessionTaskDelegate, NSURLSessionDataDelegate>
+@required
+- (nonnull instancetype)initWithRequest:(nullable NSURLRequest *)request
+                              inSession:(nullable NSURLSession *)session
+                                options:(SDWebImageDownloaderOptions)options;
+
+- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock;
+
+- (BOOL)shouldDecompressImages;
+- (void)setShouldDecompressImages:(BOOL)value;
+
+- (nullable NSURLCredential *)credential;
+- (void)setCredential:(nullable NSURLCredential *)value;
+
+- (BOOL)cancel:(nullable id)token;
+
+@optional
+- (nullable NSURLSessionTask *)dataTask;
+
+@end
+
+
+@interface SDWebImageDownloaderOperation : NSOperation <SDWebImageDownloaderOperationInterface, SDWebImageOperation>
+
+/**
+ * The request used by the operation's task.
+ */
+@property (strong, nonatomic, readonly, nullable) NSURLRequest *request;
+
+/**
+ * The operation's task
+ */
+@property (strong, nonatomic, readonly, nullable) NSURLSessionTask *dataTask;
+
+
+@property (assign, nonatomic) BOOL shouldDecompressImages;
+
+/**
+ *  Was used to determine whether the URL connection should consult the credential storage for authenticating the connection.
+ *  @deprecated Not used for a couple of versions
+ */
+@property (nonatomic, assign) BOOL shouldUseCredentialStorage __deprecated_msg("Property deprecated. Does nothing. Kept only for backwards compatibility");
+
+/**
+ * The credential used for authentication challenges in `-URLSession:task:didReceiveChallenge:completionHandler:`.
+ *
+ * This will be overridden by any shared credentials that exist for the username or password of the request URL, if present.
+ */
+@property (nonatomic, strong, nullable) NSURLCredential *credential;
+
+/**
+ * The SDWebImageDownloaderOptions for the receiver.
+ */
+@property (assign, nonatomic, readonly) SDWebImageDownloaderOptions options;
+
+/**
+ * The expected size of data.
+ */
+@property (assign, nonatomic) NSInteger expectedSize;
+
+/**
+ * The response returned by the operation's task.
+ */
+@property (strong, nonatomic, nullable) NSURLResponse *response;
+
+/**
+ *  Initializes a `SDWebImageDownloaderOperation` object
+ *
+ *  @see SDWebImageDownloaderOperation
+ *
+ *  @param request        the URL request
+ *  @param session        the URL session in which this operation will run
+ *  @param options        downloader options
+ *
+ *  @return the initialized instance
+ */
+- (nonnull instancetype)initWithRequest:(nullable NSURLRequest *)request
+                              inSession:(nullable NSURLSession *)session
+                                options:(SDWebImageDownloaderOptions)options NS_DESIGNATED_INITIALIZER;
+
+/**
+ *  Adds handlers for progress and completion. Returns a tokent that can be passed to -cancel: to cancel this set of
+ *  callbacks.
+ *
+ *  @param progressBlock  the block executed when a new chunk of data arrives.
+ *                        @note the progress block is executed on a background queue
+ *  @param completedBlock the block executed when the download is done.
+ *                        @note the completed block is executed on the main queue for success. If errors are found, there is a chance the block will be executed on a background queue
+ *
+ *  @return the token to use to cancel this set of handlers
+ */
+- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock;
+
+/**
+ *  Cancels a set of callbacks. Once all callbacks are canceled, the operation is cancelled.
+ *
+ *  @param token the token representing a set of callbacks to cancel
+ *
+ *  @return YES if the operation was stopped because this was the last token to be canceled. NO otherwise.
+ */
+- (BOOL)cancel:(nullable id)token;
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageDownloaderOperation.m

@@ -0,0 +1,520 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageDownloaderOperation.h"
+#import "SDWebImageManager.h"
+#import "NSImage+WebCache.h"
+#import "SDWebImageCodersManager.h"
+
+#define LOCK(lock) dispatch_semaphore_wait(lock, DISPATCH_TIME_FOREVER);
+#define UNLOCK(lock) dispatch_semaphore_signal(lock);
+
+// iOS 8 Foundation.framework extern these symbol but the define is in CFNetwork.framework. We just fix this without import CFNetwork.framework
+#if (__IPHONE_OS_VERSION_MIN_REQUIRED && __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_9_0)
+const float NSURLSessionTaskPriorityHigh = 0.75;
+const float NSURLSessionTaskPriorityDefault = 0.5;
+const float NSURLSessionTaskPriorityLow = 0.25;
+#endif
+
+NSString *const SDWebImageDownloadStartNotification = @"SDWebImageDownloadStartNotification";
+NSString *const SDWebImageDownloadReceiveResponseNotification = @"SDWebImageDownloadReceiveResponseNotification";
+NSString *const SDWebImageDownloadStopNotification = @"SDWebImageDownloadStopNotification";
+NSString *const SDWebImageDownloadFinishNotification = @"SDWebImageDownloadFinishNotification";
+
+static NSString *const kProgressCallbackKey = @"progress";
+static NSString *const kCompletedCallbackKey = @"completed";
+
+typedef NSMutableDictionary<NSString *, id> SDCallbacksDictionary;
+
+@interface SDWebImageDownloaderOperation ()
+
+@property (strong, nonatomic, nonnull) NSMutableArray<SDCallbacksDictionary *> *callbackBlocks;
+
+@property (assign, nonatomic, getter = isExecuting) BOOL executing;
+@property (assign, nonatomic, getter = isFinished) BOOL finished;
+@property (strong, nonatomic, nullable) NSMutableData *imageData;
+@property (copy, nonatomic, nullable) NSData *cachedData; // for `SDWebImageDownloaderIgnoreCachedResponse`
+
+// This is weak because it is injected by whoever manages this session. If this gets nil-ed out, we won't be able to run
+// the task associated with this operation
+@property (weak, nonatomic, nullable) NSURLSession *unownedSession;
+// This is set if we're using not using an injected NSURLSession. We're responsible of invalidating this one
+@property (strong, nonatomic, nullable) NSURLSession *ownedSession;
+
+@property (strong, nonatomic, readwrite, nullable) NSURLSessionTask *dataTask;
+
+@property (strong, nonatomic, nonnull) dispatch_semaphore_t callbacksLock; // a lock to keep the access to `callbackBlocks` thread-safe
+
+@property (strong, nonatomic, nonnull) dispatch_queue_t coderQueue; // the queue to do image decoding
+#if SD_UIKIT
+@property (assign, nonatomic) UIBackgroundTaskIdentifier backgroundTaskId;
+#endif
+
+@property (strong, nonatomic, nullable) id<SDWebImageProgressiveCoder> progressiveCoder;
+
+@end
+
+@implementation SDWebImageDownloaderOperation
+
+@synthesize executing = _executing;
+@synthesize finished = _finished;
+
+- (nonnull instancetype)init {
+    return [self initWithRequest:nil inSession:nil options:0];
+}
+
+- (nonnull instancetype)initWithRequest:(nullable NSURLRequest *)request
+                              inSession:(nullable NSURLSession *)session
+                                options:(SDWebImageDownloaderOptions)options {
+    if ((self = [super init])) {
+        _request = [request copy];
+        _shouldDecompressImages = YES;
+        _options = options;
+        _callbackBlocks = [NSMutableArray new];
+        _executing = NO;
+        _finished = NO;
+        _expectedSize = 0;
+        _unownedSession = session;
+        _callbacksLock = dispatch_semaphore_create(1);
+        _coderQueue = dispatch_queue_create("com.hackemist.SDWebImageDownloaderOperationCoderQueue", DISPATCH_QUEUE_SERIAL);
+    }
+    return self;
+}
+
+- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                            completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock {
+    SDCallbacksDictionary *callbacks = [NSMutableDictionary new];
+    if (progressBlock) callbacks[kProgressCallbackKey] = [progressBlock copy];
+    if (completedBlock) callbacks[kCompletedCallbackKey] = [completedBlock copy];
+    LOCK(self.callbacksLock);
+    [self.callbackBlocks addObject:callbacks];
+    UNLOCK(self.callbacksLock);
+    return callbacks;
+}
+
+- (nullable NSArray<id> *)callbacksForKey:(NSString *)key {
+    LOCK(self.callbacksLock);
+    NSMutableArray<id> *callbacks = [[self.callbackBlocks valueForKey:key] mutableCopy];
+    UNLOCK(self.callbacksLock);
+    // We need to remove [NSNull null] because there might not always be a progress block for each callback
+    [callbacks removeObjectIdenticalTo:[NSNull null]];
+    return [callbacks copy]; // strip mutability here
+}
+
+- (BOOL)cancel:(nullable id)token {
+    BOOL shouldCancel = NO;
+    LOCK(self.callbacksLock);
+    [self.callbackBlocks removeObjectIdenticalTo:token];
+    if (self.callbackBlocks.count == 0) {
+        shouldCancel = YES;
+    }
+    UNLOCK(self.callbacksLock);
+    if (shouldCancel) {
+        [self cancel];
+    }
+    return shouldCancel;
+}
+
+- (void)start {
+    @synchronized (self) {
+        if (self.isCancelled) {
+            self.finished = YES;
+            [self reset];
+            return;
+        }
+
+#if SD_UIKIT
+        Class UIApplicationClass = NSClassFromString(@"UIApplication");
+        BOOL hasApplication = UIApplicationClass && [UIApplicationClass respondsToSelector:@selector(sharedApplication)];
+        if (hasApplication && [self shouldContinueWhenAppEntersBackground]) {
+            __weak __typeof__ (self) wself = self;
+            UIApplication * app = [UIApplicationClass performSelector:@selector(sharedApplication)];
+            self.backgroundTaskId = [app beginBackgroundTaskWithExpirationHandler:^{
+                __strong __typeof (wself) sself = wself;
+
+                if (sself) {
+                    [sself cancel];
+
+                    [app endBackgroundTask:sself.backgroundTaskId];
+                    sself.backgroundTaskId = UIBackgroundTaskInvalid;
+                }
+            }];
+        }
+#endif
+        NSURLSession *session = self.unownedSession;
+        if (!session) {
+            NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration];
+            sessionConfig.timeoutIntervalForRequest = 15;
+            
+            /**
+             *  Create the session for this task
+             *  We send nil as delegate queue so that the session creates a serial operation queue for performing all delegate
+             *  method calls and completion handler calls.
+             */
+            session = [NSURLSession sessionWithConfiguration:sessionConfig
+                                                    delegate:self
+                                               delegateQueue:nil];
+            self.ownedSession = session;
+        }
+        
+        if (self.options & SDWebImageDownloaderIgnoreCachedResponse) {
+            // Grab the cached data for later check
+            NSURLCache *URLCache = session.configuration.URLCache;
+            if (!URLCache) {
+                URLCache = [NSURLCache sharedURLCache];
+            }
+            NSCachedURLResponse *cachedResponse;
+            // NSURLCache's `cachedResponseForRequest:` is not thread-safe, see https://developer.apple.com/documentation/foundation/nsurlcache#2317483
+            @synchronized (URLCache) {
+                cachedResponse = [URLCache cachedResponseForRequest:self.request];
+            }
+            if (cachedResponse) {
+                self.cachedData = cachedResponse.data;
+            }
+        }
+        
+        self.dataTask = [session dataTaskWithRequest:self.request];
+        self.executing = YES;
+    }
+
+    if (self.dataTask) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunguarded-availability"
+        if ([self.dataTask respondsToSelector:@selector(setPriority:)]) {
+            if (self.options & SDWebImageDownloaderHighPriority) {
+                self.dataTask.priority = NSURLSessionTaskPriorityHigh;
+            } else if (self.options & SDWebImageDownloaderLowPriority) {
+                self.dataTask.priority = NSURLSessionTaskPriorityLow;
+            }
+        }
+#pragma clang diagnostic pop
+        [self.dataTask resume];
+        for (SDWebImageDownloaderProgressBlock progressBlock in [self callbacksForKey:kProgressCallbackKey]) {
+            progressBlock(0, NSURLResponseUnknownLength, self.request.URL);
+        }
+        __weak typeof(self) weakSelf = self;
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStartNotification object:weakSelf];
+        });
+    } else {
+        [self callCompletionBlocksWithError:[NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorUnknown userInfo:@{NSLocalizedDescriptionKey : @"Task can't be initialized"}]];
+        [self done];
+        return;
+    }
+
+#if SD_UIKIT
+    Class UIApplicationClass = NSClassFromString(@"UIApplication");
+    if(!UIApplicationClass || ![UIApplicationClass respondsToSelector:@selector(sharedApplication)]) {
+        return;
+    }
+    if (self.backgroundTaskId != UIBackgroundTaskInvalid) {
+        UIApplication * app = [UIApplication performSelector:@selector(sharedApplication)];
+        [app endBackgroundTask:self.backgroundTaskId];
+        self.backgroundTaskId = UIBackgroundTaskInvalid;
+    }
+#endif
+}
+
+- (void)cancel {
+    @synchronized (self) {
+        [self cancelInternal];
+    }
+}
+
+- (void)cancelInternal {
+    if (self.isFinished) return;
+    [super cancel];
+
+    if (self.dataTask) {
+        [self.dataTask cancel];
+        __weak typeof(self) weakSelf = self;
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:weakSelf];
+        });
+
+        // As we cancelled the task, its callback won't be called and thus won't
+        // maintain the isFinished and isExecuting flags.
+        if (self.isExecuting) self.executing = NO;
+        if (!self.isFinished) self.finished = YES;
+    }
+
+    [self reset];
+}
+
+- (void)done {
+    self.finished = YES;
+    self.executing = NO;
+    [self reset];
+}
+
+- (void)reset {
+    LOCK(self.callbacksLock);
+    [self.callbackBlocks removeAllObjects];
+    UNLOCK(self.callbacksLock);
+    self.dataTask = nil;
+    
+    if (self.ownedSession) {
+        [self.ownedSession invalidateAndCancel];
+        self.ownedSession = nil;
+    }
+}
+
+- (void)setFinished:(BOOL)finished {
+    [self willChangeValueForKey:@"isFinished"];
+    _finished = finished;
+    [self didChangeValueForKey:@"isFinished"];
+}
+
+- (void)setExecuting:(BOOL)executing {
+    [self willChangeValueForKey:@"isExecuting"];
+    _executing = executing;
+    [self didChangeValueForKey:@"isExecuting"];
+}
+
+- (BOOL)isConcurrent {
+    return YES;
+}
+
+#pragma mark NSURLSessionDataDelegate
+
+- (void)URLSession:(NSURLSession *)session
+          dataTask:(NSURLSessionDataTask *)dataTask
+didReceiveResponse:(NSURLResponse *)response
+ completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler {
+    NSURLSessionResponseDisposition disposition = NSURLSessionResponseAllow;
+    NSInteger expected = (NSInteger)response.expectedContentLength;
+    expected = expected > 0 ? expected : 0;
+    self.expectedSize = expected;
+    self.response = response;
+    NSInteger statusCode = [response respondsToSelector:@selector(statusCode)] ? ((NSHTTPURLResponse *)response).statusCode : 200;
+    BOOL valid = statusCode < 400;
+    //'304 Not Modified' is an exceptional one. It should be treated as cancelled if no cache data
+    //URLSession current behavior will return 200 status code when the server respond 304 and URLCache hit. But this is not a standard behavior and we just add a check
+    if (statusCode == 304 && !self.cachedData) {
+        valid = NO;
+    }
+    
+    if (valid) {
+        for (SDWebImageDownloaderProgressBlock progressBlock in [self callbacksForKey:kProgressCallbackKey]) {
+            progressBlock(0, expected, self.request.URL);
+        }
+    } else {
+        // Status code invalid and marked as cancelled. Do not call `[self.dataTask cancel]` which may mass up URLSession life cycle
+        disposition = NSURLSessionResponseCancel;
+    }
+    
+    __weak typeof(self) weakSelf = self;
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadReceiveResponseNotification object:weakSelf];
+    });
+    
+    if (completionHandler) {
+        completionHandler(disposition);
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {
+    if (!self.imageData) {
+        self.imageData = [[NSMutableData alloc] initWithCapacity:self.expectedSize];
+    }
+    [self.imageData appendData:data];
+
+    if ((self.options & SDWebImageDownloaderProgressiveDownload) && self.expectedSize > 0) {
+        // Get the image data
+        __block NSData *imageData = [self.imageData copy];
+        // Get the total bytes downloaded
+        const NSInteger totalSize = imageData.length;
+        // Get the finish status
+        BOOL finished = (totalSize >= self.expectedSize);
+        
+        if (!self.progressiveCoder) {
+            // We need to create a new instance for progressive decoding to avoid conflicts
+            for (id<SDWebImageCoder>coder in [SDWebImageCodersManager sharedInstance].coders) {
+                if ([coder conformsToProtocol:@protocol(SDWebImageProgressiveCoder)] &&
+                    [((id<SDWebImageProgressiveCoder>)coder) canIncrementallyDecodeFromData:imageData]) {
+                    self.progressiveCoder = [[[coder class] alloc] init];
+                    break;
+                }
+            }
+        }
+        
+        // progressive decode the image in coder queue
+        dispatch_async(self.coderQueue, ^{
+            @autoreleasepool {
+                UIImage *image = [self.progressiveCoder incrementallyDecodedImageWithData:imageData finished:finished];
+                if (image) {
+                    NSString *key = [[SDWebImageManager sharedManager] cacheKeyForURL:self.request.URL];
+                    image = [self scaledImageForKey:key image:image];
+                    if (self.shouldDecompressImages) {
+                        image = [[SDWebImageCodersManager sharedInstance] decompressedImageWithImage:image data:&imageData options:@{SDWebImageCoderScaleDownLargeImagesKey: @(NO)}];
+                    }
+                    
+                    // We do not keep the progressive decoding image even when `finished`=YES. Because they are for view rendering but not take full function from downloader options. And some coders implementation may not keep consistent between progressive decoding and normal decoding.
+                    
+                    [self callCompletionBlocksWithImage:image imageData:nil error:nil finished:NO];
+                }
+            }
+        });
+    }
+
+    for (SDWebImageDownloaderProgressBlock progressBlock in [self callbacksForKey:kProgressCallbackKey]) {
+        progressBlock(self.imageData.length, self.expectedSize, self.request.URL);
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session
+          dataTask:(NSURLSessionDataTask *)dataTask
+ willCacheResponse:(NSCachedURLResponse *)proposedResponse
+ completionHandler:(void (^)(NSCachedURLResponse *cachedResponse))completionHandler {
+    
+    NSCachedURLResponse *cachedResponse = proposedResponse;
+
+    if (!(self.options & SDWebImageDownloaderUseNSURLCache)) {
+        // Prevents caching of responses
+        cachedResponse = nil;
+    }
+    if (completionHandler) {
+        completionHandler(cachedResponse);
+    }
+}
+
+#pragma mark NSURLSessionTaskDelegate
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {
+    @synchronized(self) {
+        self.dataTask = nil;
+        __weak typeof(self) weakSelf = self;
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:weakSelf];
+            if (!error) {
+                [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadFinishNotification object:weakSelf];
+            }
+        });
+    }
+    
+    // make sure to call `[self done]` to mark operation as finished
+    if (error) {
+        [self callCompletionBlocksWithError:error];
+        [self done];
+    } else {
+        if ([self callbacksForKey:kCompletedCallbackKey].count > 0) {
+            /**
+             *  If you specified to use `NSURLCache`, then the response you get here is what you need.
+             */
+            __block NSData *imageData = [self.imageData copy];
+            if (imageData) {
+                /**  if you specified to only use cached data via `SDWebImageDownloaderIgnoreCachedResponse`,
+                 *  then we should check if the cached data is equal to image data
+                 */
+                if (self.options & SDWebImageDownloaderIgnoreCachedResponse && [self.cachedData isEqualToData:imageData]) {
+                    // call completion block with nil
+                    [self callCompletionBlocksWithImage:nil imageData:nil error:nil finished:YES];
+                    [self done];
+                } else {
+                    // decode the image in coder queue
+                    dispatch_async(self.coderQueue, ^{
+                        @autoreleasepool {
+                            UIImage *image = [[SDWebImageCodersManager sharedInstance] decodedImageWithData:imageData];
+                            NSString *key = [[SDWebImageManager sharedManager] cacheKeyForURL:self.request.URL];
+                            image = [self scaledImageForKey:key image:image];
+                            
+                            BOOL shouldDecode = YES;
+                            // Do not force decoding animated GIFs and WebPs
+                            if (image.images) {
+                                shouldDecode = NO;
+                            } else {
+#ifdef SD_WEBP
+                                SDImageFormat imageFormat = [NSData sd_imageFormatForImageData:imageData];
+                                if (imageFormat == SDImageFormatWebP) {
+                                    shouldDecode = NO;
+                                }
+#endif
+                            }
+                            
+                            if (shouldDecode) {
+                                if (self.shouldDecompressImages) {
+                                    BOOL shouldScaleDown = self.options & SDWebImageDownloaderScaleDownLargeImages;
+                                    image = [[SDWebImageCodersManager sharedInstance] decompressedImageWithImage:image data:&imageData options:@{SDWebImageCoderScaleDownLargeImagesKey: @(shouldScaleDown)}];
+                                }
+                            }
+                            CGSize imageSize = image.size;
+                            if (imageSize.width == 0 || imageSize.height == 0) {
+                                [self callCompletionBlocksWithError:[NSError errorWithDomain:SDWebImageErrorDomain code:0 userInfo:@{NSLocalizedDescriptionKey : @"Downloaded image has 0 pixels"}]];
+                            } else {
+                                [self callCompletionBlocksWithImage:image imageData:imageData error:nil finished:YES];
+                            }
+                            [self done];
+                        }
+                    });
+                }
+            } else {
+                [self callCompletionBlocksWithError:[NSError errorWithDomain:SDWebImageErrorDomain code:0 userInfo:@{NSLocalizedDescriptionKey : @"Image data is nil"}]];
+                [self done];
+            }
+        } else {
+            [self done];
+        }
+    }
+}
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler {
+    
+    NSURLSessionAuthChallengeDisposition disposition = NSURLSessionAuthChallengePerformDefaultHandling;
+    __block NSURLCredential *credential = nil;
+    
+    if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
+        if (!(self.options & SDWebImageDownloaderAllowInvalidSSLCertificates)) {
+            disposition = NSURLSessionAuthChallengePerformDefaultHandling;
+        } else {
+            credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
+            disposition = NSURLSessionAuthChallengeUseCredential;
+        }
+    } else {
+        if (challenge.previousFailureCount == 0) {
+            if (self.credential) {
+                credential = self.credential;
+                disposition = NSURLSessionAuthChallengeUseCredential;
+            } else {
+                disposition = NSURLSessionAuthChallengeCancelAuthenticationChallenge;
+            }
+        } else {
+            disposition = NSURLSessionAuthChallengeCancelAuthenticationChallenge;
+        }
+    }
+    
+    if (completionHandler) {
+        completionHandler(disposition, credential);
+    }
+}
+
+#pragma mark Helper methods
+- (nullable UIImage *)scaledImageForKey:(nullable NSString *)key image:(nullable UIImage *)image {
+    return SDScaledImageForKey(key, image);
+}
+
+- (BOOL)shouldContinueWhenAppEntersBackground {
+    return self.options & SDWebImageDownloaderContinueInBackground;
+}
+
+- (void)callCompletionBlocksWithError:(nullable NSError *)error {
+    [self callCompletionBlocksWithImage:nil imageData:nil error:error finished:YES];
+}
+
+- (void)callCompletionBlocksWithImage:(nullable UIImage *)image
+                            imageData:(nullable NSData *)imageData
+                                error:(nullable NSError *)error
+                             finished:(BOOL)finished {
+    NSArray<id> *completionBlocks = [self callbacksForKey:kCompletedCallbackKey];
+    dispatch_main_async_safe(^{
+        for (SDWebImageDownloaderCompletedBlock completedBlock in completionBlocks) {
+            completedBlock(image, imageData, error, finished);
+        }
+    });
+}
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageFrame.h

@@ -0,0 +1,34 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCompat.h"
+
+@interface SDWebImageFrame : NSObject
+
+// This class is used for creating animated images via `animatedImageWithFrames` in `SDWebImageCoderHelper`. Attention if you need to specify animated images loop count, use `sd_imageLoopCount` property in `UIImage+MultiFormat`.
+
+/**
+ The image of current frame. You should not set an animated image.
+ */
+@property (nonatomic, strong, readonly, nonnull) UIImage *image;
+/**
+ The duration of current frame to be displayed. The number is seconds but not milliseconds. You should not set this to zero.
+ */
+@property (nonatomic, readonly, assign) NSTimeInterval duration;
+
+/**
+ Create a frame instance with specify image and duration
+
+ @param image current frame's image
+ @param duration current frame's duration
+ @return frame instance
+ */
++ (instancetype _Nonnull)frameWithImage:(UIImage * _Nonnull)image duration:(NSTimeInterval)duration;
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageFrame.m

@@ -0,0 +1,28 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageFrame.h"
+
+@interface SDWebImageFrame ()
+
+@property (nonatomic, strong, readwrite, nonnull) UIImage *image;
+@property (nonatomic, readwrite, assign) NSTimeInterval duration;
+
+@end
+
+@implementation SDWebImageFrame
+
++ (instancetype)frameWithImage:(UIImage *)image duration:(NSTimeInterval)duration {
+    SDWebImageFrame *frame = [[SDWebImageFrame alloc] init];
+    frame.image = image;
+    frame.duration = duration;
+    
+    return frame;
+}
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageGIFCoder.h

@@ -0,0 +1,23 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCoder.h"
+
+/**
+ Built in coder using ImageIO that supports GIF encoding/decoding
+ @note `SDWebImageIOCoder` supports GIF but only as static (will use the 1st frame).
+ @note Use `SDWebImageGIFCoder` for fully animated GIFs - less performant than `FLAnimatedImage`
+ @note If you decide to make all `UIImageView`(including `FLAnimatedImageView`) instance support GIF. You should add this coder to `SDWebImageCodersManager` and make sure that it has a higher priority than `SDWebImageIOCoder`
+ @note The recommended approach for animated GIFs is using `FLAnimatedImage`. It's more performant than `UIImageView` for GIF displaying
+ */
+@interface SDWebImageGIFCoder : NSObject <SDWebImageCoder>
+
++ (nonnull instancetype)sharedCoder;
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageGIFCoder.m

@@ -0,0 +1,184 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageGIFCoder.h"
+#import "NSImage+WebCache.h"
+#import <ImageIO/ImageIO.h>
+#import "NSData+ImageContentType.h"
+#import "UIImage+MultiFormat.h"
+#import "SDWebImageCoderHelper.h"
+#import "SDAnimatedImageRep.h"
+
+@implementation SDWebImageGIFCoder
+
++ (instancetype)sharedCoder {
+    static SDWebImageGIFCoder *coder;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        coder = [[SDWebImageGIFCoder alloc] init];
+    });
+    return coder;
+}
+
+#pragma mark - Decode
+- (BOOL)canDecodeFromData:(nullable NSData *)data {
+    return ([NSData sd_imageFormatForImageData:data] == SDImageFormatGIF);
+}
+
+- (UIImage *)decodedImageWithData:(NSData *)data {
+    if (!data) {
+        return nil;
+    }
+    
+#if SD_MAC
+    SDAnimatedImageRep *imageRep = [[SDAnimatedImageRep alloc] initWithData:data];
+    NSImage *animatedImage = [[NSImage alloc] initWithSize:imageRep.size];
+    [animatedImage addRepresentation:imageRep];
+    return animatedImage;
+#else
+    
+    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
+    if (!source) {
+        return nil;
+    }
+    size_t count = CGImageSourceGetCount(source);
+    
+    UIImage *animatedImage;
+    
+    if (count <= 1) {
+        animatedImage = [[UIImage alloc] initWithData:data];
+    } else {
+        NSMutableArray<SDWebImageFrame *> *frames = [NSMutableArray array];
+        
+        for (size_t i = 0; i < count; i++) {
+            CGImageRef imageRef = CGImageSourceCreateImageAtIndex(source, i, NULL);
+            if (!imageRef) {
+                continue;
+            }
+            
+            float duration = [self sd_frameDurationAtIndex:i source:source];
+            UIImage *image = [[UIImage alloc] initWithCGImage:imageRef];
+            CGImageRelease(imageRef);
+            
+            SDWebImageFrame *frame = [SDWebImageFrame frameWithImage:image duration:duration];
+            [frames addObject:frame];
+        }
+        
+        NSUInteger loopCount = 1;
+        NSDictionary *imageProperties = (__bridge_transfer NSDictionary *)CGImageSourceCopyProperties(source, nil);
+        NSDictionary *gifProperties = [imageProperties valueForKey:(__bridge NSString *)kCGImagePropertyGIFDictionary];
+        if (gifProperties) {
+            NSNumber *gifLoopCount = [gifProperties valueForKey:(__bridge NSString *)kCGImagePropertyGIFLoopCount];
+            if (gifLoopCount != nil) {
+                loopCount = gifLoopCount.unsignedIntegerValue;
+            }
+        }
+        
+        animatedImage = [SDWebImageCoderHelper animatedImageWithFrames:frames];
+        animatedImage.sd_imageLoopCount = loopCount;
+        animatedImage.sd_imageFormat = SDImageFormatGIF;
+    }
+    
+    CFRelease(source);
+    
+    return animatedImage;
+#endif
+}
+
+- (float)sd_frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source {
+    float frameDuration = 0.1f;
+    CFDictionaryRef cfFrameProperties = CGImageSourceCopyPropertiesAtIndex(source, index, nil);
+    if (!cfFrameProperties) {
+        return frameDuration;
+    }
+    NSDictionary *frameProperties = (__bridge NSDictionary *)cfFrameProperties;
+    NSDictionary *gifProperties = frameProperties[(NSString *)kCGImagePropertyGIFDictionary];
+    
+    NSNumber *delayTimeUnclampedProp = gifProperties[(NSString *)kCGImagePropertyGIFUnclampedDelayTime];
+    if (delayTimeUnclampedProp != nil) {
+        frameDuration = [delayTimeUnclampedProp floatValue];
+    } else {
+        NSNumber *delayTimeProp = gifProperties[(NSString *)kCGImagePropertyGIFDelayTime];
+        if (delayTimeProp != nil) {
+            frameDuration = [delayTimeProp floatValue];
+        }
+    }
+    
+    // Many annoying ads specify a 0 duration to make an image flash as quickly as possible.
+    // We follow Firefox's behavior and use a duration of 100 ms for any frames that specify
+    // a duration of <= 10 ms. See <rdar://problem/7689300> and <http://webkit.org/b/36082>
+    // for more information.
+    
+    if (frameDuration < 0.011f) {
+        frameDuration = 0.100f;
+    }
+    
+    CFRelease(cfFrameProperties);
+    return frameDuration;
+}
+
+- (UIImage *)decompressedImageWithImage:(UIImage *)image
+                                   data:(NSData *__autoreleasing  _Nullable *)data
+                                options:(nullable NSDictionary<NSString*, NSObject*>*)optionsDict {
+    // GIF do not decompress
+    return image;
+}
+
+#pragma mark - Encode
+- (BOOL)canEncodeToFormat:(SDImageFormat)format {
+    return (format == SDImageFormatGIF);
+}
+
+- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format {
+    if (!image) {
+        return nil;
+    }
+    
+    if (format != SDImageFormatGIF) {
+        return nil;
+    }
+    
+    NSMutableData *imageData = [NSMutableData data];
+    CFStringRef imageUTType = [NSData sd_UTTypeFromSDImageFormat:SDImageFormatGIF];
+    NSArray<SDWebImageFrame *> *frames = [SDWebImageCoderHelper framesFromAnimatedImage:image];
+    
+    // Create an image destination. GIF does not support EXIF image orientation
+    CGImageDestinationRef imageDestination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)imageData, imageUTType, frames.count, NULL);
+    if (!imageDestination) {
+        // Handle failure.
+        return nil;
+    }
+    if (frames.count == 0) {
+        // for static single GIF images
+        CGImageDestinationAddImage(imageDestination, image.CGImage, nil);
+    } else {
+        // for animated GIF images
+        NSUInteger loopCount = image.sd_imageLoopCount;
+        NSDictionary *gifProperties = @{(__bridge NSString *)kCGImagePropertyGIFDictionary: @{(__bridge NSString *)kCGImagePropertyGIFLoopCount : @(loopCount)}};
+        CGImageDestinationSetProperties(imageDestination, (__bridge CFDictionaryRef)gifProperties);
+        
+        for (size_t i = 0; i < frames.count; i++) {
+            SDWebImageFrame *frame = frames[i];
+            float frameDuration = frame.duration;
+            CGImageRef frameImageRef = frame.image.CGImage;
+            NSDictionary *frameProperties = @{(__bridge NSString *)kCGImagePropertyGIFDictionary : @{(__bridge NSString *)kCGImagePropertyGIFDelayTime : @(frameDuration)}};
+            CGImageDestinationAddImage(imageDestination, frameImageRef, (__bridge CFDictionaryRef)frameProperties);
+        }
+    }
+    // Finalize the destination.
+    if (CGImageDestinationFinalize(imageDestination) == NO) {
+        // Handle failure.
+        imageData = nil;
+    }
+    
+    CFRelease(imageDestination);
+    
+    return [imageData copy];
+}
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageImageIOCoder.h

@@ -0,0 +1,30 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageCoder.h"
+
+/**
+ Built in coder that supports PNG, JPEG, TIFF, includes support for progressive decoding.
+ 
+ GIF
+ Also supports static GIF (meaning will only handle the 1st frame).
+ For a full GIF support, we recommend `FLAnimatedImage` or our less performant `SDWebImageGIFCoder`
+ 
+ HEIC
+ This coder also supports HEIC format because ImageIO supports it natively. But it depends on the system capabilities, so it won't work on all devices, see: https://devstreaming-cdn.apple.com/videos/wwdc/2017/511tj33587vdhds/511/511_working_with_heif_and_hevc.pdf
+ Decode(Software): !Simulator && (iOS 11 || tvOS 11 || macOS 10.13)
+ Decode(Hardware): !Simulator && ((iOS 11 && A9Chip) || (macOS 10.13 && 6thGenerationIntelCPU))
+ Encode(Software): macOS 10.13
+ Encode(Hardware): !Simulator && ((iOS 11 && A10FusionChip) || (macOS 10.13 && 6thGenerationIntelCPU))
+ */
+@interface SDWebImageImageIOCoder : NSObject <SDWebImageProgressiveCoder>
+
++ (nonnull instancetype)sharedCoder;
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageImageIOCoder.m

@@ -0,0 +1,536 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageImageIOCoder.h"
+#import "SDWebImageCoderHelper.h"
+#import "NSImage+WebCache.h"
+#import <ImageIO/ImageIO.h>
+#import "NSData+ImageContentType.h"
+#import "UIImage+MultiFormat.h"
+
+#if SD_UIKIT || SD_WATCH
+static const size_t kBytesPerPixel = 4;
+static const size_t kBitsPerComponent = 8;
+
+/*
+ * Defines the maximum size in MB of the decoded image when the flag `SDWebImageScaleDownLargeImages` is set
+ * Suggested value for iPad1 and iPhone 3GS: 60.
+ * Suggested value for iPad2 and iPhone 4: 120.
+ * Suggested value for iPhone 3G and iPod 2 and earlier devices: 30.
+ */
+static const CGFloat kDestImageSizeMB = 60.0f;
+
+/*
+ * Defines the maximum size in MB of a tile used to decode image when the flag `SDWebImageScaleDownLargeImages` is set
+ * Suggested value for iPad1 and iPhone 3GS: 20.
+ * Suggested value for iPad2 and iPhone 4: 40.
+ * Suggested value for iPhone 3G and iPod 2 and earlier devices: 10.
+ */
+static const CGFloat kSourceImageTileSizeMB = 20.0f;
+
+static const CGFloat kBytesPerMB = 1024.0f * 1024.0f;
+static const CGFloat kPixelsPerMB = kBytesPerMB / kBytesPerPixel;
+static const CGFloat kDestTotalPixels = kDestImageSizeMB * kPixelsPerMB;
+static const CGFloat kTileTotalPixels = kSourceImageTileSizeMB * kPixelsPerMB;
+
+static const CGFloat kDestSeemOverlap = 2.0f;   // the numbers of pixels to overlap the seems where tiles meet.
+#endif
+
+@implementation SDWebImageImageIOCoder {
+        size_t _width, _height;
+#if SD_UIKIT || SD_WATCH
+        UIImageOrientation _orientation;
+#endif
+        CGImageSourceRef _imageSource;
+}
+
+- (void)dealloc {
+    if (_imageSource) {
+        CFRelease(_imageSource);
+        _imageSource = NULL;
+    }
+}
+
++ (instancetype)sharedCoder {
+    static SDWebImageImageIOCoder *coder;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        coder = [[SDWebImageImageIOCoder alloc] init];
+    });
+    return coder;
+}
+
+#pragma mark - Decode
+- (BOOL)canDecodeFromData:(nullable NSData *)data {
+    switch ([NSData sd_imageFormatForImageData:data]) {
+        case SDImageFormatWebP:
+            // Do not support WebP decoding
+            return NO;
+        case SDImageFormatHEIC:
+            // Check HEIC decoding compatibility
+            return [[self class] canDecodeFromHEICFormat];
+        case SDImageFormatHEIF:
+            // Check HEIF decoding compatibility
+            return [[self class] canDecodeFromHEIFFormat];
+        default:
+            return YES;
+    }
+}
+
+- (BOOL)canIncrementallyDecodeFromData:(NSData *)data {
+    switch ([NSData sd_imageFormatForImageData:data]) {
+        case SDImageFormatWebP:
+            // Do not support WebP progressive decoding
+            return NO;
+        case SDImageFormatHEIC:
+            // Check HEIC decoding compatibility
+            return [[self class] canDecodeFromHEICFormat];
+        case SDImageFormatHEIF:
+            // Check HEIF decoding compatibility
+            return [[self class] canDecodeFromHEIFFormat];
+        default:
+            return YES;
+    }
+}
+
+- (UIImage *)decodedImageWithData:(NSData *)data {
+    if (!data) {
+        return nil;
+    }
+    
+    UIImage *image = [[UIImage alloc] initWithData:data];
+    image.sd_imageFormat = [NSData sd_imageFormatForImageData:data];
+    
+    return image;
+}
+
+- (UIImage *)incrementallyDecodedImageWithData:(NSData *)data finished:(BOOL)finished {
+    if (!_imageSource) {
+        _imageSource = CGImageSourceCreateIncremental(NULL);
+    }
+    UIImage *image;
+    
+    // The following code is from http://www.cocoaintheshell.com/2011/05/progressive-images-download-imageio/
+    // Thanks to the author @Nyx0uf
+    
+    // Update the data source, we must pass ALL the data, not just the new bytes
+    CGImageSourceUpdateData(_imageSource, (__bridge CFDataRef)data, finished);
+    
+    if (_width + _height == 0) {
+        CFDictionaryRef properties = CGImageSourceCopyPropertiesAtIndex(_imageSource, 0, NULL);
+        if (properties) {
+            NSInteger orientationValue = 1;
+            CFTypeRef val = CFDictionaryGetValue(properties, kCGImagePropertyPixelHeight);
+            if (val) CFNumberGetValue(val, kCFNumberLongType, &_height);
+            val = CFDictionaryGetValue(properties, kCGImagePropertyPixelWidth);
+            if (val) CFNumberGetValue(val, kCFNumberLongType, &_width);
+            val = CFDictionaryGetValue(properties, kCGImagePropertyOrientation);
+            if (val) CFNumberGetValue(val, kCFNumberNSIntegerType, &orientationValue);
+            CFRelease(properties);
+            
+            // When we draw to Core Graphics, we lose orientation information,
+            // which means the image below born of initWithCGIImage will be
+            // oriented incorrectly sometimes. (Unlike the image born of initWithData
+            // in didCompleteWithError.) So save it here and pass it on later.
+#if SD_UIKIT || SD_WATCH
+            _orientation = [SDWebImageCoderHelper imageOrientationFromEXIFOrientation:orientationValue];
+#endif
+        }
+    }
+    
+    if (_width + _height > 0) {
+        // Create the image
+        CGImageRef partialImageRef = CGImageSourceCreateImageAtIndex(_imageSource, 0, NULL);
+        
+        if (partialImageRef) {
+#if SD_UIKIT || SD_WATCH
+            image = [[UIImage alloc] initWithCGImage:partialImageRef scale:1 orientation:_orientation];
+#elif SD_MAC
+            image = [[UIImage alloc] initWithCGImage:partialImageRef size:NSZeroSize];
+#endif
+            CGImageRelease(partialImageRef);
+            image.sd_imageFormat = [NSData sd_imageFormatForImageData:data];
+        }
+    }
+    
+    if (finished) {
+        if (_imageSource) {
+            CFRelease(_imageSource);
+            _imageSource = NULL;
+        }
+    }
+    
+    return image;
+}
+
+- (UIImage *)decompressedImageWithImage:(UIImage *)image
+                                   data:(NSData *__autoreleasing  _Nullable *)data
+                                options:(nullable NSDictionary<NSString*, NSObject*>*)optionsDict {
+#if SD_MAC
+    return image;
+#endif
+#if SD_UIKIT || SD_WATCH
+    BOOL shouldScaleDown = NO;
+    if (optionsDict != nil) {
+        NSNumber *scaleDownLargeImagesOption = nil;
+        if ([optionsDict[SDWebImageCoderScaleDownLargeImagesKey] isKindOfClass:[NSNumber class]]) {
+            scaleDownLargeImagesOption = (NSNumber *)optionsDict[SDWebImageCoderScaleDownLargeImagesKey];
+        }
+        if (scaleDownLargeImagesOption != nil) {
+            shouldScaleDown = [scaleDownLargeImagesOption boolValue];
+        }
+    }
+    if (!shouldScaleDown) {
+        return [self sd_decompressedImageWithImage:image];
+    } else {
+        UIImage *scaledDownImage = [self sd_decompressedAndScaledDownImageWithImage:image];
+        if (scaledDownImage && !CGSizeEqualToSize(scaledDownImage.size, image.size)) {
+            // if the image is scaled down, need to modify the data pointer as well
+            SDImageFormat format = [NSData sd_imageFormatForImageData:*data];
+            NSData *imageData = [self encodedDataWithImage:scaledDownImage format:format];
+            if (imageData) {
+                *data = imageData;
+            }
+        }
+        return scaledDownImage;
+    }
+#endif
+}
+
+#if SD_UIKIT || SD_WATCH
+- (nullable UIImage *)sd_decompressedImageWithImage:(nullable UIImage *)image {
+    if (![[self class] shouldDecodeImage:image]) {
+        return image;
+    }
+    
+    // autorelease the bitmap context and all vars to help system to free memory when there are memory warning.
+    // on iOS7, do not forget to call [[SDImageCache sharedImageCache] clearMemory];
+    @autoreleasepool{
+        
+        CGImageRef imageRef = image.CGImage;
+        // device color space
+        CGColorSpaceRef colorspaceRef = SDCGColorSpaceGetDeviceRGB();
+        BOOL hasAlpha = SDCGImageRefContainsAlpha(imageRef);
+        // iOS display alpha info (BRGA8888/BGRX8888)
+        CGBitmapInfo bitmapInfo = kCGBitmapByteOrder32Host;
+        bitmapInfo |= hasAlpha ? kCGImageAlphaPremultipliedFirst : kCGImageAlphaNoneSkipFirst;
+        
+        size_t width = CGImageGetWidth(imageRef);
+        size_t height = CGImageGetHeight(imageRef);
+        
+        // kCGImageAlphaNone is not supported in CGBitmapContextCreate.
+        // Since the original image here has no alpha info, use kCGImageAlphaNoneSkipLast
+        // to create bitmap graphics contexts without alpha info.
+        CGContextRef context = CGBitmapContextCreate(NULL,
+                                                     width,
+                                                     height,
+                                                     kBitsPerComponent,
+                                                     0,
+                                                     colorspaceRef,
+                                                     bitmapInfo);
+        if (context == NULL) {
+            return image;
+        }
+        
+        // Draw the image into the context and retrieve the new bitmap image without alpha
+        CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);
+        CGImageRef imageRefWithoutAlpha = CGBitmapContextCreateImage(context);
+        UIImage *imageWithoutAlpha = [[UIImage alloc] initWithCGImage:imageRefWithoutAlpha scale:image.scale orientation:image.imageOrientation];
+        CGContextRelease(context);
+        CGImageRelease(imageRefWithoutAlpha);
+        
+        return imageWithoutAlpha;
+    }
+}
+
+- (nullable UIImage *)sd_decompressedAndScaledDownImageWithImage:(nullable UIImage *)image {
+    if (![[self class] shouldDecodeImage:image]) {
+        return image;
+    }
+    
+    if (![[self class] shouldScaleDownImage:image]) {
+        return [self sd_decompressedImageWithImage:image];
+    }
+    
+    CGContextRef destContext;
+    
+    // autorelease the bitmap context and all vars to help system to free memory when there are memory warning.
+    // on iOS7, do not forget to call [[SDImageCache sharedImageCache] clearMemory];
+    @autoreleasepool {
+        CGImageRef sourceImageRef = image.CGImage;
+        
+        CGSize sourceResolution = CGSizeZero;
+        sourceResolution.width = CGImageGetWidth(sourceImageRef);
+        sourceResolution.height = CGImageGetHeight(sourceImageRef);
+        float sourceTotalPixels = sourceResolution.width * sourceResolution.height;
+        // Determine the scale ratio to apply to the input image
+        // that results in an output image of the defined size.
+        // see kDestImageSizeMB, and how it relates to destTotalPixels.
+        float imageScale = kDestTotalPixels / sourceTotalPixels;
+        CGSize destResolution = CGSizeZero;
+        destResolution.width = (int)(sourceResolution.width*imageScale);
+        destResolution.height = (int)(sourceResolution.height*imageScale);
+        
+        // device color space
+        CGColorSpaceRef colorspaceRef = SDCGColorSpaceGetDeviceRGB();
+        BOOL hasAlpha = SDCGImageRefContainsAlpha(sourceImageRef);
+        // iOS display alpha info (BGRA8888/BGRX8888)
+        CGBitmapInfo bitmapInfo = kCGBitmapByteOrder32Host;
+        bitmapInfo |= hasAlpha ? kCGImageAlphaPremultipliedFirst : kCGImageAlphaNoneSkipFirst;
+        
+        // kCGImageAlphaNone is not supported in CGBitmapContextCreate.
+        // Since the original image here has no alpha info, use kCGImageAlphaNoneSkipLast
+        // to create bitmap graphics contexts without alpha info.
+        destContext = CGBitmapContextCreate(NULL,
+                                            destResolution.width,
+                                            destResolution.height,
+                                            kBitsPerComponent,
+                                            0,
+                                            colorspaceRef,
+                                            bitmapInfo);
+        
+        if (destContext == NULL) {
+            return image;
+        }
+        CGContextSetInterpolationQuality(destContext, kCGInterpolationHigh);
+        
+        // Now define the size of the rectangle to be used for the
+        // incremental blits from the input image to the output image.
+        // we use a source tile width equal to the width of the source
+        // image due to the way that iOS retrieves image data from disk.
+        // iOS must decode an image from disk in full width 'bands', even
+        // if current graphics context is clipped to a subrect within that
+        // band. Therefore we fully utilize all of the pixel data that results
+        // from a decoding opertion by achnoring our tile size to the full
+        // width of the input image.
+        CGRect sourceTile = CGRectZero;
+        sourceTile.size.width = sourceResolution.width;
+        // The source tile height is dynamic. Since we specified the size
+        // of the source tile in MB, see how many rows of pixels high it
+        // can be given the input image width.
+        sourceTile.size.height = (int)(kTileTotalPixels / sourceTile.size.width );
+        sourceTile.origin.x = 0.0f;
+        // The output tile is the same proportions as the input tile, but
+        // scaled to image scale.
+        CGRect destTile;
+        destTile.size.width = destResolution.width;
+        destTile.size.height = sourceTile.size.height * imageScale;
+        destTile.origin.x = 0.0f;
+        // The source seem overlap is proportionate to the destination seem overlap.
+        // this is the amount of pixels to overlap each tile as we assemble the ouput image.
+        float sourceSeemOverlap = (int)((kDestSeemOverlap/destResolution.height)*sourceResolution.height);
+        CGImageRef sourceTileImageRef;
+        // calculate the number of read/write operations required to assemble the
+        // output image.
+        int iterations = (int)( sourceResolution.height / sourceTile.size.height );
+        // If tile height doesn't divide the image height evenly, add another iteration
+        // to account for the remaining pixels.
+        int remainder = (int)sourceResolution.height % (int)sourceTile.size.height;
+        if(remainder) {
+            iterations++;
+        }
+        // Add seem overlaps to the tiles, but save the original tile height for y coordinate calculations.
+        float sourceTileHeightMinusOverlap = sourceTile.size.height;
+        sourceTile.size.height += sourceSeemOverlap;
+        destTile.size.height += kDestSeemOverlap;
+        for( int y = 0; y < iterations; ++y ) {
+            @autoreleasepool {
+                sourceTile.origin.y = y * sourceTileHeightMinusOverlap + sourceSeemOverlap;
+                destTile.origin.y = destResolution.height - (( y + 1 ) * sourceTileHeightMinusOverlap * imageScale + kDestSeemOverlap);
+                sourceTileImageRef = CGImageCreateWithImageInRect( sourceImageRef, sourceTile );
+                if( y == iterations - 1 && remainder ) {
+                    float dify = destTile.size.height;
+                    destTile.size.height = CGImageGetHeight( sourceTileImageRef ) * imageScale;
+                    dify -= destTile.size.height;
+                    destTile.origin.y += dify;
+                }
+                CGContextDrawImage( destContext, destTile, sourceTileImageRef );
+                CGImageRelease( sourceTileImageRef );
+            }
+        }
+        
+        CGImageRef destImageRef = CGBitmapContextCreateImage(destContext);
+        CGContextRelease(destContext);
+        if (destImageRef == NULL) {
+            return image;
+        }
+        UIImage *destImage = [[UIImage alloc] initWithCGImage:destImageRef scale:image.scale orientation:image.imageOrientation];
+        CGImageRelease(destImageRef);
+        if (destImage == nil) {
+            return image;
+        }
+        return destImage;
+    }
+}
+#endif
+
+#pragma mark - Encode
+- (BOOL)canEncodeToFormat:(SDImageFormat)format {
+    switch (format) {
+        case SDImageFormatWebP:
+            // Do not support WebP encoding
+            return NO;
+        case SDImageFormatHEIC:
+            // Check HEIC encoding compatibility
+            return [[self class] canEncodeToHEICFormat];
+        case SDImageFormatHEIF:
+            // Check HEIF encoding compatibility
+            return [[self class] canEncodeToHEIFFormat];
+        default:
+            return YES;
+    }
+}
+
+- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format {
+    if (!image) {
+        return nil;
+    }
+    
+    if (format == SDImageFormatUndefined) {
+        BOOL hasAlpha = SDCGImageRefContainsAlpha(image.CGImage);
+        if (hasAlpha) {
+            format = SDImageFormatPNG;
+        } else {
+            format = SDImageFormatJPEG;
+        }
+    }
+    
+    NSMutableData *imageData = [NSMutableData data];
+    CFStringRef imageUTType = [NSData sd_UTTypeFromSDImageFormat:format];
+    
+    // Create an image destination.
+    CGImageDestinationRef imageDestination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)imageData, imageUTType, 1, NULL);
+    if (!imageDestination) {
+        // Handle failure.
+        return nil;
+    }
+    
+    NSMutableDictionary *properties = [NSMutableDictionary dictionary];
+#if SD_UIKIT || SD_WATCH
+    NSInteger exifOrientation = [SDWebImageCoderHelper exifOrientationFromImageOrientation:image.imageOrientation];
+    [properties setValue:@(exifOrientation) forKey:(__bridge NSString *)kCGImagePropertyOrientation];
+#endif
+    
+    // Add your image to the destination.
+    CGImageDestinationAddImage(imageDestination, image.CGImage, (__bridge CFDictionaryRef)properties);
+    
+    // Finalize the destination.
+    if (CGImageDestinationFinalize(imageDestination) == NO) {
+        // Handle failure.
+        imageData = nil;
+    }
+    
+    CFRelease(imageDestination);
+    
+    return [imageData copy];
+}
+
+#pragma mark - Helper
++ (BOOL)shouldDecodeImage:(nullable UIImage *)image {
+    // Prevent "CGBitmapContextCreateImage: invalid context 0x0" error
+    if (image == nil) {
+        return NO;
+    }
+    
+    // do not decode animated images
+    if (image.images != nil) {
+        return NO;
+    }
+    
+    return YES;
+}
+
++ (BOOL)canDecodeFromHEICFormat {
+    static BOOL canDecode = NO;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        CFStringRef imageUTType = [NSData sd_UTTypeFromSDImageFormat:SDImageFormatHEIC];
+        NSArray *imageUTTypes = (__bridge_transfer NSArray *)CGImageSourceCopyTypeIdentifiers();
+        if ([imageUTTypes containsObject:(__bridge NSString *)(imageUTType)]) {
+            canDecode = YES;
+        }
+    });
+    return canDecode;
+}
+
++ (BOOL)canDecodeFromHEIFFormat {
+    static BOOL canDecode = NO;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        CFStringRef imageUTType = [NSData sd_UTTypeFromSDImageFormat:SDImageFormatHEIF];
+        NSArray *imageUTTypes = (__bridge_transfer NSArray *)CGImageSourceCopyTypeIdentifiers();
+        if ([imageUTTypes containsObject:(__bridge NSString *)(imageUTType)]) {
+            canDecode = YES;
+        }
+    });
+    return canDecode;
+}
+
++ (BOOL)canEncodeToHEICFormat {
+    static BOOL canEncode = NO;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        NSMutableData *imageData = [NSMutableData data];
+        CFStringRef imageUTType = [NSData sd_UTTypeFromSDImageFormat:SDImageFormatHEIC];
+        
+        // Create an image destination.
+        CGImageDestinationRef imageDestination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)imageData, imageUTType, 1, NULL);
+        if (!imageDestination) {
+            // Can't encode to HEIC
+            canEncode = NO;
+        } else {
+            // Can encode to HEIC
+            CFRelease(imageDestination);
+            canEncode = YES;
+        }
+    });
+    return canEncode;
+}
+
++ (BOOL)canEncodeToHEIFFormat {
+    static BOOL canEncode = NO;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        NSMutableData *imageData = [NSMutableData data];
+        CFStringRef imageUTType = [NSData sd_UTTypeFromSDImageFormat:SDImageFormatHEIF];
+        
+        // Create an image destination.
+        CGImageDestinationRef imageDestination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)imageData, imageUTType, 1, NULL);
+        if (!imageDestination) {
+            // Can't encode to HEIF
+            canEncode = NO;
+        } else {
+            // Can encode to HEIF
+            CFRelease(imageDestination);
+            canEncode = YES;
+        }
+    });
+    return canEncode;
+}
+
+#if SD_UIKIT || SD_WATCH
++ (BOOL)shouldScaleDownImage:(nonnull UIImage *)image {
+    BOOL shouldScaleDown = YES;
+    
+    CGImageRef sourceImageRef = image.CGImage;
+    CGSize sourceResolution = CGSizeZero;
+    sourceResolution.width = CGImageGetWidth(sourceImageRef);
+    sourceResolution.height = CGImageGetHeight(sourceImageRef);
+    float sourceTotalPixels = sourceResolution.width * sourceResolution.height;
+    float imageScale = kDestTotalPixels / sourceTotalPixels;
+    if (imageScale < 1) {
+        shouldScaleDown = YES;
+    } else {
+        shouldScaleDown = NO;
+    }
+    
+    return shouldScaleDown;
+}
+#endif
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageManager.h

@@ -0,0 +1,328 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import "SDWebImageOperation.h"
+#import "SDWebImageDownloader.h"
+#import "SDImageCache.h"
+
+typedef NS_OPTIONS(NSUInteger, SDWebImageOptions) {
+    /**
+     * By default, when a URL fail to be downloaded, the URL is blacklisted so the library won't keep trying.
+     * This flag disable this blacklisting.
+     */
+    SDWebImageRetryFailed = 1 << 0,
+
+    /**
+     * By default, image downloads are started during UI interactions, this flags disable this feature,
+     * leading to delayed download on UIScrollView deceleration for instance.
+     */
+    SDWebImageLowPriority = 1 << 1,
+
+    /**
+     * This flag disables on-disk caching after the download finished, only cache in memory
+     */
+    SDWebImageCacheMemoryOnly = 1 << 2,
+
+    /**
+     * This flag enables progressive download, the image is displayed progressively during download as a browser would do.
+     * By default, the image is only displayed once completely downloaded.
+     */
+    SDWebImageProgressiveDownload = 1 << 3,
+
+    /**
+     * Even if the image is cached, respect the HTTP response cache control, and refresh the image from remote location if needed.
+     * The disk caching will be handled by NSURLCache instead of SDWebImage leading to slight performance degradation.
+     * This option helps deal with images changing behind the same request URL, e.g. Facebook graph api profile pics.
+     * If a cached image is refreshed, the completion block is called once with the cached image and again with the final image.
+     *
+     * Use this flag only if you can't make your URLs static with embedded cache busting parameter.
+     */
+    SDWebImageRefreshCached = 1 << 4,
+
+    /**
+     * In iOS 4+, continue the download of the image if the app goes to background. This is achieved by asking the system for
+     * extra time in background to let the request finish. If the background task expires the operation will be cancelled.
+     */
+    SDWebImageContinueInBackground = 1 << 5,
+
+    /**
+     * Handles cookies stored in NSHTTPCookieStore by setting
+     * NSMutableURLRequest.HTTPShouldHandleCookies = YES;
+     */
+    SDWebImageHandleCookies = 1 << 6,
+
+    /**
+     * Enable to allow untrusted SSL certificates.
+     * Useful for testing purposes. Use with caution in production.
+     */
+    SDWebImageAllowInvalidSSLCertificates = 1 << 7,
+
+    /**
+     * By default, images are loaded in the order in which they were queued. This flag moves them to
+     * the front of the queue.
+     */
+    SDWebImageHighPriority = 1 << 8,
+    
+    /**
+     * By default, placeholder images are loaded while the image is loading. This flag will delay the loading
+     * of the placeholder image until after the image has finished loading.
+     */
+    SDWebImageDelayPlaceholder = 1 << 9,
+
+    /**
+     * We usually don't call transformDownloadedImage delegate method on animated images,
+     * as most transformation code would mangle it.
+     * Use this flag to transform them anyway.
+     */
+    SDWebImageTransformAnimatedImage = 1 << 10,
+    
+    /**
+     * By default, image is added to the imageView after download. But in some cases, we want to
+     * have the hand before setting the image (apply a filter or add it with cross-fade animation for instance)
+     * Use this flag if you want to manually set the image in the completion when success
+     */
+    SDWebImageAvoidAutoSetImage = 1 << 11,
+    
+    /**
+     * By default, images are decoded respecting their original size. On iOS, this flag will scale down the
+     * images to a size compatible with the constrained memory of devices.
+     * If `SDWebImageProgressiveDownload` flag is set the scale down is deactivated.
+     */
+    SDWebImageScaleDownLargeImages = 1 << 12,
+    
+    /**
+     * By default, we do not query disk data when the image is cached in memory. This mask can force to query disk data at the same time.
+     * This flag is recommend to be used with `SDWebImageQueryDiskSync` to ensure the image is loaded in the same runloop.
+     */
+    SDWebImageQueryDataWhenInMemory = 1 << 13,
+    
+    /**
+     * By default, we query the memory cache synchronously, disk cache asynchronously. This mask can force to query disk cache synchronously to ensure that image is loaded in the same runloop.
+     * This flag can avoid flashing during cell reuse if you disable memory cache or in some other cases.
+     */
+    SDWebImageQueryDiskSync = 1 << 14,
+    
+    /**
+     * By default, when the cache missed, the image is download from the network. This flag can prevent network to load from cache only.
+     */
+    SDWebImageFromCacheOnly = 1 << 15,
+    /**
+     * By default, when you use `SDWebImageTransition` to do some view transition after the image load finished, this transition is only applied for image download from the network. This mask can force to apply view transition for memory and disk cache as well.
+     */
+    SDWebImageForceTransition = 1 << 16
+};
+
+typedef void(^SDExternalCompletionBlock)(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL);
+
+typedef void(^SDInternalCompletionBlock)(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL);
+
+typedef NSString * _Nullable(^SDWebImageCacheKeyFilterBlock)(NSURL * _Nullable url);
+
+typedef NSData * _Nullable(^SDWebImageCacheSerializerBlock)(UIImage * _Nonnull image, NSData * _Nullable data, NSURL * _Nullable imageURL);
+
+
+@class SDWebImageManager;
+
+@protocol SDWebImageManagerDelegate <NSObject>
+
+@optional
+
+/**
+ * Controls which image should be downloaded when the image is not found in the cache.
+ *
+ * @param imageManager The current `SDWebImageManager`
+ * @param imageURL     The url of the image to be downloaded
+ *
+ * @return Return NO to prevent the downloading of the image on cache misses. If not implemented, YES is implied.
+ */
+- (BOOL)imageManager:(nonnull SDWebImageManager *)imageManager shouldDownloadImageForURL:(nullable NSURL *)imageURL;
+
+/**
+ * Controls the complicated logic to mark as failed URLs when download error occur.
+ * If the delegate implement this method, we will not use the built-in way to mark URL as failed based on error code;
+ @param imageManager The current `SDWebImageManager`
+ @param imageURL The url of the image
+ @param error The download error for the url
+ @return Whether to block this url or not. Return YES to mark this URL as failed.
+ */
+- (BOOL)imageManager:(nonnull SDWebImageManager *)imageManager shouldBlockFailedURL:(nonnull NSURL *)imageURL withError:(nonnull NSError *)error;
+
+/**
+ * Allows to transform the image immediately after it has been downloaded and just before to cache it on disk and memory.
+ * NOTE: This method is called from a global queue in order to not to block the main thread.
+ *
+ * @param imageManager The current `SDWebImageManager`
+ * @param image        The image to transform
+ * @param imageURL     The url of the image to transform
+ *
+ * @return The transformed image object.
+ */
+- (nullable UIImage *)imageManager:(nonnull SDWebImageManager *)imageManager transformDownloadedImage:(nullable UIImage *)image withURL:(nullable NSURL *)imageURL;
+
+@end
+
+/**
+ * The SDWebImageManager is the class behind the UIImageView+WebCache category and likes.
+ * It ties the asynchronous downloader (SDWebImageDownloader) with the image cache store (SDImageCache).
+ * You can use this class directly to benefit from web image downloading with caching in another context than
+ * a UIView.
+ *
+ * Here is a simple example of how to use SDWebImageManager:
+ *
+ * @code
+
+SDWebImageManager *manager = [SDWebImageManager sharedManager];
+[manager loadImageWithURL:imageURL
+                  options:0
+                 progress:nil
+                completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
+                    if (image) {
+                        // do something with image
+                    }
+                }];
+
+ * @endcode
+ */
+@interface SDWebImageManager : NSObject
+
+@property (weak, nonatomic, nullable) id <SDWebImageManagerDelegate> delegate;
+
+@property (strong, nonatomic, readonly, nullable) SDImageCache *imageCache;
+@property (strong, nonatomic, readonly, nullable) SDWebImageDownloader *imageDownloader;
+
+/**
+ * The cache filter is a block used each time SDWebImageManager need to convert an URL into a cache key. This can
+ * be used to remove dynamic part of an image URL.
+ *
+ * The following example sets a filter in the application delegate that will remove any query-string from the
+ * URL before to use it as a cache key:
+ *
+ * @code
+
+SDWebImageManager.sharedManager.cacheKeyFilter = ^(NSURL * _Nullable url) {
+    url = [[NSURL alloc] initWithScheme:url.scheme host:url.host path:url.path];
+    return [url absoluteString];
+};
+
+ * @endcode
+ */
+@property (nonatomic, copy, nullable) SDWebImageCacheKeyFilterBlock cacheKeyFilter;
+
+/**
+ * The cache serializer is a block used to convert the decoded image, the source downloaded data, to the actual data used for storing to the disk cache. If you return nil, means to generate the data from the image instance, see `SDImageCache`.
+ * For example, if you are using WebP images and facing the slow decoding time issue when later retriving from disk cache again. You can try to encode the decoded image to JPEG/PNG format to disk cache instead of source downloaded data.
+ * @note The `image` arg is nonnull, but when you also provide a image transformer and the image is transformed, the `data` arg may be nil, take attention to this case.
+ * @note This method is called from a global queue in order to not to block the main thread.
+ * @code
+ SDWebImageManager.sharedManager.cacheSerializer = ^NSData * _Nullable(UIImage * _Nonnull image, NSData * _Nullable data, NSURL * _Nullable imageURL) {
+    SDImageFormat format = [NSData sd_imageFormatForImageData:data];
+    switch (format) {
+        case SDImageFormatWebP:
+            return image.images ? data : nil;
+        default:
+            return data;
+    }
+ };
+ * @endcode
+ * The default value is nil. Means we just store the source downloaded data to disk cache.
+ */
+@property (nonatomic, copy, nullable) SDWebImageCacheSerializerBlock cacheSerializer;
+
+/**
+ * Returns global SDWebImageManager instance.
+ *
+ * @return SDWebImageManager shared instance
+ */
++ (nonnull instancetype)sharedManager;
+
+/**
+ * Allows to specify instance of cache and image downloader used with image manager.
+ * @return new instance of `SDWebImageManager` with specified cache and downloader.
+ */
+- (nonnull instancetype)initWithCache:(nonnull SDImageCache *)cache downloader:(nonnull SDWebImageDownloader *)downloader NS_DESIGNATED_INITIALIZER;
+
+/**
+ * Downloads the image at the given URL if not present in cache or return the cached version otherwise.
+ *
+ * @param url            The URL to the image
+ * @param options        A mask to specify options to use for this request
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed.
+ *
+ *   This parameter is required.
+ * 
+ *   This block has no return value and takes the requested UIImage as first parameter and the NSData representation as second parameter.
+ *   In case of error the image parameter is nil and the third parameter may contain an NSError.
+ *
+ *   The forth parameter is an `SDImageCacheType` enum indicating if the image was retrieved from the local cache
+ *   or from the memory cache or from the network.
+ *
+ *   The fith parameter is set to NO when the SDWebImageProgressiveDownload option is used and the image is
+ *   downloading. This block is thus called repeatedly with a partial image. When image is fully downloaded, the
+ *   block is called a last time with the full image and the last parameter set to YES.
+ *
+ *   The last parameter is the original image URL
+ *
+ * @return Returns an NSObject conforming to SDWebImageOperation. Should be an instance of SDWebImageDownloaderOperation
+ */
+- (nullable id <SDWebImageOperation>)loadImageWithURL:(nullable NSURL *)url
+                                              options:(SDWebImageOptions)options
+                                             progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                                            completed:(nullable SDInternalCompletionBlock)completedBlock;
+
+/**
+ * Saves image to cache for given URL
+ *
+ * @param image The image to cache
+ * @param url   The URL to the image
+ *
+ */
+
+- (void)saveImageToCache:(nullable UIImage *)image forURL:(nullable NSURL *)url;
+
+/**
+ * Cancel all current operations
+ */
+- (void)cancelAll;
+
+/**
+ * Check one or more operations running
+ */
+- (BOOL)isRunning;
+
+/**
+ *  Async check if image has already been cached
+ *
+ *  @param url              image url
+ *  @param completionBlock  the block to be executed when the check is finished
+ *  
+ *  @note the completion block is always executed on the main queue
+ */
+- (void)cachedImageExistsForURL:(nullable NSURL *)url
+                     completion:(nullable SDWebImageCheckCacheCompletionBlock)completionBlock;
+
+/**
+ *  Async check if image has already been cached on disk only
+ *
+ *  @param url              image url
+ *  @param completionBlock  the block to be executed when the check is finished
+ *
+ *  @note the completion block is always executed on the main queue
+ */
+- (void)diskImageExistsForURL:(nullable NSURL *)url
+                   completion:(nullable SDWebImageCheckCacheCompletionBlock)completionBlock;
+
+
+/**
+ *Return the cache key for a given URL
+ */
+- (nullable NSString *)cacheKeyForURL:(nullable NSURL *)url;
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageManager.m

@@ -0,0 +1,370 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageManager.h"
+#import "NSImage+WebCache.h"
+#import <objc/message.h>
+
+#define LOCK(lock) dispatch_semaphore_wait(lock, DISPATCH_TIME_FOREVER);
+#define UNLOCK(lock) dispatch_semaphore_signal(lock);
+
+@interface SDWebImageCombinedOperation : NSObject <SDWebImageOperation>
+
+@property (assign, nonatomic, getter = isCancelled) BOOL cancelled;
+@property (strong, nonatomic, nullable) SDWebImageDownloadToken *downloadToken;
+@property (strong, nonatomic, nullable) NSOperation *cacheOperation;
+@property (weak, nonatomic, nullable) SDWebImageManager *manager;
+
+@end
+
+@interface SDWebImageManager ()
+
+@property (strong, nonatomic, readwrite, nonnull) SDImageCache *imageCache;
+@property (strong, nonatomic, readwrite, nonnull) SDWebImageDownloader *imageDownloader;
+@property (strong, nonatomic, nonnull) NSMutableSet<NSURL *> *failedURLs;
+@property (strong, nonatomic, nonnull) dispatch_semaphore_t failedURLsLock; // a lock to keep the access to `failedURLs` thread-safe
+@property (strong, nonatomic, nonnull) NSMutableSet<SDWebImageCombinedOperation *> *runningOperations;
+@property (strong, nonatomic, nonnull) dispatch_semaphore_t runningOperationsLock; // a lock to keep the access to `runningOperations` thread-safe
+
+@end
+
+@implementation SDWebImageManager
+
++ (nonnull instancetype)sharedManager {
+    static dispatch_once_t once;
+    static id instance;
+    dispatch_once(&once, ^{
+        instance = [self new];
+    });
+    return instance;
+}
+
+- (nonnull instancetype)init {
+    SDImageCache *cache = [SDImageCache sharedImageCache];
+    SDWebImageDownloader *downloader = [SDWebImageDownloader sharedDownloader];
+    return [self initWithCache:cache downloader:downloader];
+}
+
+- (nonnull instancetype)initWithCache:(nonnull SDImageCache *)cache downloader:(nonnull SDWebImageDownloader *)downloader {
+    if ((self = [super init])) {
+        _imageCache = cache;
+        _imageDownloader = downloader;
+        _failedURLs = [NSMutableSet new];
+        _failedURLsLock = dispatch_semaphore_create(1);
+        _runningOperations = [NSMutableSet new];
+        _runningOperationsLock = dispatch_semaphore_create(1);
+    }
+    return self;
+}
+
+- (nullable NSString *)cacheKeyForURL:(nullable NSURL *)url {
+    if (!url) {
+        return @"";
+    }
+
+    if (self.cacheKeyFilter) {
+        return self.cacheKeyFilter(url);
+    } else {
+        return url.absoluteString;
+    }
+}
+
+- (nullable UIImage *)scaledImageForKey:(nullable NSString *)key image:(nullable UIImage *)image {
+    return SDScaledImageForKey(key, image);
+}
+
+- (void)cachedImageExistsForURL:(nullable NSURL *)url
+                     completion:(nullable SDWebImageCheckCacheCompletionBlock)completionBlock {
+    NSString *key = [self cacheKeyForURL:url];
+    
+    BOOL isInMemoryCache = ([self.imageCache imageFromMemoryCacheForKey:key] != nil);
+    
+    if (isInMemoryCache) {
+        // making sure we call the completion block on the main queue
+        dispatch_async(dispatch_get_main_queue(), ^{
+            if (completionBlock) {
+                completionBlock(YES);
+            }
+        });
+        return;
+    }
+    
+    [self.imageCache diskImageExistsWithKey:key completion:^(BOOL isInDiskCache) {
+        // the completion block of checkDiskCacheForImageWithKey:completion: is always called on the main queue, no need to further dispatch
+        if (completionBlock) {
+            completionBlock(isInDiskCache);
+        }
+    }];
+}
+
+- (void)diskImageExistsForURL:(nullable NSURL *)url
+                   completion:(nullable SDWebImageCheckCacheCompletionBlock)completionBlock {
+    NSString *key = [self cacheKeyForURL:url];
+    
+    [self.imageCache diskImageExistsWithKey:key completion:^(BOOL isInDiskCache) {
+        // the completion block of checkDiskCacheForImageWithKey:completion: is always called on the main queue, no need to further dispatch
+        if (completionBlock) {
+            completionBlock(isInDiskCache);
+        }
+    }];
+}
+
+- (id <SDWebImageOperation>)loadImageWithURL:(nullable NSURL *)url
+                                     options:(SDWebImageOptions)options
+                                    progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                                   completed:(nullable SDInternalCompletionBlock)completedBlock {
+    // Invoking this method without a completedBlock is pointless
+    NSAssert(completedBlock != nil, @"If you mean to prefetch the image, use -[SDWebImagePrefetcher prefetchURLs] instead");
+
+    // Very common mistake is to send the URL using NSString object instead of NSURL. For some strange reason, Xcode won't
+    // throw any warning for this type mismatch. Here we failsafe this error by allowing URLs to be passed as NSString.
+    if ([url isKindOfClass:NSString.class]) {
+        url = [NSURL URLWithString:(NSString *)url];
+    }
+
+    // Prevents app crashing on argument type error like sending NSNull instead of NSURL
+    if (![url isKindOfClass:NSURL.class]) {
+        url = nil;
+    }
+
+    SDWebImageCombinedOperation *operation = [SDWebImageCombinedOperation new];
+    operation.manager = self;
+
+    BOOL isFailedUrl = NO;
+    if (url) {
+        LOCK(self.failedURLsLock);
+        isFailedUrl = [self.failedURLs containsObject:url];
+        UNLOCK(self.failedURLsLock);
+    }
+
+    if (url.absoluteString.length == 0 || (!(options & SDWebImageRetryFailed) && isFailedUrl)) {
+        [self callCompletionBlockForOperation:operation completion:completedBlock error:[NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorFileDoesNotExist userInfo:nil] url:url];
+        return operation;
+    }
+
+    LOCK(self.runningOperationsLock);
+    [self.runningOperations addObject:operation];
+    UNLOCK(self.runningOperationsLock);
+    NSString *key = [self cacheKeyForURL:url];
+    
+    SDImageCacheOptions cacheOptions = 0;
+    if (options & SDWebImageQueryDataWhenInMemory) cacheOptions |= SDImageCacheQueryDataWhenInMemory;
+    if (options & SDWebImageQueryDiskSync) cacheOptions |= SDImageCacheQueryDiskSync;
+    if (options & SDWebImageScaleDownLargeImages) cacheOptions |= SDImageCacheScaleDownLargeImages;
+    
+    __weak SDWebImageCombinedOperation *weakOperation = operation;
+    operation.cacheOperation = [self.imageCache queryCacheOperationForKey:key options:cacheOptions done:^(UIImage *cachedImage, NSData *cachedData, SDImageCacheType cacheType) {
+        __strong __typeof(weakOperation) strongOperation = weakOperation;
+        if (!strongOperation || strongOperation.isCancelled) {
+            [self safelyRemoveOperationFromRunning:strongOperation];
+            return;
+        }
+        
+        // Check whether we should download image from network
+        BOOL shouldDownload = (!(options & SDWebImageFromCacheOnly))
+            && (!cachedImage || options & SDWebImageRefreshCached)
+            && (![self.delegate respondsToSelector:@selector(imageManager:shouldDownloadImageForURL:)] || [self.delegate imageManager:self shouldDownloadImageForURL:url]);
+        if (shouldDownload) {
+            if (cachedImage && options & SDWebImageRefreshCached) {
+                // If image was found in the cache but SDWebImageRefreshCached is provided, notify about the cached image
+                // AND try to re-download it in order to let a chance to NSURLCache to refresh it from server.
+                [self callCompletionBlockForOperation:strongOperation completion:completedBlock image:cachedImage data:cachedData error:nil cacheType:cacheType finished:YES url:url];
+            }
+
+            // download if no image or requested to refresh anyway, and download allowed by delegate
+            SDWebImageDownloaderOptions downloaderOptions = 0;
+            if (options & SDWebImageLowPriority) downloaderOptions |= SDWebImageDownloaderLowPriority;
+            if (options & SDWebImageProgressiveDownload) downloaderOptions |= SDWebImageDownloaderProgressiveDownload;
+            if (options & SDWebImageRefreshCached) downloaderOptions |= SDWebImageDownloaderUseNSURLCache;
+            if (options & SDWebImageContinueInBackground) downloaderOptions |= SDWebImageDownloaderContinueInBackground;
+            if (options & SDWebImageHandleCookies) downloaderOptions |= SDWebImageDownloaderHandleCookies;
+            if (options & SDWebImageAllowInvalidSSLCertificates) downloaderOptions |= SDWebImageDownloaderAllowInvalidSSLCertificates;
+            if (options & SDWebImageHighPriority) downloaderOptions |= SDWebImageDownloaderHighPriority;
+            if (options & SDWebImageScaleDownLargeImages) downloaderOptions |= SDWebImageDownloaderScaleDownLargeImages;
+            
+            if (cachedImage && options & SDWebImageRefreshCached) {
+                // force progressive off if image already cached but forced refreshing
+                downloaderOptions &= ~SDWebImageDownloaderProgressiveDownload;
+                // ignore image read from NSURLCache if image if cached but force refreshing
+                downloaderOptions |= SDWebImageDownloaderIgnoreCachedResponse;
+            }
+            
+            // `SDWebImageCombinedOperation` -> `SDWebImageDownloadToken` -> `downloadOperationCancelToken`, which is a `SDCallbacksDictionary` and retain the completed block below, so we need weak-strong again to avoid retain cycle
+            __weak typeof(strongOperation) weakSubOperation = strongOperation;
+            strongOperation.downloadToken = [self.imageDownloader downloadImageWithURL:url options:downloaderOptions progress:progressBlock completed:^(UIImage *downloadedImage, NSData *downloadedData, NSError *error, BOOL finished) {
+                __strong typeof(weakSubOperation) strongSubOperation = weakSubOperation;
+                if (!strongSubOperation || strongSubOperation.isCancelled) {
+                    // Do nothing if the operation was cancelled
+                    // See #699 for more details
+                    // if we would call the completedBlock, there could be a race condition between this block and another completedBlock for the same object, so if this one is called second, we will overwrite the new data
+                } else if (error) {
+                    [self callCompletionBlockForOperation:strongSubOperation completion:completedBlock error:error url:url];
+                    BOOL shouldBlockFailedURL;
+                    // Check whether we should block failed url
+                    if ([self.delegate respondsToSelector:@selector(imageManager:shouldBlockFailedURL:withError:)]) {
+                        shouldBlockFailedURL = [self.delegate imageManager:self shouldBlockFailedURL:url withError:error];
+                    } else {
+                        shouldBlockFailedURL = (   error.code != NSURLErrorNotConnectedToInternet
+                                                && error.code != NSURLErrorCancelled
+                                                && error.code != NSURLErrorTimedOut
+                                                && error.code != NSURLErrorInternationalRoamingOff
+                                                && error.code != NSURLErrorDataNotAllowed
+                                                && error.code != NSURLErrorCannotFindHost
+                                                && error.code != NSURLErrorCannotConnectToHost
+                                                && error.code != NSURLErrorNetworkConnectionLost);
+                    }
+                    
+                    if (shouldBlockFailedURL) {
+                        LOCK(self.failedURLsLock);
+                        [self.failedURLs addObject:url];
+                        UNLOCK(self.failedURLsLock);
+                    }
+                }
+                else {
+                    if ((options & SDWebImageRetryFailed)) {
+                        LOCK(self.failedURLsLock);
+                        [self.failedURLs removeObject:url];
+                        UNLOCK(self.failedURLsLock);
+                    }
+                    
+                    BOOL cacheOnDisk = !(options & SDWebImageCacheMemoryOnly);
+                    
+                    // We've done the scale process in SDWebImageDownloader with the shared manager, this is used for custom manager and avoid extra scale.
+                    if (self != [SDWebImageManager sharedManager] && self.cacheKeyFilter && downloadedImage) {
+                        downloadedImage = [self scaledImageForKey:key image:downloadedImage];
+                    }
+
+                    if (options & SDWebImageRefreshCached && cachedImage && !downloadedImage) {
+                        // Image refresh hit the NSURLCache cache, do not call the completion block
+                    } else if (downloadedImage && (!downloadedImage.images || (options & SDWebImageTransformAnimatedImage)) && [self.delegate respondsToSelector:@selector(imageManager:transformDownloadedImage:withURL:)]) {
+                        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
+                            @autoreleasepool {
+                                UIImage *transformedImage = [self.delegate imageManager:self transformDownloadedImage:downloadedImage withURL:url];
+                                
+                                if (transformedImage && finished) {
+                                    BOOL imageWasTransformed = ![transformedImage isEqual:downloadedImage];
+                                    NSData *cacheData;
+                                    // pass nil if the image was transformed, so we can recalculate the data from the image
+                                    if (self.cacheSerializer) {
+                                        cacheData = self.cacheSerializer(transformedImage, (imageWasTransformed ? nil : downloadedData), url);
+                                    } else {
+                                        cacheData = (imageWasTransformed ? nil : downloadedData);
+                                    }
+                                    [self.imageCache storeImage:transformedImage imageData:cacheData forKey:key toDisk:cacheOnDisk completion:nil];
+                                }
+                                
+                                [self callCompletionBlockForOperation:strongSubOperation completion:completedBlock image:transformedImage data:downloadedData error:nil cacheType:SDImageCacheTypeNone finished:finished url:url];
+                            }
+                        });
+                    } else {
+                        if (downloadedImage && finished) {
+                            if (self.cacheSerializer) {
+                                dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
+                                    @autoreleasepool {
+                                        NSData *cacheData = self.cacheSerializer(downloadedImage, downloadedData, url);
+                                        [self.imageCache storeImage:downloadedImage imageData:cacheData forKey:key toDisk:cacheOnDisk completion:nil];
+                                    }
+                                });
+                            } else {
+                                [self.imageCache storeImage:downloadedImage imageData:downloadedData forKey:key toDisk:cacheOnDisk completion:nil];
+                            }
+                        }
+                        [self callCompletionBlockForOperation:strongSubOperation completion:completedBlock image:downloadedImage data:downloadedData error:nil cacheType:SDImageCacheTypeNone finished:finished url:url];
+                    }
+                }
+
+                if (finished) {
+                    [self safelyRemoveOperationFromRunning:strongSubOperation];
+                }
+            }];
+        } else if (cachedImage) {
+            [self callCompletionBlockForOperation:strongOperation completion:completedBlock image:cachedImage data:cachedData error:nil cacheType:cacheType finished:YES url:url];
+            [self safelyRemoveOperationFromRunning:strongOperation];
+        } else {
+            // Image not in cache and download disallowed by delegate
+            [self callCompletionBlockForOperation:strongOperation completion:completedBlock image:nil data:nil error:nil cacheType:SDImageCacheTypeNone finished:YES url:url];
+            [self safelyRemoveOperationFromRunning:strongOperation];
+        }
+    }];
+
+    return operation;
+}
+
+- (void)saveImageToCache:(nullable UIImage *)image forURL:(nullable NSURL *)url {
+    if (image && url) {
+        NSString *key = [self cacheKeyForURL:url];
+        [self.imageCache storeImage:image forKey:key toDisk:YES completion:nil];
+    }
+}
+
+- (void)cancelAll {
+    LOCK(self.runningOperationsLock);
+    NSSet<SDWebImageCombinedOperation *> *copiedOperations = [self.runningOperations copy];
+    UNLOCK(self.runningOperationsLock);
+    [copiedOperations makeObjectsPerformSelector:@selector(cancel)]; // This will call `safelyRemoveOperationFromRunning:` and remove from the array
+}
+
+- (BOOL)isRunning {
+    BOOL isRunning = NO;
+    LOCK(self.runningOperationsLock);
+    isRunning = (self.runningOperations.count > 0);
+    UNLOCK(self.runningOperationsLock);
+    return isRunning;
+}
+
+- (void)safelyRemoveOperationFromRunning:(nullable SDWebImageCombinedOperation*)operation {
+    if (!operation) {
+        return;
+    }
+    LOCK(self.runningOperationsLock);
+    [self.runningOperations removeObject:operation];
+    UNLOCK(self.runningOperationsLock);
+}
+
+- (void)callCompletionBlockForOperation:(nullable SDWebImageCombinedOperation*)operation
+                             completion:(nullable SDInternalCompletionBlock)completionBlock
+                                  error:(nullable NSError *)error
+                                    url:(nullable NSURL *)url {
+    [self callCompletionBlockForOperation:operation completion:completionBlock image:nil data:nil error:error cacheType:SDImageCacheTypeNone finished:YES url:url];
+}
+
+- (void)callCompletionBlockForOperation:(nullable SDWebImageCombinedOperation*)operation
+                             completion:(nullable SDInternalCompletionBlock)completionBlock
+                                  image:(nullable UIImage *)image
+                                   data:(nullable NSData *)data
+                                  error:(nullable NSError *)error
+                              cacheType:(SDImageCacheType)cacheType
+                               finished:(BOOL)finished
+                                    url:(nullable NSURL *)url {
+    dispatch_main_async_safe(^{
+        if (operation && !operation.isCancelled && completionBlock) {
+            completionBlock(image, data, error, cacheType, finished, url);
+        }
+    });
+}
+
+@end
+
+
+@implementation SDWebImageCombinedOperation
+
+- (void)cancel {
+    @synchronized(self) {
+        self.cancelled = YES;
+        if (self.cacheOperation) {
+            [self.cacheOperation cancel];
+            self.cacheOperation = nil;
+        }
+        if (self.downloadToken) {
+            [self.manager.imageDownloader cancel:self.downloadToken];
+        }
+        [self.manager safelyRemoveOperationFromRunning:self];
+    }
+}
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageOperation.h

@@ -0,0 +1,15 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+
+@protocol SDWebImageOperation <NSObject>
+
+- (void)cancel;
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImagePrefetcher.h

@@ -0,0 +1,112 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import <Foundation/Foundation.h>
+#import "SDWebImageManager.h"
+
+@class SDWebImagePrefetcher;
+
+@protocol SDWebImagePrefetcherDelegate <NSObject>
+
+@optional
+
+/**
+ * Called when an image was prefetched.
+ *
+ * @param imagePrefetcher The current image prefetcher
+ * @param imageURL        The image url that was prefetched
+ * @param finishedCount   The total number of images that were prefetched (successful or not)
+ * @param totalCount      The total number of images that were to be prefetched
+ */
+- (void)imagePrefetcher:(nonnull SDWebImagePrefetcher *)imagePrefetcher didPrefetchURL:(nullable NSURL *)imageURL finishedCount:(NSUInteger)finishedCount totalCount:(NSUInteger)totalCount;
+
+/**
+ * Called when all images are prefetched.
+ * @param imagePrefetcher The current image prefetcher
+ * @param totalCount      The total number of images that were prefetched (whether successful or not)
+ * @param skippedCount    The total number of images that were skipped
+ */
+- (void)imagePrefetcher:(nonnull SDWebImagePrefetcher *)imagePrefetcher didFinishWithTotalCount:(NSUInteger)totalCount skippedCount:(NSUInteger)skippedCount;
+
+@end
+
+typedef void(^SDWebImagePrefetcherProgressBlock)(NSUInteger noOfFinishedUrls, NSUInteger noOfTotalUrls);
+typedef void(^SDWebImagePrefetcherCompletionBlock)(NSUInteger noOfFinishedUrls, NSUInteger noOfSkippedUrls);
+
+/**
+ * Prefetch some URLs in the cache for future use. Images are downloaded in low priority.
+ */
+@interface SDWebImagePrefetcher : NSObject
+
+/**
+ *  The web image manager
+ */
+@property (strong, nonatomic, readonly, nonnull) SDWebImageManager *manager;
+
+/**
+ * Maximum number of URLs to prefetch at the same time. Defaults to 3.
+ */
+@property (nonatomic, assign) NSUInteger maxConcurrentDownloads;
+
+/**
+ * SDWebImageOptions for prefetcher. Defaults to SDWebImageLowPriority.
+ */
+@property (nonatomic, assign) SDWebImageOptions options;
+
+/**
+ * Queue options for Prefetcher. Defaults to Main Queue.
+ */
+@property (strong, nonatomic, nonnull) dispatch_queue_t prefetcherQueue;
+
+@property (weak, nonatomic, nullable) id <SDWebImagePrefetcherDelegate> delegate;
+
+/**
+ * Return the global image prefetcher instance.
+ */
++ (nonnull instancetype)sharedImagePrefetcher;
+
+/**
+ * Allows you to instantiate a prefetcher with any arbitrary image manager.
+ */
+- (nonnull instancetype)initWithImageManager:(nonnull SDWebImageManager *)manager NS_DESIGNATED_INITIALIZER;
+
+/**
+ * Assign list of URLs to let SDWebImagePrefetcher to queue the prefetching,
+ * currently one image is downloaded at a time,
+ * and skips images for failed downloads and proceed to the next image in the list.
+ * Any previously-running prefetch operations are canceled.
+ *
+ * @param urls list of URLs to prefetch
+ */
+- (void)prefetchURLs:(nullable NSArray<NSURL *> *)urls;
+
+/**
+ * Assign list of URLs to let SDWebImagePrefetcher to queue the prefetching,
+ * currently one image is downloaded at a time,
+ * and skips images for failed downloads and proceed to the next image in the list.
+ * Any previously-running prefetch operations are canceled.
+ *
+ * @param urls            list of URLs to prefetch
+ * @param progressBlock   block to be called when progress updates; 
+ *                        first parameter is the number of completed (successful or not) requests, 
+ *                        second parameter is the total number of images originally requested to be prefetched
+ * @param completionBlock block to be called when prefetching is completed
+ *                        first param is the number of completed (successful or not) requests,
+ *                        second parameter is the number of skipped requests
+ */
+- (void)prefetchURLs:(nullable NSArray<NSURL *> *)urls
+            progress:(nullable SDWebImagePrefetcherProgressBlock)progressBlock
+           completed:(nullable SDWebImagePrefetcherCompletionBlock)completionBlock;
+
+/**
+ * Remove and cancel queued list
+ */
+- (void)cancelPrefetching;
+
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImagePrefetcher.m

@@ -0,0 +1,144 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImagePrefetcher.h"
+
+@interface SDWebImagePrefetcher ()
+
+@property (strong, nonatomic, nonnull) SDWebImageManager *manager;
+@property (strong, atomic, nullable) NSArray<NSURL *> *prefetchURLs; // may be accessed from different queue
+@property (assign, nonatomic) NSUInteger requestedCount;
+@property (assign, nonatomic) NSUInteger skippedCount;
+@property (assign, nonatomic) NSUInteger finishedCount;
+@property (assign, nonatomic) NSTimeInterval startedTime;
+@property (copy, nonatomic, nullable) SDWebImagePrefetcherCompletionBlock completionBlock;
+@property (copy, nonatomic, nullable) SDWebImagePrefetcherProgressBlock progressBlock;
+
+@end
+
+@implementation SDWebImagePrefetcher
+
++ (nonnull instancetype)sharedImagePrefetcher {
+    static dispatch_once_t once;
+    static id instance;
+    dispatch_once(&once, ^{
+        instance = [self new];
+    });
+    return instance;
+}
+
+- (nonnull instancetype)init {
+    return [self initWithImageManager:[SDWebImageManager new]];
+}
+
+- (nonnull instancetype)initWithImageManager:(SDWebImageManager *)manager {
+    if ((self = [super init])) {
+        _manager = manager;
+        _options = SDWebImageLowPriority;
+        _prefetcherQueue = dispatch_get_main_queue();
+        self.maxConcurrentDownloads = 3;
+    }
+    return self;
+}
+
+- (void)setMaxConcurrentDownloads:(NSUInteger)maxConcurrentDownloads {
+    self.manager.imageDownloader.maxConcurrentDownloads = maxConcurrentDownloads;
+}
+
+- (NSUInteger)maxConcurrentDownloads {
+    return self.manager.imageDownloader.maxConcurrentDownloads;
+}
+
+- (void)startPrefetchingAtIndex:(NSUInteger)index {
+    NSURL *currentURL;
+    @synchronized(self) {
+        if (index >= self.prefetchURLs.count) return;
+        currentURL = self.prefetchURLs[index];
+        self.requestedCount++;
+    }
+    [self.manager loadImageWithURL:currentURL options:self.options progress:nil completed:^(UIImage *image, NSData *data, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
+        if (!finished) return;
+        self.finishedCount++;
+
+        if (self.progressBlock) {
+            self.progressBlock(self.finishedCount,(self.prefetchURLs).count);
+        }
+        if (!image) {
+            // Add last failed
+            self.skippedCount++;
+        }
+        if ([self.delegate respondsToSelector:@selector(imagePrefetcher:didPrefetchURL:finishedCount:totalCount:)]) {
+            [self.delegate imagePrefetcher:self
+                            didPrefetchURL:currentURL
+                             finishedCount:self.finishedCount
+                                totalCount:self.prefetchURLs.count
+             ];
+        }
+        if (self.prefetchURLs.count > self.requestedCount) {
+            dispatch_async(self.prefetcherQueue, ^{
+                // we need dispatch to avoid function recursion call. This can prevent stack overflow even for huge urls list
+                [self startPrefetchingAtIndex:self.requestedCount];
+            });
+        } else if (self.finishedCount == self.requestedCount) {
+            [self reportStatus];
+            if (self.completionBlock) {
+                self.completionBlock(self.finishedCount, self.skippedCount);
+                self.completionBlock = nil;
+            }
+            self.progressBlock = nil;
+        }
+    }];
+}
+
+- (void)reportStatus {
+    NSUInteger total = (self.prefetchURLs).count;
+    if ([self.delegate respondsToSelector:@selector(imagePrefetcher:didFinishWithTotalCount:skippedCount:)]) {
+        [self.delegate imagePrefetcher:self
+               didFinishWithTotalCount:(total - self.skippedCount)
+                          skippedCount:self.skippedCount
+         ];
+    }
+}
+
+- (void)prefetchURLs:(nullable NSArray<NSURL *> *)urls {
+    [self prefetchURLs:urls progress:nil completed:nil];
+}
+
+- (void)prefetchURLs:(nullable NSArray<NSURL *> *)urls
+            progress:(nullable SDWebImagePrefetcherProgressBlock)progressBlock
+           completed:(nullable SDWebImagePrefetcherCompletionBlock)completionBlock {
+    [self cancelPrefetching]; // Prevent duplicate prefetch request
+    self.startedTime = CFAbsoluteTimeGetCurrent();
+    self.prefetchURLs = urls;
+    self.completionBlock = completionBlock;
+    self.progressBlock = progressBlock;
+
+    if (urls.count == 0) {
+        if (completionBlock) {
+            completionBlock(0,0);
+        }
+    } else {
+        // Starts prefetching from the very first image on the list with the max allowed concurrency
+        NSUInteger listCount = self.prefetchURLs.count;
+        for (NSUInteger i = 0; i < self.maxConcurrentDownloads && self.requestedCount < listCount; i++) {
+            [self startPrefetchingAtIndex:i];
+        }
+    }
+}
+
+- (void)cancelPrefetching {
+    @synchronized(self) {
+        self.prefetchURLs = nil;
+        self.skippedCount = 0;
+        self.requestedCount = 0;
+        self.finishedCount = 0;
+    }
+    [self.manager cancelAll];
+}
+
+@end

Pods/SDWebImage/SDWebImage/SDWebImageTransition.h

@@ -0,0 +1,98 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+#if SD_UIKIT || SD_MAC
+#import "SDImageCache.h"
+
+// This class is used to provide a transition animation after the view category load image finished. Use this on `sd_imageTransition` in UIView+WebCache.h
+// for UIKit(iOS & tvOS), we use `+[UIView transitionWithView:duration:options:animations:completion]` for transition animation.
+// for AppKit(macOS), we use `+[NSAnimationContext runAnimationGroup:completionHandler:]` for transition animation. You can call `+[NSAnimationContext currentContext]` to grab the context during animations block.
+// These transition are provided for basic usage. If you need complicated animation, consider to directly use Core Animation or use `SDWebImageAvoidAutoSetImage` and implement your own after image load finished.
+
+#if SD_UIKIT
+typedef UIViewAnimationOptions SDWebImageAnimationOptions;
+#else
+typedef NS_OPTIONS(NSUInteger, SDWebImageAnimationOptions) {
+    SDWebImageAnimationOptionAllowsImplicitAnimation = 1 << 0, // specify `allowsImplicitAnimation` for the `NSAnimationContext`
+};
+#endif
+
+typedef void (^SDWebImageTransitionPreparesBlock)(__kindof UIView * _Nonnull view, UIImage * _Nullable image, NSData * _Nullable imageData, SDImageCacheType cacheType, NSURL * _Nullable imageURL);
+typedef void (^SDWebImageTransitionAnimationsBlock)(__kindof UIView * _Nonnull view, UIImage * _Nullable image);
+typedef void (^SDWebImageTransitionCompletionBlock)(BOOL finished);
+
+@interface SDWebImageTransition : NSObject
+
+/**
+ By default, we set the image to the view at the beginning of the animtions. You can disable this and provide custom set image process
+ */
+@property (nonatomic, assign) BOOL avoidAutoSetImage;
+/**
+ The duration of the transition animation, measured in seconds. Defaults to 0.5.
+ */
+@property (nonatomic, assign) NSTimeInterval duration;
+/**
+ The timing function used for all animations within this transition animation (macOS).
+ */
+@property (nonatomic, strong, nullable) CAMediaTimingFunction *timingFunction NS_AVAILABLE_MAC(10_7);
+/**
+ A mask of options indicating how you want to perform the animations.
+ */
+@property (nonatomic, assign) SDWebImageAnimationOptions animationOptions;
+/**
+ A block object to be executed before the animation sequence starts.
+ */
+@property (nonatomic, copy, nullable) SDWebImageTransitionPreparesBlock prepares;
+/**
+ A block object that contains the changes you want to make to the specified view.
+ */
+@property (nonatomic, copy, nullable) SDWebImageTransitionAnimationsBlock animations;
+/**
+ A block object to be executed when the animation sequence ends.
+ */
+@property (nonatomic, copy, nullable) SDWebImageTransitionCompletionBlock completion;
+
+@end
+
+// Convenience way to create transition. Remember to specify the duration if needed.
+// for UIKit, these transition just use the correspond `animationOptions`. By default we enable `UIViewAnimationOptionAllowUserInteraction` to allow user interaction during transition.
+// for AppKit, these transition use Core Animation in `animations`. So your view must be layer-backed. Set `wantsLayer = YES` before you apply it.
+
+@interface SDWebImageTransition (Conveniences)
+
+// class property is available in Xcode 8. We will drop the Xcode 7.3 support in 5.x
+#if __has_feature(objc_class_property)
+/// Fade transition.
+@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *fadeTransition;
+/// Flip from left transition.
+@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *flipFromLeftTransition;
+/// Flip from right transition.
+@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *flipFromRightTransition;
+/// Flip from top transition.
+@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *flipFromTopTransition;
+/// Flip from bottom transition.
+@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *flipFromBottomTransition;
+/// Curl up transition.
+@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *curlUpTransition;
+/// Curl down transition.
+@property (nonatomic, class, nonnull, readonly) SDWebImageTransition *curlDownTransition;
+#else
++ (nonnull instancetype)fadeTransition;
++ (nonnull instancetype)flipFromLeftTransition;
++ (nonnull instancetype)flipFromRightTransition;
++ (nonnull instancetype)flipFromTopTransition;
++ (nonnull instancetype)flipFromBottomTransition;
++ (nonnull instancetype)curlUpTransition;
++ (nonnull instancetype)curlDownTransition;
+#endif
+
+@end
+
+#endif

Pods/SDWebImage/SDWebImage/SDWebImageTransition.m

@@ -0,0 +1,137 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageTransition.h"
+
+#if SD_UIKIT || SD_MAC
+
+#if SD_MAC
+#import <QuartzCore/QuartzCore.h>
+#endif
+
+@implementation SDWebImageTransition
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        self.duration = 0.5;
+    }
+    return self;
+}
+
+@end
+
+@implementation SDWebImageTransition (Conveniences)
+
++ (SDWebImageTransition *)fadeTransition {
+    SDWebImageTransition *transition = [SDWebImageTransition new];
+#if SD_UIKIT
+    transition.animationOptions = UIViewAnimationOptionTransitionCrossDissolve | UIViewAnimationOptionAllowUserInteraction;
+#else
+    transition.animations = ^(__kindof NSView * _Nonnull view, NSImage * _Nullable image) {
+        CATransition *trans = [CATransition animation];
+        trans.type = kCATransitionFade;
+        [view.layer addAnimation:trans forKey:kCATransition];
+    };
+#endif
+    return transition;
+}
+
++ (SDWebImageTransition *)flipFromLeftTransition {
+    SDWebImageTransition *transition = [SDWebImageTransition new];
+#if SD_UIKIT
+    transition.animationOptions = UIViewAnimationOptionTransitionFlipFromLeft | UIViewAnimationOptionAllowUserInteraction;
+#else
+    transition.animations = ^(__kindof NSView * _Nonnull view, NSImage * _Nullable image) {
+        CATransition *trans = [CATransition animation];
+        trans.type = kCATransitionPush;
+        trans.subtype = kCATransitionFromLeft;
+        [view.layer addAnimation:trans forKey:kCATransition];
+    };
+#endif
+    return transition;
+}
+
++ (SDWebImageTransition *)flipFromRightTransition {
+    SDWebImageTransition *transition = [SDWebImageTransition new];
+#if SD_UIKIT
+    transition.animationOptions = UIViewAnimationOptionTransitionFlipFromRight | UIViewAnimationOptionAllowUserInteraction;
+#else
+    transition.animations = ^(__kindof NSView * _Nonnull view, NSImage * _Nullable image) {
+        CATransition *trans = [CATransition animation];
+        trans.type = kCATransitionPush;
+        trans.subtype = kCATransitionFromRight;
+        [view.layer addAnimation:trans forKey:kCATransition];
+    };
+#endif
+    return transition;
+}
+
++ (SDWebImageTransition *)flipFromTopTransition {
+    SDWebImageTransition *transition = [SDWebImageTransition new];
+#if SD_UIKIT
+    transition.animationOptions = UIViewAnimationOptionTransitionFlipFromTop | UIViewAnimationOptionAllowUserInteraction;
+#else
+    transition.animations = ^(__kindof NSView * _Nonnull view, NSImage * _Nullable image) {
+        CATransition *trans = [CATransition animation];
+        trans.type = kCATransitionPush;
+        trans.subtype = kCATransitionFromTop;
+        [view.layer addAnimation:trans forKey:kCATransition];
+    };
+#endif
+    return transition;
+}
+
++ (SDWebImageTransition *)flipFromBottomTransition {
+    SDWebImageTransition *transition = [SDWebImageTransition new];
+#if SD_UIKIT
+    transition.animationOptions = UIViewAnimationOptionTransitionFlipFromBottom | UIViewAnimationOptionAllowUserInteraction;
+#else
+    transition.animations = ^(__kindof NSView * _Nonnull view, NSImage * _Nullable image) {
+        CATransition *trans = [CATransition animation];
+        trans.type = kCATransitionPush;
+        trans.subtype = kCATransitionFromBottom;
+        [view.layer addAnimation:trans forKey:kCATransition];
+    };
+#endif
+    return transition;
+}
+
++ (SDWebImageTransition *)curlUpTransition {
+    SDWebImageTransition *transition = [SDWebImageTransition new];
+#if SD_UIKIT
+    transition.animationOptions = UIViewAnimationOptionTransitionCurlUp | UIViewAnimationOptionAllowUserInteraction;
+#else
+    transition.animations = ^(__kindof NSView * _Nonnull view, NSImage * _Nullable image) {
+        CATransition *trans = [CATransition animation];
+        trans.type = kCATransitionReveal;
+        trans.subtype = kCATransitionFromTop;
+        [view.layer addAnimation:trans forKey:kCATransition];
+    };
+#endif
+    return transition;
+}
+
++ (SDWebImageTransition *)curlDownTransition {
+    SDWebImageTransition *transition = [SDWebImageTransition new];
+#if SD_UIKIT
+    transition.animationOptions = UIViewAnimationOptionTransitionCurlDown | UIViewAnimationOptionAllowUserInteraction;
+#else
+    transition.animations = ^(__kindof NSView * _Nonnull view, NSImage * _Nullable image) {
+        CATransition *trans = [CATransition animation];
+        trans.type = kCATransitionReveal;
+        trans.subtype = kCATransitionFromBottom;
+        [view.layer addAnimation:trans forKey:kCATransition];
+    };
+#endif
+    return transition;
+}
+
+@end
+
+#endif

Pods/SDWebImage/SDWebImage/UIButton+WebCache.h

@@ -0,0 +1,255 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+#if SD_UIKIT
+
+#import "SDWebImageManager.h"
+
+/**
+ * Integrates SDWebImage async downloading and caching of remote images with UIButtonView.
+ */
+@interface UIButton (WebCache)
+
+#pragma mark - Image
+
+/**
+ * Get the current image URL.
+ */
+- (nullable NSURL *)sd_currentImageURL;
+
+/**
+ * Get the image URL for a control state.
+ * 
+ * @param state Which state you want to know the URL for. The values are described in UIControlState.
+ */
+- (nullable NSURL *)sd_imageURLForState:(UIControlState)state;
+
+/**
+ * Set the imageView `image` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url   The url for the image.
+ * @param state The state that uses the specified title. The values are described in UIControlState.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the imageView `image` with an `url` and a placeholder.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param state       The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @see sd_setImageWithURL:placeholderImage:options:
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+          placeholderImage:(nullable UIImage *)placeholder NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the imageView `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param state       The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the imageView `image` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param state          The state that uses the specified title. The values are described in UIControlState.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the imageView `image` with an `url`, placeholder.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param state          The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+          placeholderImage:(nullable UIImage *)placeholder
+                 completed:(nullable SDExternalCompletionBlock)completedBlock NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the imageView `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param state          The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+#pragma mark - Background Image
+
+/**
+ * Get the current background image URL.
+ */
+- (nullable NSURL *)sd_currentBackgroundImageURL;
+
+/**
+ * Get the background image URL for a control state.
+ * 
+ * @param state Which state you want to know the URL for. The values are described in UIControlState.
+ */
+- (nullable NSURL *)sd_backgroundImageURLForState:(UIControlState)state;
+
+/**
+ * Set the backgroundImageView `image` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url   The url for the image.
+ * @param state The state that uses the specified title. The values are described in UIControlState.
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the backgroundImageView `image` with an `url` and a placeholder.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param state       The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @see sd_setImageWithURL:placeholderImage:options:
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                    placeholderImage:(nullable UIImage *)placeholder NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the backgroundImageView `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param state       The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                    placeholderImage:(nullable UIImage *)placeholder
+                             options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the backgroundImageView `image` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param state          The state that uses the specified title. The values are described in UIControlState.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                           completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the backgroundImageView `image` with an `url`, placeholder.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param state          The state that uses the specified title. The values are described in UIControlState.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                    placeholderImage:(nullable UIImage *)placeholder
+                           completed:(nullable SDExternalCompletionBlock)completedBlock NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the backgroundImageView `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                    placeholderImage:(nullable UIImage *)placeholder
+                             options:(SDWebImageOptions)options
+                           completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+#pragma mark - Cancel
+
+/**
+ * Cancel the current image download
+ */
+- (void)sd_cancelImageLoadForState:(UIControlState)state;
+
+/**
+ * Cancel the current backgroundImage download
+ */
+- (void)sd_cancelBackgroundImageLoadForState:(UIControlState)state;
+
+@end
+
+#endif

Pods/SDWebImage/SDWebImage/UIButton+WebCache.m

@@ -0,0 +1,181 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIButton+WebCache.h"
+
+#if SD_UIKIT
+
+#import "objc/runtime.h"
+#import "UIView+WebCacheOperation.h"
+#import "UIView+WebCache.h"
+
+static char imageURLStorageKey;
+
+typedef NSMutableDictionary<NSString *, NSURL *> SDStateImageURLDictionary;
+
+static inline NSString * imageURLKeyForState(UIControlState state) {
+    return [NSString stringWithFormat:@"image_%lu", (unsigned long)state];
+}
+
+static inline NSString * backgroundImageURLKeyForState(UIControlState state) {
+    return [NSString stringWithFormat:@"backgroundImage_%lu", (unsigned long)state];
+}
+
+static inline NSString * imageOperationKeyForState(UIControlState state) {
+    return [NSString stringWithFormat:@"UIButtonImageOperation%lu", (unsigned long)state];
+}
+
+static inline NSString * backgroundImageOperationKeyForState(UIControlState state) {
+    return [NSString stringWithFormat:@"UIButtonBackgroundImageOperation%lu", (unsigned long)state];
+}
+
+@implementation UIButton (WebCache)
+
+#pragma mark - Image
+
+- (nullable NSURL *)sd_currentImageURL {
+    NSURL *url = self.sd_imageURLStorage[imageURLKeyForState(self.state)];
+
+    if (!url) {
+        url = self.sd_imageURLStorage[imageURLKeyForState(UIControlStateNormal)];
+    }
+
+    return url;
+}
+
+- (nullable NSURL *)sd_imageURLForState:(UIControlState)state {
+    return self.sd_imageURLStorage[imageURLKeyForState(state)];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state {
+    [self sd_setImageWithURL:url forState:state placeholderImage:nil options:0 completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder {
+    [self sd_setImageWithURL:url forState:state placeholderImage:placeholder options:0 completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
+    [self sd_setImageWithURL:url forState:state placeholderImage:placeholder options:options completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url forState:state placeholderImage:nil options:0 completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url forState:state placeholderImage:placeholder options:0 completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                  forState:(UIControlState)state
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                 completed:(nullable SDExternalCompletionBlock)completedBlock {
+    if (!url) {
+        [self.sd_imageURLStorage removeObjectForKey:imageURLKeyForState(state)];
+    } else {
+        self.sd_imageURLStorage[imageURLKeyForState(state)] = url;
+    }
+    
+    __weak typeof(self)weakSelf = self;
+    [self sd_internalSetImageWithURL:url
+                    placeholderImage:placeholder
+                             options:options
+                        operationKey:imageOperationKeyForState(state)
+                       setImageBlock:^(UIImage *image, NSData *imageData) {
+                           [weakSelf setImage:image forState:state];
+                       }
+                            progress:nil
+                           completed:completedBlock];
+}
+
+#pragma mark - Background Image
+
+- (nullable NSURL *)sd_currentBackgroundImageURL {
+    NSURL *url = self.sd_imageURLStorage[backgroundImageURLKeyForState(self.state)];
+    
+    if (!url) {
+        url = self.sd_imageURLStorage[backgroundImageURLKeyForState(UIControlStateNormal)];
+    }
+    
+    return url;
+}
+
+- (nullable NSURL *)sd_backgroundImageURLForState:(UIControlState)state {
+    return self.sd_imageURLStorage[backgroundImageURLKeyForState(state)];
+}
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state {
+    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:nil options:0 completed:nil];
+}
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder {
+    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:placeholder options:0 completed:nil];
+}
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
+    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:placeholder options:options completed:nil];
+}
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:nil options:0 completed:completedBlock];
+}
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url forState:(UIControlState)state placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setBackgroundImageWithURL:url forState:state placeholderImage:placeholder options:0 completed:completedBlock];
+}
+
+- (void)sd_setBackgroundImageWithURL:(nullable NSURL *)url
+                            forState:(UIControlState)state
+                    placeholderImage:(nullable UIImage *)placeholder
+                             options:(SDWebImageOptions)options
+                           completed:(nullable SDExternalCompletionBlock)completedBlock {
+    if (!url) {
+        [self.sd_imageURLStorage removeObjectForKey:backgroundImageURLKeyForState(state)];
+    } else {
+        self.sd_imageURLStorage[backgroundImageURLKeyForState(state)] = url;
+    }
+    
+    __weak typeof(self)weakSelf = self;
+    [self sd_internalSetImageWithURL:url
+                    placeholderImage:placeholder
+                             options:options
+                        operationKey:backgroundImageOperationKeyForState(state)
+                       setImageBlock:^(UIImage *image, NSData *imageData) {
+                           [weakSelf setBackgroundImage:image forState:state];
+                       }
+                            progress:nil
+                           completed:completedBlock];
+}
+
+#pragma mark - Cancel
+
+- (void)sd_cancelImageLoadForState:(UIControlState)state {
+    [self sd_cancelImageLoadOperationWithKey:imageOperationKeyForState(state)];
+}
+
+- (void)sd_cancelBackgroundImageLoadForState:(UIControlState)state {
+    [self sd_cancelImageLoadOperationWithKey:backgroundImageOperationKeyForState(state)];
+}
+
+#pragma mark - Private
+
+- (SDStateImageURLDictionary *)sd_imageURLStorage {
+    SDStateImageURLDictionary *storage = objc_getAssociatedObject(self, &imageURLStorageKey);
+    if (!storage) {
+        storage = [NSMutableDictionary dictionary];
+        objc_setAssociatedObject(self, &imageURLStorageKey, storage, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    }
+
+    return storage;
+}
+
+@end
+
+#endif

Pods/SDWebImage/SDWebImage/UIImage+ForceDecode.h

@@ -0,0 +1,17 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+@interface UIImage (ForceDecode)
+
++ (nullable UIImage *)decodedImageWithImage:(nullable UIImage *)image;
+
++ (nullable UIImage *)decodedAndScaledDownImageWithImage:(nullable UIImage *)image;
+
+@end

Pods/SDWebImage/SDWebImage/UIImage+ForceDecode.m

@@ -0,0 +1,30 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIImage+ForceDecode.h"
+#import "SDWebImageCodersManager.h"
+
+@implementation UIImage (ForceDecode)
+
++ (UIImage *)decodedImageWithImage:(UIImage *)image {
+    if (!image) {
+        return nil;
+    }
+    NSData *tempData;
+    return [[SDWebImageCodersManager sharedInstance] decompressedImageWithImage:image data:&tempData options:@{SDWebImageCoderScaleDownLargeImagesKey: @(NO)}];
+}
+
++ (UIImage *)decodedAndScaledDownImageWithImage:(UIImage *)image {
+    if (!image) {
+        return nil;
+    }
+    NSData *tempData;
+    return [[SDWebImageCodersManager sharedInstance] decompressedImageWithImage:image data:&tempData options:@{SDWebImageCoderScaleDownLargeImagesKey: @(YES)}];
+}
+
+@end

Pods/SDWebImage/SDWebImage/UIImage+GIF.h

@@ -0,0 +1,25 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Laurin Brandner
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+@interface UIImage (GIF)
+
+/**
+ *  Creates an animated UIImage from an NSData.
+ *  For static GIF, will create an UIImage with `images` array set to nil. For animated GIF, will create an UIImage with valid `images` array.
+ */
++ (UIImage *)sd_animatedGIFWithData:(NSData *)data;
+
+/**
+ *  Checks if an UIImage instance is a GIF. Will use the `images` array.
+ */
+- (BOOL)isGIF;
+
+@end

Pods/SDWebImage/SDWebImage/UIImage+GIF.m

@@ -0,0 +1,27 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ * (c) Laurin Brandner
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIImage+GIF.h"
+#import "SDWebImageGIFCoder.h"
+#import "NSImage+WebCache.h"
+
+@implementation UIImage (GIF)
+
++ (UIImage *)sd_animatedGIFWithData:(NSData *)data {
+    if (!data) {
+        return nil;
+    }
+    return [[SDWebImageGIFCoder sharedCoder] decodedImageWithData:data];
+}
+
+- (BOOL)isGIF {
+    return (self.images != nil);
+}
+
+@end

Pods/SDWebImage/SDWebImage/UIImage+MultiFormat.h

@@ -0,0 +1,37 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import "NSData+ImageContentType.h"
+
+@interface UIImage (MultiFormat)
+
+/**
+ * UIKit:
+ * For static image format, this value is always 0.
+ * For animated image format, 0 means infinite looping.
+ * @note Note that because of the limitations of categories this property can get out of sync if you create another instance with CGImage or other methods.
+ * AppKit:
+ * NSImage currently only support animated via GIF imageRep unlike UIImage.
+ * The getter of this property will get the loop count from GIF imageRep
+ * The setter of this property will set the loop count from GIF imageRep
+ */
+@property (nonatomic, assign) NSUInteger sd_imageLoopCount;
+
+/**
+ * The image format represent the original compressed image data format.
+ * If you don't manually specify a format, this information is retrieve from CGImage using `CGImageGetUTType`, which may return nil for non-CG based image. At this time it will return `SDImageFormatUndefined` as default value.
+ * @note Note that because of the limitations of categories this property can get out of sync if you create another instance with CGImage or other methods.
+ */
+@property (nonatomic, assign) SDImageFormat sd_imageFormat;
+
++ (nullable UIImage *)sd_imageWithData:(nullable NSData *)data;
+- (nullable NSData *)sd_imageData;
+- (nullable NSData *)sd_imageDataAsFormat:(SDImageFormat)imageFormat;
+
+@end

Pods/SDWebImage/SDWebImage/UIImage+MultiFormat.m

@@ -0,0 +1,95 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIImage+MultiFormat.h"
+#import "NSImage+WebCache.h"
+#import "SDWebImageCodersManager.h"
+#import "objc/runtime.h"
+
+@implementation UIImage (MultiFormat)
+
+#if SD_MAC
+- (NSUInteger)sd_imageLoopCount {
+    NSUInteger imageLoopCount = 0;
+    for (NSImageRep *rep in self.representations) {
+        if ([rep isKindOfClass:[NSBitmapImageRep class]]) {
+            NSBitmapImageRep *bitmapRep = (NSBitmapImageRep *)rep;
+            imageLoopCount = [[bitmapRep valueForProperty:NSImageLoopCount] unsignedIntegerValue];
+            break;
+        }
+    }
+    return imageLoopCount;
+}
+
+- (void)setSd_imageLoopCount:(NSUInteger)sd_imageLoopCount {
+    for (NSImageRep *rep in self.representations) {
+        if ([rep isKindOfClass:[NSBitmapImageRep class]]) {
+            NSBitmapImageRep *bitmapRep = (NSBitmapImageRep *)rep;
+            [bitmapRep setProperty:NSImageLoopCount withValue:@(sd_imageLoopCount)];
+            break;
+        }
+    }
+}
+
+#else
+
+- (NSUInteger)sd_imageLoopCount {
+    NSUInteger imageLoopCount = 0;
+    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_imageLoopCount));
+    if ([value isKindOfClass:[NSNumber class]]) {
+        imageLoopCount = value.unsignedIntegerValue;
+    }
+    return imageLoopCount;
+}
+
+- (void)setSd_imageLoopCount:(NSUInteger)sd_imageLoopCount {
+    NSNumber *value = @(sd_imageLoopCount);
+    objc_setAssociatedObject(self, @selector(sd_imageLoopCount), value, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+#endif
+
+- (SDImageFormat)sd_imageFormat {
+    SDImageFormat imageFormat = SDImageFormatUndefined;
+    NSNumber *value = objc_getAssociatedObject(self, @selector(sd_imageFormat));
+    if ([value isKindOfClass:[NSNumber class]]) {
+        imageFormat = value.integerValue;
+        return imageFormat;
+    }
+    // Check CGImage's UTType, may return nil for non-Image/IO based image
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunguarded-availability"
+    if (&CGImageGetUTType != NULL) {
+        CFStringRef uttype = CGImageGetUTType(self.CGImage);
+        imageFormat = [NSData sd_imageFormatFromUTType:uttype];
+    }
+#pragma clang diagnostic pop
+    return imageFormat;
+}
+
+- (void)setSd_imageFormat:(SDImageFormat)sd_imageFormat {
+    objc_setAssociatedObject(self, @selector(sd_imageFormat), @(sd_imageFormat), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
++ (nullable UIImage *)sd_imageWithData:(nullable NSData *)data {
+    return [[SDWebImageCodersManager sharedInstance] decodedImageWithData:data];
+}
+
+- (nullable NSData *)sd_imageData {
+    return [self sd_imageDataAsFormat:SDImageFormatUndefined];
+}
+
+- (nullable NSData *)sd_imageDataAsFormat:(SDImageFormat)imageFormat {
+    NSData *imageData = nil;
+    if (self) {
+        imageData = [[SDWebImageCodersManager sharedInstance] encodedDataWithImage:self format:imageFormat];
+    }
+    return imageData;
+}
+
+
+@end

Pods/SDWebImage/SDWebImage/UIImageView+HighlightedWebCache.h

@@ -0,0 +1,94 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+
+#if SD_UIKIT
+
+#import "SDWebImageManager.h"
+
+/**
+ * Integrates SDWebImage async downloading and caching of remote images with UIImageView for highlighted state.
+ */
+@interface UIImageView (HighlightedWebCache)
+
+/**
+ * Set the imageView `highlightedImage` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url The url for the image.
+ */
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the imageView `highlightedImage` with an `url` and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url     The url for the image.
+ * @param options The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ */
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url
+                              options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the imageView `highlightedImage` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url
+                            completed:(nullable SDExternalCompletionBlock)completedBlock NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the imageView `highlightedImage` with an `url` and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url
+                              options:(SDWebImageOptions)options
+                            completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the imageView `highlightedImage` with an `url` and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url
+                              options:(SDWebImageOptions)options
+                             progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                            completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+@end
+
+#endif

Pods/SDWebImage/SDWebImage/UIImageView+HighlightedWebCache.m

@@ -0,0 +1,52 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIImageView+HighlightedWebCache.h"
+
+#if SD_UIKIT
+
+#import "UIView+WebCacheOperation.h"
+#import "UIView+WebCache.h"
+
+@implementation UIImageView (HighlightedWebCache)
+
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url {
+    [self sd_setHighlightedImageWithURL:url options:0 progress:nil completed:nil];
+}
+
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url options:(SDWebImageOptions)options {
+    [self sd_setHighlightedImageWithURL:url options:options progress:nil completed:nil];
+}
+
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setHighlightedImageWithURL:url options:0 progress:nil completed:completedBlock];
+}
+
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url options:(SDWebImageOptions)options completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setHighlightedImageWithURL:url options:options progress:nil completed:completedBlock];
+}
+
+- (void)sd_setHighlightedImageWithURL:(nullable NSURL *)url
+                              options:(SDWebImageOptions)options
+                             progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                            completed:(nullable SDExternalCompletionBlock)completedBlock {
+    __weak typeof(self)weakSelf = self;
+    [self sd_internalSetImageWithURL:url
+                    placeholderImage:nil
+                             options:options
+                        operationKey:@"UIImageViewImageOperationHighlighted"
+                       setImageBlock:^(UIImage *image, NSData *imageData) {
+                           weakSelf.highlightedImage = image;
+                       }
+                            progress:progressBlock
+                           completed:completedBlock];
+}
+
+@end
+
+#endif

Pods/SDWebImage/SDWebImage/UIImageView+WebCache.h

@@ -0,0 +1,193 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import "SDWebImageManager.h"
+
+/**
+ * Integrates SDWebImage async downloading and caching of remote images with UIImageView.
+ *
+ * Usage with a UITableViewCell sub-class:
+ *
+ * @code
+
+#import <SDWebImage/UIImageView+WebCache.h>
+
+...
+
+- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    static NSString *MyIdentifier = @"MyIdentifier";
+ 
+    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
+ 
+    if (cell == nil) {
+        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier];
+    }
+ 
+    // Here we use the provided sd_setImageWithURL: method to load the web image
+    // Ensure you use a placeholder image otherwise cells will be initialized with no image
+    [cell.imageView sd_setImageWithURL:[NSURL URLWithString:@"http://example.com/image.jpg"]
+                      placeholderImage:[UIImage imageNamed:@"placeholder"]];
+ 
+    cell.textLabel.text = @"My Text";
+    return cell;
+}
+
+ * @endcode
+ */
+@interface UIImageView (WebCache)
+
+/**
+ * Set the imageView `image` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url The url for the image.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the imageView `image` with an `url` and a placeholder.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @see sd_setImageWithURL:placeholderImage:options:
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the imageView `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url         The url for the image.
+ * @param placeholder The image to be set initially, until the image request finishes.
+ * @param options     The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the imageView `image` with an `url`.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the imageView `image` with an `url`, placeholder.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                 completed:(nullable SDExternalCompletionBlock)completedBlock NS_REFINED_FOR_SWIFT;
+
+/**
+ * Set the imageView `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the imageView `image` with an `url`, placeholder and custom options.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the imageView `image` with an `url` and custom options. The placeholder image is from previous cached image and will use the provided one instead if the query failed.
+ * This method was designed to ensure that placeholder and query cache process happened in the same runloop to avoid flashing on cell during two `setImage:` call. But it's really misunderstanding and deprecated.
+ * This can be done by using `sd_setImageWithURL:` with `SDWebImageQueryDiskSync`. But take care that if the memory cache missed, query disk cache synchronously may reduce the frame rate
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ * @deprecated consider using `SDWebImageQueryDiskSync` options with `sd_setImageWithURL:` instead
+ */
+- (void)sd_setImageWithPreviousCachedImageWithURL:(nullable NSURL *)url
+                                 placeholderImage:(nullable UIImage *)placeholder
+                                          options:(SDWebImageOptions)options
+                                         progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                                        completed:(nullable SDExternalCompletionBlock)completedBlock __deprecated_msg("This method is misunderstanding and deprecated, consider using `SDWebImageQueryDiskSync` options with `sd_setImageWithURL:` instead");
+
+#if SD_UIKIT
+
+#pragma mark - Animation of multiple images
+
+/**
+ * Download an array of images and starts them in an animation loop
+ *
+ * @param arrayOfURLs An array of NSURL
+ */
+- (void)sd_setAnimationImagesWithURLs:(nonnull NSArray<NSURL *> *)arrayOfURLs;
+
+- (void)sd_cancelCurrentAnimationImagesLoad;
+
+#endif
+
+@end

Pods/SDWebImage/SDWebImage/UIImageView+WebCache.m

@@ -0,0 +1,139 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIImageView+WebCache.h"
+#import "objc/runtime.h"
+#import "UIView+WebCacheOperation.h"
+#import "UIView+WebCache.h"
+
+@implementation UIImageView (WebCache)
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url {
+    [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:nil];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:nil options:0 progress:nil completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:0 progress:nil completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url placeholderImage:(nullable UIImage *)placeholder options:(SDWebImageOptions)options completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_setImageWithURL:url placeholderImage:placeholder options:options progress:nil completed:completedBlock];
+}
+
+- (void)sd_setImageWithURL:(nullable NSURL *)url
+          placeholderImage:(nullable UIImage *)placeholder
+                   options:(SDWebImageOptions)options
+                  progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                 completed:(nullable SDExternalCompletionBlock)completedBlock {
+    [self sd_internalSetImageWithURL:url
+                    placeholderImage:placeholder
+                             options:options
+                        operationKey:nil
+                       setImageBlock:nil
+                            progress:progressBlock
+                           completed:completedBlock];
+}
+
+- (void)sd_setImageWithPreviousCachedImageWithURL:(nullable NSURL *)url
+                                 placeholderImage:(nullable UIImage *)placeholder
+                                          options:(SDWebImageOptions)options
+                                         progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                                        completed:(nullable SDExternalCompletionBlock)completedBlock {
+    NSString *key = [[SDWebImageManager sharedManager] cacheKeyForURL:url];
+    UIImage *lastPreviousCachedImage = [[SDImageCache sharedImageCache] imageFromCacheForKey:key];
+    
+    [self sd_setImageWithURL:url placeholderImage:lastPreviousCachedImage ?: placeholder options:options progress:progressBlock completed:completedBlock];    
+}
+
+#if SD_UIKIT
+
+#pragma mark - Animation of multiple images
+
+- (void)sd_setAnimationImagesWithURLs:(nonnull NSArray<NSURL *> *)arrayOfURLs {
+    [self sd_cancelCurrentAnimationImagesLoad];
+    NSPointerArray *operationsArray = [self sd_animationOperationArray];
+    
+    [arrayOfURLs enumerateObjectsUsingBlock:^(NSURL *logoImageURL, NSUInteger idx, BOOL * _Nonnull stop) {
+        __weak __typeof(self) wself = self;
+        id <SDWebImageOperation> operation = [[SDWebImageManager sharedManager] loadImageWithURL:logoImageURL options:0 progress:nil completed:^(UIImage *image, NSData *data, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
+            __strong typeof(wself) sself = wself;
+            if (!sself) return;
+            dispatch_main_async_safe(^{
+                [sself stopAnimating];
+                if (sself && image) {
+                    NSMutableArray<UIImage *> *currentImages = [[sself animationImages] mutableCopy];
+                    if (!currentImages) {
+                        currentImages = [[NSMutableArray alloc] init];
+                    }
+                    
+                    // We know what index objects should be at when they are returned so
+                    // we will put the object at the index, filling any empty indexes
+                    // with the image that was returned too "early". These images will
+                    // be overwritten. (does not require additional sorting datastructure)
+                    while ([currentImages count] < idx) {
+                        [currentImages addObject:image];
+                    }
+                    
+                    currentImages[idx] = image;
+
+                    sself.animationImages = currentImages;
+                    [sself setNeedsLayout];
+                }
+                [sself startAnimating];
+            });
+        }];
+        @synchronized (self) {
+            [operationsArray addPointer:(__bridge void *)(operation)];
+        }
+    }];
+}
+
+static char animationLoadOperationKey;
+
+// element is weak because operation instance is retained by SDWebImageManager's runningOperations property
+// we should use lock to keep thread-safe because these method may not be acessed from main queue
+- (NSPointerArray *)sd_animationOperationArray {
+    @synchronized(self) {
+        NSPointerArray *operationsArray = objc_getAssociatedObject(self, &animationLoadOperationKey);
+        if (operationsArray) {
+            return operationsArray;
+        }
+        operationsArray = [NSPointerArray weakObjectsPointerArray];
+        objc_setAssociatedObject(self, &animationLoadOperationKey, operationsArray, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+        return operationsArray;
+    }
+}
+
+- (void)sd_cancelCurrentAnimationImagesLoad {
+    NSPointerArray *operationsArray = [self sd_animationOperationArray];
+    if (operationsArray) {
+        @synchronized (self) {
+            for (id operation in operationsArray) {
+                if ([operation conformsToProtocol:@protocol(SDWebImageOperation)]) {
+                    [operation cancel];
+                }
+            }
+            operationsArray.count = 0;
+        }
+    }
+}
+#endif
+
+@end

Pods/SDWebImage/SDWebImage/UIView+WebCache.h

@@ -0,0 +1,139 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import "SDWebImageManager.h"
+#import "SDWebImageTransition.h"
+
+/**
+ A Dispatch group to maintain setImageBlock and completionBlock. This key should be used only internally and may be changed in the future. (dispatch_group_t)
+ */
+FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageInternalSetImageGroupKey;
+/**
+ A SDWebImageManager instance to control the image download and cache process using in UIImageView+WebCache category and likes. If not provided, use the shared manager (SDWebImageManager)
+ */
+FOUNDATION_EXPORT NSString * _Nonnull const SDWebImageExternalCustomManagerKey;
+/**
+ The value specify that the image progress unit count cannot be determined because the progressBlock is not been called.
+ */
+FOUNDATION_EXPORT const int64_t SDWebImageProgressUnitCountUnknown; /* 1LL */
+
+typedef void(^SDSetImageBlock)(UIImage * _Nullable image, NSData * _Nullable imageData);
+
+@interface UIView (WebCache)
+
+/**
+ * Get the current image URL.
+ *
+ * @note Note that because of the limitations of categories this property can get out of sync if you use setImage: directly.
+ */
+- (nullable NSURL *)sd_imageURL;
+
+/**
+ * The current image loading progress associated to the view. The unit count is the received size and excepted size of download.
+ * The `totalUnitCount` and `completedUnitCount` will be reset to 0 after a new image loading start (change from current queue). And they will be set to `SDWebImageProgressUnitCountUnknown` if the progressBlock not been called but the image loading success to mark the progress finished (change from main queue).
+ * @note You can use Key-Value Observing on the progress, but you should take care that the change to progress is from a background queue during download(the same as progressBlock). If you want to using KVO and update the UI, make sure to dispatch on the main queue. And it's recommand to use some KVO libs like KVOController because it's more safe and easy to use.
+ * @note The getter will create a progress instance if the value is nil. You can also set a custom progress instance and let it been updated during image loading
+ * @note Note that because of the limitations of categories this property can get out of sync if you update the progress directly.
+ */
+@property (nonatomic, strong, null_resettable) NSProgress *sd_imageProgress;
+
+/**
+ * Set the imageView `image` with an `url` and optionally a placeholder image.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param operationKey   A string to be used as the operation key. If nil, will use the class name
+ * @param setImageBlock  Block used for custom set image code
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ */
+- (void)sd_internalSetImageWithURL:(nullable NSURL *)url
+                  placeholderImage:(nullable UIImage *)placeholder
+                           options:(SDWebImageOptions)options
+                      operationKey:(nullable NSString *)operationKey
+                     setImageBlock:(nullable SDSetImageBlock)setImageBlock
+                          progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                         completed:(nullable SDExternalCompletionBlock)completedBlock;
+
+/**
+ * Set the imageView `image` with an `url` and optionally a placeholder image.
+ *
+ * The download is asynchronous and cached.
+ *
+ * @param url            The url for the image.
+ * @param placeholder    The image to be set initially, until the image request finishes.
+ * @param options        The options to use when downloading the image. @see SDWebImageOptions for the possible values.
+ * @param operationKey   A string to be used as the operation key. If nil, will use the class name
+ * @param setImageBlock  Block used for custom set image code
+ * @param progressBlock  A block called while image is downloading
+ *                       @note the progress block is executed on a background queue
+ * @param completedBlock A block called when operation has been completed. This block has no return value
+ *                       and takes the requested UIImage as first parameter. In case of error the image parameter
+ *                       is nil and the second parameter may contain an NSError. The third parameter is a Boolean
+ *                       indicating if the image was retrieved from the local cache or from the network.
+ *                       The fourth parameter is the original image url.
+ * @param context        A context with extra information to perform specify changes or processes.
+ */
+- (void)sd_internalSetImageWithURL:(nullable NSURL *)url
+                  placeholderImage:(nullable UIImage *)placeholder
+                           options:(SDWebImageOptions)options
+                      operationKey:(nullable NSString *)operationKey
+                     setImageBlock:(nullable SDSetImageBlock)setImageBlock
+                          progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                         completed:(nullable SDExternalCompletionBlock)completedBlock
+                           context:(nullable NSDictionary<NSString *, id> *)context;
+
+/**
+ * Cancel the current image load
+ */
+- (void)sd_cancelCurrentImageLoad;
+
+#if SD_UIKIT || SD_MAC
+
+#pragma mark - Image Transition
+
+/**
+ The image transition when image load finished. See `SDWebImageTransition`.
+ If you specify nil, do not do transition. Defautls to nil.
+ */
+@property (nonatomic, strong, nullable) SDWebImageTransition *sd_imageTransition;
+
+#if SD_UIKIT
+
+#pragma mark - Activity indicator
+
+/**
+ *  Show activity UIActivityIndicatorView
+ */
+- (void)sd_setShowActivityIndicatorView:(BOOL)show;
+
+/**
+ *  set desired UIActivityIndicatorViewStyle
+ *
+ *  @param style The style of the UIActivityIndicatorView
+ */
+- (void)sd_setIndicatorStyle:(UIActivityIndicatorViewStyle)style;
+
+- (BOOL)sd_showActivityIndicatorView;
+- (void)sd_addActivityIndicator;
+- (void)sd_removeActivityIndicator;
+
+#endif
+
+#endif
+
+@end

Pods/SDWebImage/SDWebImage/UIView+WebCache.m

@@ -0,0 +1,366 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIView+WebCache.h"
+#import "objc/runtime.h"
+#import "UIView+WebCacheOperation.h"
+
+NSString * const SDWebImageInternalSetImageGroupKey = @"internalSetImageGroup";
+NSString * const SDWebImageExternalCustomManagerKey = @"externalCustomManager";
+
+const int64_t SDWebImageProgressUnitCountUnknown = 1LL;
+
+static char imageURLKey;
+
+#if SD_UIKIT
+static char TAG_ACTIVITY_INDICATOR;
+static char TAG_ACTIVITY_STYLE;
+static char TAG_ACTIVITY_SHOW;
+#endif
+
+@implementation UIView (WebCache)
+
+- (nullable NSURL *)sd_imageURL {
+    return objc_getAssociatedObject(self, &imageURLKey);
+}
+
+- (NSProgress *)sd_imageProgress {
+    NSProgress *progress = objc_getAssociatedObject(self, @selector(sd_imageProgress));
+    if (!progress) {
+        progress = [[NSProgress alloc] initWithParent:nil userInfo:nil];
+        self.sd_imageProgress = progress;
+    }
+    return progress;
+}
+
+- (void)setSd_imageProgress:(NSProgress *)sd_imageProgress {
+    objc_setAssociatedObject(self, @selector(sd_imageProgress), sd_imageProgress, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
+- (void)sd_internalSetImageWithURL:(nullable NSURL *)url
+                  placeholderImage:(nullable UIImage *)placeholder
+                           options:(SDWebImageOptions)options
+                      operationKey:(nullable NSString *)operationKey
+                     setImageBlock:(nullable SDSetImageBlock)setImageBlock
+                          progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                         completed:(nullable SDExternalCompletionBlock)completedBlock {
+    return [self sd_internalSetImageWithURL:url placeholderImage:placeholder options:options operationKey:operationKey setImageBlock:setImageBlock progress:progressBlock completed:completedBlock context:nil];
+}
+
+- (void)sd_internalSetImageWithURL:(nullable NSURL *)url
+                  placeholderImage:(nullable UIImage *)placeholder
+                           options:(SDWebImageOptions)options
+                      operationKey:(nullable NSString *)operationKey
+                     setImageBlock:(nullable SDSetImageBlock)setImageBlock
+                          progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+                         completed:(nullable SDExternalCompletionBlock)completedBlock
+                           context:(nullable NSDictionary<NSString *, id> *)context {
+    NSString *validOperationKey = operationKey ?: NSStringFromClass([self class]);
+    [self sd_cancelImageLoadOperationWithKey:validOperationKey];
+    objc_setAssociatedObject(self, &imageURLKey, url, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    
+    dispatch_group_t group = context[SDWebImageInternalSetImageGroupKey];
+    if (!(options & SDWebImageDelayPlaceholder)) {
+        if (group) {
+            dispatch_group_enter(group);
+        }
+        dispatch_main_async_safe(^{
+            [self sd_setImage:placeholder imageData:nil basedOnClassOrViaCustomSetImageBlock:setImageBlock];
+        });
+    }
+    
+    if (url) {
+#if SD_UIKIT
+        // check if activityView is enabled or not
+        if ([self sd_showActivityIndicatorView]) {
+            [self sd_addActivityIndicator];
+        }
+#endif
+        
+        // reset the progress
+        self.sd_imageProgress.totalUnitCount = 0;
+        self.sd_imageProgress.completedUnitCount = 0;
+        
+        SDWebImageManager *manager = [context objectForKey:SDWebImageExternalCustomManagerKey];
+        if (!manager) {
+            manager = [SDWebImageManager sharedManager];
+        }
+        
+        __weak __typeof(self)wself = self;
+        SDWebImageDownloaderProgressBlock combinedProgressBlock = ^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
+            wself.sd_imageProgress.totalUnitCount = expectedSize;
+            wself.sd_imageProgress.completedUnitCount = receivedSize;
+            if (progressBlock) {
+                progressBlock(receivedSize, expectedSize, targetURL);
+            }
+        };
+        id <SDWebImageOperation> operation = [manager loadImageWithURL:url options:options progress:combinedProgressBlock completed:^(UIImage *image, NSData *data, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
+            __strong __typeof (wself) sself = wself;
+            if (!sself) { return; }
+#if SD_UIKIT
+            [sself sd_removeActivityIndicator];
+#endif
+            // if the progress not been updated, mark it to complete state
+            if (finished && !error && sself.sd_imageProgress.totalUnitCount == 0 && sself.sd_imageProgress.completedUnitCount == 0) {
+                sself.sd_imageProgress.totalUnitCount = SDWebImageProgressUnitCountUnknown;
+                sself.sd_imageProgress.completedUnitCount = SDWebImageProgressUnitCountUnknown;
+            }
+            BOOL shouldCallCompletedBlock = finished || (options & SDWebImageAvoidAutoSetImage);
+            BOOL shouldNotSetImage = ((image && (options & SDWebImageAvoidAutoSetImage)) ||
+                                      (!image && !(options & SDWebImageDelayPlaceholder)));
+            SDWebImageNoParamsBlock callCompletedBlockClojure = ^{
+                if (!sself) { return; }
+                if (!shouldNotSetImage) {
+                    [sself sd_setNeedsLayout];
+                }
+                if (completedBlock && shouldCallCompletedBlock) {
+                    completedBlock(image, error, cacheType, url);
+                }
+            };
+            
+            // case 1a: we got an image, but the SDWebImageAvoidAutoSetImage flag is set
+            // OR
+            // case 1b: we got no image and the SDWebImageDelayPlaceholder is not set
+            if (shouldNotSetImage) {
+                dispatch_main_async_safe(callCompletedBlockClojure);
+                return;
+            }
+            
+            UIImage *targetImage = nil;
+            NSData *targetData = nil;
+            if (image) {
+                // case 2a: we got an image and the SDWebImageAvoidAutoSetImage is not set
+                targetImage = image;
+                targetData = data;
+            } else if (options & SDWebImageDelayPlaceholder) {
+                // case 2b: we got no image and the SDWebImageDelayPlaceholder flag is set
+                targetImage = placeholder;
+                targetData = nil;
+            }
+            
+#if SD_UIKIT || SD_MAC
+            // check whether we should use the image transition
+            SDWebImageTransition *transition = nil;
+            if (finished && (options & SDWebImageForceTransition || cacheType == SDImageCacheTypeNone)) {
+                transition = sself.sd_imageTransition;
+            }
+#endif
+            dispatch_main_async_safe(^{
+                if (group) {
+                    dispatch_group_enter(group);
+                }
+#if SD_UIKIT || SD_MAC
+                [sself sd_setImage:targetImage imageData:targetData basedOnClassOrViaCustomSetImageBlock:setImageBlock transition:transition cacheType:cacheType imageURL:imageURL];
+#else
+                [sself sd_setImage:targetImage imageData:targetData basedOnClassOrViaCustomSetImageBlock:setImageBlock];
+#endif
+                if (group) {
+                    // compatible code for FLAnimatedImage, because we assume completedBlock called after image was set. This will be removed in 5.x
+                    BOOL shouldUseGroup = [objc_getAssociatedObject(group, &SDWebImageInternalSetImageGroupKey) boolValue];
+                    if (shouldUseGroup) {
+                        dispatch_group_notify(group, dispatch_get_main_queue(), callCompletedBlockClojure);
+                    } else {
+                        callCompletedBlockClojure();
+                    }
+                } else {
+                    callCompletedBlockClojure();
+                }
+            });
+        }];
+        [self sd_setImageLoadOperation:operation forKey:validOperationKey];
+    } else {
+        dispatch_main_async_safe(^{
+#if SD_UIKIT
+            [self sd_removeActivityIndicator];
+#endif
+            if (completedBlock) {
+                NSError *error = [NSError errorWithDomain:SDWebImageErrorDomain code:-1 userInfo:@{NSLocalizedDescriptionKey : @"Trying to load a nil url"}];
+                completedBlock(nil, error, SDImageCacheTypeNone, url);
+            }
+        });
+    }
+}
+
+- (void)sd_cancelCurrentImageLoad {
+    [self sd_cancelImageLoadOperationWithKey:NSStringFromClass([self class])];
+}
+
+- (void)sd_setImage:(UIImage *)image imageData:(NSData *)imageData basedOnClassOrViaCustomSetImageBlock:(SDSetImageBlock)setImageBlock {
+#if SD_UIKIT || SD_MAC
+    [self sd_setImage:image imageData:imageData basedOnClassOrViaCustomSetImageBlock:setImageBlock transition:nil cacheType:0 imageURL:nil];
+#else
+    // watchOS does not support view transition. Simplify the logic
+    if (setImageBlock) {
+        setImageBlock(image, imageData);
+    } else if ([self isKindOfClass:[UIImageView class]]) {
+        UIImageView *imageView = (UIImageView *)self;
+        [imageView setImage:image];
+    }
+#endif
+}
+
+#if SD_UIKIT || SD_MAC
+- (void)sd_setImage:(UIImage *)image imageData:(NSData *)imageData basedOnClassOrViaCustomSetImageBlock:(SDSetImageBlock)setImageBlock transition:(SDWebImageTransition *)transition cacheType:(SDImageCacheType)cacheType imageURL:(NSURL *)imageURL {
+    UIView *view = self;
+    SDSetImageBlock finalSetImageBlock;
+    if (setImageBlock) {
+        finalSetImageBlock = setImageBlock;
+    } else if ([view isKindOfClass:[UIImageView class]]) {
+        UIImageView *imageView = (UIImageView *)view;
+        finalSetImageBlock = ^(UIImage *setImage, NSData *setImageData) {
+            imageView.image = setImage;
+        };
+    }
+#if SD_UIKIT
+    else if ([view isKindOfClass:[UIButton class]]) {
+        UIButton *button = (UIButton *)view;
+        finalSetImageBlock = ^(UIImage *setImage, NSData *setImageData){
+            [button setImage:setImage forState:UIControlStateNormal];
+        };
+    }
+#endif
+    
+    if (transition) {
+#if SD_UIKIT
+        [UIView transitionWithView:view duration:0 options:0 animations:^{
+            // 0 duration to let UIKit render placeholder and prepares block
+            if (transition.prepares) {
+                transition.prepares(view, image, imageData, cacheType, imageURL);
+            }
+        } completion:^(BOOL finished) {
+            [UIView transitionWithView:view duration:transition.duration options:transition.animationOptions animations:^{
+                if (finalSetImageBlock && !transition.avoidAutoSetImage) {
+                    finalSetImageBlock(image, imageData);
+                }
+                if (transition.animations) {
+                    transition.animations(view, image);
+                }
+            } completion:transition.completion];
+        }];
+#elif SD_MAC
+        [NSAnimationContext runAnimationGroup:^(NSAnimationContext * _Nonnull prepareContext) {
+            // 0 duration to let AppKit render placeholder and prepares block
+            prepareContext.duration = 0;
+            if (transition.prepares) {
+                transition.prepares(view, image, imageData, cacheType, imageURL);
+            }
+        } completionHandler:^{
+            [NSAnimationContext runAnimationGroup:^(NSAnimationContext * _Nonnull context) {
+                context.duration = transition.duration;
+                context.timingFunction = transition.timingFunction;
+                context.allowsImplicitAnimation = (transition.animationOptions & SDWebImageAnimationOptionAllowsImplicitAnimation);
+                if (finalSetImageBlock && !transition.avoidAutoSetImage) {
+                    finalSetImageBlock(image, imageData);
+                }
+                if (transition.animations) {
+                    transition.animations(view, image);
+                }
+            } completionHandler:^{
+                if (transition.completion) {
+                    transition.completion(YES);
+                }
+            }];
+        }];
+#endif
+    } else {
+        if (finalSetImageBlock) {
+            finalSetImageBlock(image, imageData);
+        }
+    }
+}
+#endif
+
+- (void)sd_setNeedsLayout {
+#if SD_UIKIT
+    [self setNeedsLayout];
+#elif SD_MAC
+    [self setNeedsLayout:YES];
+#elif SD_WATCH
+    // Do nothing because WatchKit automatically layout the view after property change
+#endif
+}
+
+#if SD_UIKIT || SD_MAC
+
+#pragma mark - Image Transition
+- (SDWebImageTransition *)sd_imageTransition {
+    return objc_getAssociatedObject(self, @selector(sd_imageTransition));
+}
+
+- (void)setSd_imageTransition:(SDWebImageTransition *)sd_imageTransition {
+    objc_setAssociatedObject(self, @selector(sd_imageTransition), sd_imageTransition, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
+#if SD_UIKIT
+
+#pragma mark - Activity indicator
+- (UIActivityIndicatorView *)activityIndicator {
+    return (UIActivityIndicatorView *)objc_getAssociatedObject(self, &TAG_ACTIVITY_INDICATOR);
+}
+
+- (void)setActivityIndicator:(UIActivityIndicatorView *)activityIndicator {
+    objc_setAssociatedObject(self, &TAG_ACTIVITY_INDICATOR, activityIndicator, OBJC_ASSOCIATION_RETAIN);
+}
+
+- (void)sd_setShowActivityIndicatorView:(BOOL)show {
+    objc_setAssociatedObject(self, &TAG_ACTIVITY_SHOW, @(show), OBJC_ASSOCIATION_RETAIN);
+}
+
+- (BOOL)sd_showActivityIndicatorView {
+    return [objc_getAssociatedObject(self, &TAG_ACTIVITY_SHOW) boolValue];
+}
+
+- (void)sd_setIndicatorStyle:(UIActivityIndicatorViewStyle)style{
+    objc_setAssociatedObject(self, &TAG_ACTIVITY_STYLE, [NSNumber numberWithInt:style], OBJC_ASSOCIATION_RETAIN);
+}
+
+- (int)sd_getIndicatorStyle{
+    return [objc_getAssociatedObject(self, &TAG_ACTIVITY_STYLE) intValue];
+}
+
+- (void)sd_addActivityIndicator {
+    dispatch_main_async_safe(^{
+        if (!self.activityIndicator) {
+            self.activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:[self sd_getIndicatorStyle]];
+            self.activityIndicator.translatesAutoresizingMaskIntoConstraints = NO;
+        
+            [self addSubview:self.activityIndicator];
+            
+            [self addConstraint:[NSLayoutConstraint constraintWithItem:self.activityIndicator
+                                                             attribute:NSLayoutAttributeCenterX
+                                                             relatedBy:NSLayoutRelationEqual
+                                                                toItem:self
+                                                             attribute:NSLayoutAttributeCenterX
+                                                            multiplier:1.0
+                                                              constant:0.0]];
+            [self addConstraint:[NSLayoutConstraint constraintWithItem:self.activityIndicator
+                                                             attribute:NSLayoutAttributeCenterY
+                                                             relatedBy:NSLayoutRelationEqual
+                                                                toItem:self
+                                                             attribute:NSLayoutAttributeCenterY
+                                                            multiplier:1.0
+                                                              constant:0.0]];
+        }
+        [self.activityIndicator startAnimating];
+    });
+}
+
+- (void)sd_removeActivityIndicator {
+    dispatch_main_async_safe(^{
+        if (self.activityIndicator) {
+            [self.activityIndicator removeFromSuperview];
+            self.activityIndicator = nil;
+        }
+    });
+}
+
+#endif
+
+#endif
+
+@end

Pods/SDWebImage/SDWebImage/UIView+WebCacheOperation.h

@@ -0,0 +1,38 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageCompat.h"
+#import "SDWebImageOperation.h"
+
+// These methods are used to support canceling for UIView image loading, it's designed to be used internal but not external.
+// All the stored operations are weak, so it will be dalloced after image loading finished. If you need to store operations, use your own class to keep a strong reference for them.
+@interface UIView (WebCacheOperation)
+
+/**
+ *  Set the image load operation (storage in a UIView based weak map table)
+ *
+ *  @param operation the operation
+ *  @param key       key for storing the operation
+ */
+- (void)sd_setImageLoadOperation:(nullable id<SDWebImageOperation>)operation forKey:(nullable NSString *)key;
+
+/**
+ *  Cancel all operations for the current UIView and key
+ *
+ *  @param key key for identifying the operations
+ */
+- (void)sd_cancelImageLoadOperationWithKey:(nullable NSString *)key;
+
+/**
+ *  Just remove the operations corresponding to the current UIView and key without cancelling them
+ *
+ *  @param key key for identifying the operations
+ */
+- (void)sd_removeImageLoadOperationWithKey:(nullable NSString *)key;
+
+@end

Pods/SDWebImage/SDWebImage/UIView+WebCacheOperation.m

@@ -0,0 +1,73 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "UIView+WebCacheOperation.h"
+#import "objc/runtime.h"
+
+static char loadOperationKey;
+
+// key is copy, value is weak because operation instance is retained by SDWebImageManager's runningOperations property
+// we should use lock to keep thread-safe because these method may not be acessed from main queue
+typedef NSMapTable<NSString *, id<SDWebImageOperation>> SDOperationsDictionary;
+
+@implementation UIView (WebCacheOperation)
+
+- (SDOperationsDictionary *)sd_operationDictionary {
+    @synchronized(self) {
+        SDOperationsDictionary *operations = objc_getAssociatedObject(self, &loadOperationKey);
+        if (operations) {
+            return operations;
+        }
+        operations = [[NSMapTable alloc] initWithKeyOptions:NSPointerFunctionsStrongMemory valueOptions:NSPointerFunctionsWeakMemory capacity:0];
+        objc_setAssociatedObject(self, &loadOperationKey, operations, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+        return operations;
+    }
+}
+
+- (void)sd_setImageLoadOperation:(nullable id<SDWebImageOperation>)operation forKey:(nullable NSString *)key {
+    if (key) {
+        [self sd_cancelImageLoadOperationWithKey:key];
+        if (operation) {
+            SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
+            @synchronized (self) {
+                [operationDictionary setObject:operation forKey:key];
+            }
+        }
+    }
+}
+
+- (void)sd_cancelImageLoadOperationWithKey:(nullable NSString *)key {
+    if (key) {
+        // Cancel in progress downloader from queue
+        SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
+        id<SDWebImageOperation> operation;
+        
+        @synchronized (self) {
+            operation = [operationDictionary objectForKey:key];
+        }
+        if (operation) {
+            if ([operation conformsToProtocol:@protocol(SDWebImageOperation)]) {
+                [operation cancel];
+            }
+            @synchronized (self) {
+                [operationDictionary removeObjectForKey:key];
+            }
+        }
+    }
+}
+
+- (void)sd_removeImageLoadOperationWithKey:(nullable NSString *)key {
+    if (key) {
+        SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
+        @synchronized (self) {
+            [operationDictionary removeObjectForKey:key];
+        }
+    }
+}
+
+@end