111 lines
3.4 KiB
Objective-C
111 lines
3.4 KiB
Objective-C
//
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// UMImagePickerThumbnailView.m
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// UMCommunity
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//
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// Created by luyiyuan on 14/9/9.
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// Copyright (c) 2014年 Umeng. All rights reserved.
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//
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#import "UMImagePickerThumbnailView.h"
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@interface UMImagePickerThumbnailView()
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@property (nonatomic, copy) NSArray *thumbnailImages;
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@property (nonatomic, strong) UIImage *blankImage;
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@end
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@implementation UMImagePickerThumbnailView
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- (instancetype)initWithFrame:(CGRect)frame
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{
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self = [super initWithFrame:frame];
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if (self) {
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self.backgroundColor = [UIColor clearColor];
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}
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return self;
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}
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- (CGSize)sizeThatFits:(CGSize)size
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{
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return CGSizeMake(70.0, 74.0);
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}
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- (void)drawRect:(CGRect)rect
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{
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[super drawRect:rect];
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CGContextRef context = UIGraphicsGetCurrentContext();
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CGContextSetRGBFillColor(context, 1.0, 1.0, 1.0, 1.0);
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if (self.thumbnailImages.count == 3) {
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UIImage *thumbnailImage = self.thumbnailImages[2];
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CGRect thumbnailImageRect = CGRectMake(4.0, 0, 62.0, 62.0);
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CGContextFillRect(context, thumbnailImageRect);
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[thumbnailImage drawInRect:CGRectInset(thumbnailImageRect, 0.5, 0.5)];
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}
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if (self.thumbnailImages.count >= 2) {
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UIImage *thumbnailImage = self.thumbnailImages[1];
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CGRect thumbnailImageRect = CGRectMake(2.0, 2.0, 66.0, 66.0);
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CGContextFillRect(context, thumbnailImageRect);
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[thumbnailImage drawInRect:CGRectInset(thumbnailImageRect, 0.5, 0.5)];
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}
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if (self.thumbnailImages.count >= 1) {
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UIImage *thumbnailImage = self.thumbnailImages[0];
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CGRect thumbnailImageRect = CGRectMake(0, 4.0, 70.0, 70.0);
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CGContextFillRect(context, thumbnailImageRect);
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[thumbnailImage drawInRect:CGRectInset(thumbnailImageRect, 0.5, 0.5)];
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}
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}
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#pragma mark - Accessors
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- (void)setAssetsGroup:(ALAssetsGroup *)assetsGroup
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{
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_assetsGroup = assetsGroup;
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// Extract three thumbnail images
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NSIndexSet *indexes = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, MIN(3, assetsGroup.numberOfAssets))];
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NSMutableArray *thumbnailImages = [NSMutableArray array];
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[assetsGroup enumerateAssetsAtIndexes:indexes
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options:0
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usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
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if (result) {
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CGImageRef thumbnailImageRef = [result thumbnail];
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if (thumbnailImageRef) {
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[thumbnailImages addObject:[UIImage imageWithCGImage:thumbnailImageRef]];
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} else {
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[thumbnailImages addObject:[self blankImage]];
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}
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}
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}];
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self.thumbnailImages = [thumbnailImages copy];
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[self setNeedsDisplay];
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}
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- (UIImage *)blankImage
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{
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if (_blankImage == nil) {
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CGSize size = CGSizeMake(100.0, 100.0);
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UIGraphicsBeginImageContextWithOptions(size, NO, 0.0);
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[[UIColor colorWithWhite:(240.0 / 255.0) alpha:1.0] setFill];
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UIRectFill(CGRectMake(0, 0, size.width, size.height));
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_blankImage = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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}
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return _blankImage;
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}
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@end
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