Initial commit
This commit is contained in:
ifish
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/*
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MIT License (MIT)
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Copyright (c) 2015 Clement CN Tsang
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#import "CTAssetsPickerDefines.h"
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#import "CTAssetsPickerController.h"
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#import "CTAssetsPickerController+Internal.h"
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#import "CTAssetsGridViewController.h"
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#import "CTAssetsGridView.h"
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#import "CTAssetsGridViewLayout.h"
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#import "CTAssetsGridViewCell.h"
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#import "CTAssetsGridViewFooter.h"
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#import "CTAssetsPickerNoAssetsView.h"
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#import "CTAssetsPageViewController.h"
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#import "CTAssetsPageViewController+Internal.h"
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#import "CTAssetsViewControllerTransition.h"
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#import "UICollectionView+CTAssetsPickerController.h"
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#import "NSIndexSet+CTAssetsPickerController.h"
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#import "NSBundle+CTAssetsPickerController.h"
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#import "PHImageManager+CTAssetsPickerController.h"
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NSString * const CTAssetsGridViewCellIdentifier = @"CTAssetsGridViewCellIdentifier";
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NSString * const CTAssetsGridViewFooterIdentifier = @"CTAssetsGridViewFooterIdentifier";
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@interface CTAssetsGridViewController ()
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<PHPhotoLibraryChangeObserver>
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@property (nonatomic, weak) CTAssetsPickerController *picker;
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@property (nonatomic, strong) PHFetchResult *fetchResult;
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@property (nonatomic, strong) PHCachingImageManager *imageManager;
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@property (nonatomic, assign) CGRect previousPreheatRect;
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@property (nonatomic, assign) CGRect previousBounds;
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@property (nonatomic, strong) CTAssetsGridViewFooter *footer;
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@property (nonatomic, strong) CTAssetsPickerNoAssetsView *noAssetsView;
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@property (nonatomic, assign) BOOL didLayoutSubviews;
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@end
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@implementation CTAssetsGridViewController
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- (instancetype)init
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{
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CTAssetsGridViewLayout *layout = [CTAssetsGridViewLayout new];
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if (self = [super initWithCollectionViewLayout:layout])
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{
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_imageManager = [PHCachingImageManager new];
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self.extendedLayoutIncludesOpaqueBars = YES;
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self.collectionView.allowsMultipleSelection = YES;
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[self.collectionView registerClass:CTAssetsGridViewCell.class
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forCellWithReuseIdentifier:CTAssetsGridViewCellIdentifier];
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[self.collectionView registerClass:CTAssetsGridViewFooter.class
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forSupplementaryViewOfKind:UICollectionElementKindSectionFooter
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withReuseIdentifier:CTAssetsGridViewFooterIdentifier];
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[self addNotificationObserver];
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}
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return self;
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}
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- (void)viewDidLoad
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{
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[super viewDidLoad];
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[self setupViews];
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[self registerChangeObserver];
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[self addGestureRecognizer];
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[self addNotificationObserver];
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[self resetCachedAssetImages];
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}
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- (void)viewWillAppear:(BOOL)animated
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{
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[super viewWillAppear:animated];
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[self setupButtons];
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[self setupAssets];
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[self updateTitle:self.picker.selectedAssets];
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[self updateButton:self.picker.selectedAssets];
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}
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- (void)viewDidAppear:(BOOL)animated
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{
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[super viewDidAppear:animated];
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[self updateCachedAssetImages];
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}
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- (void)viewWillLayoutSubviews
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{
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[super viewWillLayoutSubviews];
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if (!CGRectEqualToRect(self.view.bounds, self.previousBounds))
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{
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[self updateCollectionViewLayout];
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self.previousBounds = self.view.bounds;
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}
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}
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- (void)viewDidLayoutSubviews
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{
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[super viewDidLayoutSubviews];
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if (!self.didLayoutSubviews && self.fetchResult.count > 0)
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{
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[self scrollToBottomIfNeeded];
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self.didLayoutSubviews = YES;
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}
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}
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- (void)dealloc
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{
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[self unregisterChangeObserver];
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[self removeNotificationObserver];
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}
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#pragma mark - Accessors
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- (CTAssetsPickerController *)picker
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{
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return (CTAssetsPickerController *)self.splitViewController.parentViewController;
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}
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- (PHAsset *)assetAtIndexPath:(NSIndexPath *)indexPath
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{
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return (self.fetchResult.count > 0) ? self.fetchResult[indexPath.item] : nil;
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}
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#pragma mark - Setup
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- (void)setupViews
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{
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self.collectionView.backgroundColor = [UIColor colorWithWhite:0 alpha:0];
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CTAssetsGridView *gridView = [CTAssetsGridView new];
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[self.view insertSubview:gridView atIndex:0];
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[self.view setNeedsUpdateConstraints];
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}
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- (void)setupButtons
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{
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if (self.navigationItem.rightBarButtonItem == nil)
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{
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NSString *title = (self.picker.doneButtonTitle) ?
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self.picker.doneButtonTitle : CTAssetsPickerLocalizedString(@"Done", nil);
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self.navigationItem.rightBarButtonItem =
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[[UIBarButtonItem alloc] initWithTitle:title
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style:UIBarButtonItemStyleDone
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target:self.picker
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action:@selector(finishPickingAssets:)];
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}
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}
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- (void)setupAssets
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{
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PHFetchResult *fetchResult =
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[PHAsset fetchAssetsInAssetCollection:self.assetCollection
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options:self.picker.assetsFetchOptions];
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self.fetchResult = fetchResult;
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[self reloadData];
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}
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#pragma mark - Collection view layout
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- (void)updateCollectionViewLayout
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{
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UITraitCollection *trait = self.traitCollection;
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CGSize contentSize = self.view.bounds.size;
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UICollectionViewLayout *layout;
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NSArray *attributes = [self.collectionView.collectionViewLayout layoutAttributesForElementsInRect:self.collectionView.bounds];
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UICollectionViewLayoutAttributes *attr = (UICollectionViewLayoutAttributes*)attributes.firstObject;
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// new content size should be at least of first item size, else ignoring
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if (contentSize.width < attr.size.width || contentSize.height < attr.size.height) {
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return;
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}
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if ([self.picker.delegate respondsToSelector:@selector(assetsPickerController:collectionViewLayoutForContentSize:traitCollection:)]) {
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layout = [self.picker.delegate assetsPickerController:self.picker collectionViewLayoutForContentSize:contentSize traitCollection:trait];
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} else {
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layout = [[CTAssetsGridViewLayout alloc] initWithContentSize:contentSize traitCollection:trait];
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}
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__weak CTAssetsGridViewController *weakSelf = self;
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[self.collectionView setCollectionViewLayout:layout animated:NO completion:^(BOOL finished){
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[weakSelf.collectionView reloadItemsAtIndexPaths:[weakSelf.collectionView indexPathsForVisibleItems]];
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}];
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}
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#pragma mark - Scroll to bottom
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- (void)scrollToBottomIfNeeded
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{
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BOOL shouldScrollToBottom;
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if ([self.picker.delegate respondsToSelector:@selector(assetsPickerController:shouldScrollToBottomForAssetCollection:)])
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shouldScrollToBottom = [self.picker.delegate assetsPickerController:self.picker shouldScrollToBottomForAssetCollection:self.assetCollection];
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else
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shouldScrollToBottom = YES;
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if (shouldScrollToBottom)
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{
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NSIndexPath *indexPath = [NSIndexPath indexPathForItem:self.fetchResult.count-1 inSection:0];
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[self.collectionView scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionTop animated:NO];
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}
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}
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#pragma mark - Notifications
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- (void)addNotificationObserver
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{
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NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
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[center addObserver:self
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selector:@selector(assetsPickerSelectedAssetsDidChange:)
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name:CTAssetsPickerSelectedAssetsDidChangeNotification
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object:nil];
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[center addObserver:self
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selector:@selector(assetsPickerDidSelectAsset:)
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name:CTAssetsPickerDidSelectAssetNotification
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object:nil];
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[center addObserver:self
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selector:@selector(assetsPickerDidDeselectAsset:)
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name:CTAssetsPickerDidDeselectAssetNotification
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object:nil];
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}
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- (void)removeNotificationObserver
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{
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NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
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[center removeObserver:self name:CTAssetsPickerSelectedAssetsDidChangeNotification object:nil];
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[center removeObserver:self name:CTAssetsPickerDidSelectAssetNotification object:nil];
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[center removeObserver:self name:CTAssetsPickerDidDeselectAssetNotification object:nil];
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}
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#pragma mark - Photo library change observer
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- (void)registerChangeObserver
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{
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[[PHPhotoLibrary sharedPhotoLibrary] registerChangeObserver:self];
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}
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- (void)unregisterChangeObserver
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{
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[[PHPhotoLibrary sharedPhotoLibrary] unregisterChangeObserver:self];
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}
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#pragma mark - Photo library changed
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- (void)photoLibraryDidChange:(PHChange *)changeInstance
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{
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// Call might come on any background queue. Re-dispatch to the main queue to handle it.
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dispatch_async(dispatch_get_main_queue(), ^{
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PHFetchResultChangeDetails *changeDetails = [changeInstance changeDetailsForFetchResult:self.fetchResult];
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if (changeDetails)
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{
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self.fetchResult = changeDetails.fetchResultAfterChanges;
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UICollectionView *collectionView = self.collectionView;
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if (!changeDetails.hasIncrementalChanges || changeDetails.hasMoves)
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{
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[collectionView reloadData];
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[self resetCachedAssetImages];
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}
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else
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{
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NSArray *removedPaths;
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NSArray *insertedPaths;
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NSArray *changedPaths;
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NSIndexSet *removedIndexes = changeDetails.removedIndexes;
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removedPaths = [removedIndexes ctassetsPickerIndexPathsFromIndexesWithSection:0];
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NSIndexSet *insertedIndexes = changeDetails.insertedIndexes;
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insertedPaths = [insertedIndexes ctassetsPickerIndexPathsFromIndexesWithSection:0];
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NSIndexSet *changedIndexes = changeDetails.changedIndexes;
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changedPaths = [changedIndexes ctassetsPickerIndexPathsFromIndexesWithSection:0];
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BOOL shouldReload = NO;
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if (changedPaths != nil && removedPaths != nil)
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{
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for (NSIndexPath *changedPath in changedPaths)
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{
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if ([removedPaths containsObject:changedPath])
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{
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shouldReload = YES;
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break;
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}
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}
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}
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if (removedPaths.lastObject && ((NSIndexPath *)removedPaths.lastObject).item >= self.fetchResult.count)
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{
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shouldReload = YES;
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}
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if (shouldReload)
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{
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[collectionView reloadData];
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}
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else
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{
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// if we have incremental diffs, tell the collection view to animate insertions and deletions
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[collectionView performBatchUpdates:^{
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if (removedPaths.count)
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{
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[collectionView deleteItemsAtIndexPaths:[removedIndexes ctassetsPickerIndexPathsFromIndexesWithSection:0]];
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}
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if (insertedPaths.count)
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{
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[collectionView insertItemsAtIndexPaths:[insertedIndexes ctassetsPickerIndexPathsFromIndexesWithSection:0]];
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}
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if (changedPaths.count)
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{
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[collectionView reloadItemsAtIndexPaths:[changedIndexes ctassetsPickerIndexPathsFromIndexesWithSection:0] ];
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}
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} completion:^(BOOL finished){
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if (finished)
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[self resetCachedAssetImages];
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}];
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}
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}
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[self.footer bind:self.fetchResult];
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if (self.fetchResult.count == 0)
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[self showNoAssets];
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else
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[self hideNoAssets];
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}
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if ([self.delegate respondsToSelector:@selector(assetsGridViewController:photoLibraryDidChangeForAssetCollection:)])
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[self.delegate assetsGridViewController:self photoLibraryDidChangeForAssetCollection:self.assetCollection];
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});
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}
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#pragma mark - Selected assets changed
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- (void)assetsPickerSelectedAssetsDidChange:(NSNotification *)notification
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{
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NSArray *selectedAssets = (NSArray *)notification.object;
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[self updateTitle:selectedAssets];
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[self updateButton:selectedAssets];
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}
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- (void)updateTitle:(NSArray *)selectedAssets
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{
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if (selectedAssets.count > 0)
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self.title = self.picker.selectedAssetsString;
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else
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self.title = self.assetCollection.localizedTitle;
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}
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- (void)updateButton:(NSArray *)selectedAssets
|
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{
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if (self.picker.alwaysEnableDoneButton)
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self.navigationItem.rightBarButtonItem.enabled = YES;
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else
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self.navigationItem.rightBarButtonItem.enabled = (self.picker.selectedAssets.count > 0);
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}
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||||
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#pragma mark - Did de/select asset notifications
|
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- (void)assetsPickerDidSelectAsset:(NSNotification *)notification
|
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{
|
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PHAsset *asset = (PHAsset *)notification.object;
|
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NSIndexPath *indexPath = [NSIndexPath indexPathForItem:[self.fetchResult indexOfObject:asset] inSection:0];
|
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[self.collectionView selectItemAtIndexPath:indexPath animated:NO scrollPosition:UICollectionViewScrollPositionNone];
|
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[self updateSelectionOrderLabels];
|
||||
}
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||||
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||||
- (void)assetsPickerDidDeselectAsset:(NSNotification *)notification
|
||||
{
|
||||
PHAsset *asset = (PHAsset *)notification.object;
|
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NSIndexPath *indexPath = [NSIndexPath indexPathForItem:[self.fetchResult indexOfObject:asset] inSection:0];
|
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[self.collectionView deselectItemAtIndexPath:indexPath animated:NO];
|
||||
|
||||
[self updateSelectionOrderLabels];
|
||||
}
|
||||
|
||||
|
||||
#pragma mark - Update Selection Order Labels
|
||||
|
||||
- (void)updateSelectionOrderLabels
|
||||
{
|
||||
for (NSIndexPath *indexPath in [self.collectionView indexPathsForSelectedItems])
|
||||
{
|
||||
PHAsset *asset = [self assetAtIndexPath:indexPath];
|
||||
CTAssetsGridViewCell *cell = (CTAssetsGridViewCell *)[self.collectionView cellForItemAtIndexPath:indexPath];
|
||||
cell.selectionIndex = [self.picker.selectedAssets indexOfObject:asset];
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
#pragma mark - Gesture recognizer
|
||||
|
||||
- (void)addGestureRecognizer
|
||||
{
|
||||
UILongPressGestureRecognizer *longPress =
|
||||
[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(pushPageViewController:)];
|
||||
|
||||
[self.collectionView addGestureRecognizer:longPress];
|
||||
}
|
||||
|
||||
|
||||
#pragma mark - Push assets page view controller
|
||||
|
||||
- (void)pushPageViewController:(UILongPressGestureRecognizer *)longPress
|
||||
{
|
||||
if (longPress.state == UIGestureRecognizerStateBegan)
|
||||
{
|
||||
CGPoint point = [longPress locationInView:self.collectionView];
|
||||
NSIndexPath *indexPath = [self.collectionView indexPathForItemAtPoint:point];
|
||||
|
||||
CTAssetsPageViewController *vc = [[CTAssetsPageViewController alloc] initWithFetchResult:self.fetchResult];
|
||||
vc.allowsSelection = YES;
|
||||
vc.pageIndex = indexPath.item;
|
||||
|
||||
[self.navigationController pushViewController:vc animated:YES];
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
#pragma mark - Reload data
|
||||
|
||||
- (void)reloadData
|
||||
{
|
||||
if (self.fetchResult.count > 0)
|
||||
{
|
||||
[self hideNoAssets];
|
||||
[self.collectionView reloadData];
|
||||
}
|
||||
else
|
||||
{
|
||||
[self showNoAssets];
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
#pragma mark - Asset images caching
|
||||
|
||||
- (void)resetCachedAssetImages
|
||||
{
|
||||
[self.imageManager stopCachingImagesForAllAssets];
|
||||
self.previousPreheatRect = CGRectZero;
|
||||
}
|
||||
|
||||
- (void)updateCachedAssetImages
|
||||
{
|
||||
BOOL isViewVisible = [self isViewLoaded] && self.view.window != nil;
|
||||
|
||||
if (!isViewVisible)
|
||||
return;
|
||||
|
||||
// The preheat window is twice the height of the visible rect
|
||||
CGRect preheatRect = self.collectionView.bounds;
|
||||
preheatRect = CGRectInset(preheatRect, 0.0f, -0.5f * CGRectGetHeight(preheatRect));
|
||||
|
||||
// If scrolled by a "reasonable" amount...
|
||||
CGFloat delta = ABS(CGRectGetMidY(preheatRect) - CGRectGetMidY(self.previousPreheatRect));
|
||||
|
||||
if (delta > CGRectGetHeight(self.collectionView.bounds) / 3.0f)
|
||||
{
|
||||
// Compute the assets to start caching and to stop caching.
|
||||
NSMutableArray *addedIndexPaths = [NSMutableArray array];
|
||||
NSMutableArray *removedIndexPaths = [NSMutableArray array];
|
||||
|
||||
[self computeDifferenceBetweenRect:self.previousPreheatRect
|
||||
andRect:preheatRect
|
||||
removedHandler:^(CGRect removedRect) {
|
||||
NSArray *indexPaths = [self.collectionView ctassetsPickerIndexPathsForElementsInRect:removedRect];
|
||||
[removedIndexPaths addObjectsFromArray:indexPaths];
|
||||
} addedHandler:^(CGRect addedRect) {
|
||||
NSArray *indexPaths = [self.collectionView ctassetsPickerIndexPathsForElementsInRect:addedRect];
|
||||
[addedIndexPaths addObjectsFromArray:indexPaths];
|
||||
}];
|
||||
|
||||
[self startCachingThumbnailsForIndexPaths:addedIndexPaths];
|
||||
[self stopCachingThumbnailsForIndexPaths:removedIndexPaths];
|
||||
|
||||
self.previousPreheatRect = preheatRect;
|
||||
}
|
||||
}
|
||||
|
||||
- (void)startCachingThumbnailsForIndexPaths:(NSArray *)indexPaths
|
||||
{
|
||||
for (NSIndexPath *indexPath in indexPaths)
|
||||
{
|
||||
PHAsset *asset = [self assetAtIndexPath:indexPath];
|
||||
|
||||
if (!asset) break;
|
||||
|
||||
UICollectionViewLayoutAttributes *attributes =
|
||||
[self.collectionView.collectionViewLayout layoutAttributesForItemAtIndexPath:indexPath];
|
||||
|
||||
CGSize targetSize = [self.picker imageSizeForContainerSize:attributes.size];
|
||||
|
||||
[self.imageManager startCachingImagesForAssets:@[asset]
|
||||
targetSize:targetSize
|
||||
contentMode:PHImageContentModeAspectFill
|
||||
options:self.picker.thumbnailRequestOptions];
|
||||
}
|
||||
}
|
||||
|
||||
- (void)stopCachingThumbnailsForIndexPaths:(NSArray *)indexPaths
|
||||
{
|
||||
for (NSIndexPath *indexPath in indexPaths)
|
||||
{
|
||||
PHAsset *asset = [self assetAtIndexPath:indexPath];
|
||||
|
||||
if (!asset) break;
|
||||
|
||||
UICollectionViewLayoutAttributes *attributes =
|
||||
[self.collectionView.collectionViewLayout layoutAttributesForItemAtIndexPath:indexPath];
|
||||
|
||||
CGSize targetSize = [self.picker imageSizeForContainerSize:attributes.size];
|
||||
|
||||
[self.imageManager stopCachingImagesForAssets:@[asset]
|
||||
targetSize:targetSize
|
||||
contentMode:PHImageContentModeAspectFill
|
||||
options:self.picker.thumbnailRequestOptions];
|
||||
}
|
||||
}
|
||||
|
||||
- (void)computeDifferenceBetweenRect:(CGRect)oldRect andRect:(CGRect)newRect removedHandler:(void (^)(CGRect removedRect))removedHandler addedHandler:(void (^)(CGRect addedRect))addedHandler
|
||||
{
|
||||
if (CGRectIntersectsRect(newRect, oldRect)) {
|
||||
CGFloat oldMaxY = CGRectGetMaxY(oldRect);
|
||||
CGFloat oldMinY = CGRectGetMinY(oldRect);
|
||||
CGFloat newMaxY = CGRectGetMaxY(newRect);
|
||||
CGFloat newMinY = CGRectGetMinY(newRect);
|
||||
if (newMaxY > oldMaxY) {
|
||||
CGRect rectToAdd = CGRectMake(newRect.origin.x, oldMaxY, newRect.size.width, (newMaxY - oldMaxY));
|
||||
addedHandler(rectToAdd);
|
||||
}
|
||||
if (oldMinY > newMinY) {
|
||||
CGRect rectToAdd = CGRectMake(newRect.origin.x, newMinY, newRect.size.width, (oldMinY - newMinY));
|
||||
addedHandler(rectToAdd);
|
||||
}
|
||||
if (newMaxY < oldMaxY) {
|
||||
CGRect rectToRemove = CGRectMake(newRect.origin.x, newMaxY, newRect.size.width, (oldMaxY - newMaxY));
|
||||
removedHandler(rectToRemove);
|
||||
}
|
||||
if (oldMinY < newMinY) {
|
||||
CGRect rectToRemove = CGRectMake(newRect.origin.x, oldMinY, newRect.size.width, (newMinY - oldMinY));
|
||||
removedHandler(rectToRemove);
|
||||
}
|
||||
} else {
|
||||
addedHandler(newRect);
|
||||
removedHandler(oldRect);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
#pragma mark - Scroll view delegate
|
||||
|
||||
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
|
||||
{
|
||||
[self updateCachedAssetImages];
|
||||
}
|
||||
|
||||
|
||||
#pragma mark - No assets
|
||||
|
||||
- (void)showNoAssets
|
||||
{
|
||||
CTAssetsPickerNoAssetsView *view = [CTAssetsPickerNoAssetsView new];
|
||||
[self.view addSubview:view];
|
||||
[view setNeedsUpdateConstraints];
|
||||
[view updateConstraintsIfNeeded];
|
||||
|
||||
self.noAssetsView = view;
|
||||
}
|
||||
|
||||
- (void)hideNoAssets
|
||||
{
|
||||
if (self.noAssetsView)
|
||||
{
|
||||
[self.noAssetsView removeFromSuperview];
|
||||
self.noAssetsView = nil;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
#pragma mark - Collection view data source
|
||||
|
||||
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
|
||||
{
|
||||
return self.fetchResult.count;
|
||||
}
|
||||
|
||||
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
|
||||
{
|
||||
CTAssetsGridViewCell *cell =
|
||||
[collectionView dequeueReusableCellWithReuseIdentifier:CTAssetsGridViewCellIdentifier
|
||||
forIndexPath:indexPath];
|
||||
|
||||
PHAsset *asset = [self assetAtIndexPath:indexPath];
|
||||
|
||||
if ([self.picker.delegate respondsToSelector:@selector(assetsPickerController:shouldEnableAsset:)])
|
||||
cell.enabled = [self.picker.delegate assetsPickerController:self.picker shouldEnableAsset:asset];
|
||||
else
|
||||
cell.enabled = YES;
|
||||
|
||||
cell.showsSelectionIndex = self.picker.showsSelectionIndex;
|
||||
|
||||
// XXX
|
||||
// Setting `selected` property blocks further deselection.
|
||||
// Have to call selectItemAtIndexPath too. ( ref: http://stackoverflow.com/a/17812116/1648333 )
|
||||
if ([self.picker.selectedAssets containsObject:asset])
|
||||
{
|
||||
cell.selected = YES;
|
||||
cell.selectionIndex = [self.picker.selectedAssets indexOfObject:asset];
|
||||
[collectionView selectItemAtIndexPath:indexPath animated:NO scrollPosition:UICollectionViewScrollPositionNone];
|
||||
}
|
||||
|
||||
[cell bind:asset];
|
||||
|
||||
UICollectionViewLayoutAttributes *attributes =
|
||||
[collectionView.collectionViewLayout layoutAttributesForItemAtIndexPath:indexPath];
|
||||
|
||||
CGSize targetSize = [self.picker imageSizeForContainerSize:attributes.size];
|
||||
|
||||
[self requestThumbnailForCell:cell targetSize:targetSize asset:asset];
|
||||
|
||||
return cell;
|
||||
}
|
||||
|
||||
- (void)requestThumbnailForCell:(CTAssetsGridViewCell *)cell targetSize:(CGSize)targetSize asset:(PHAsset *)asset
|
||||
{
|
||||
NSInteger tag = cell.tag + 1;
|
||||
cell.tag = tag;
|
||||
|
||||
[self.imageManager ctassetsPickerRequestImageForAsset:asset
|
||||
targetSize:targetSize
|
||||
contentMode:PHImageContentModeAspectFill
|
||||
options:self.picker.thumbnailRequestOptions
|
||||
resultHandler:^(UIImage *image, NSDictionary *info){
|
||||
// Only update the image if the cell tag hasn't changed. Otherwise, the cell has been re-used.
|
||||
if (cell.tag == tag)
|
||||
[(CTAssetThumbnailView *)cell.backgroundView bind:image asset:asset];
|
||||
}];
|
||||
}
|
||||
|
||||
- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
|
||||
{
|
||||
CTAssetsGridViewFooter *footer =
|
||||
[collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionFooter
|
||||
withReuseIdentifier:CTAssetsGridViewFooterIdentifier
|
||||
forIndexPath:indexPath];
|
||||
|
||||
[footer bind:self.fetchResult];
|
||||
|
||||
self.footer = footer;
|
||||
|
||||
return footer;
|
||||
}
|
||||
|
||||
|
||||
#pragma mark - Collection view delegate
|
||||
|
||||
- (BOOL)collectionView:(UICollectionView *)collectionView shouldSelectItemAtIndexPath:(NSIndexPath *)indexPath
|
||||
{
|
||||
PHAsset *asset = [self assetAtIndexPath:indexPath];
|
||||
|
||||
CTAssetsGridViewCell *cell = (CTAssetsGridViewCell *)[collectionView cellForItemAtIndexPath:indexPath];
|
||||
|
||||
if (!cell.isEnabled)
|
||||
return NO;
|
||||
else if ([self.picker.delegate respondsToSelector:@selector(assetsPickerController:shouldSelectAsset:)])
|
||||
return [self.picker.delegate assetsPickerController:self.picker shouldSelectAsset:asset];
|
||||
else
|
||||
return YES;
|
||||
}
|
||||
|
||||
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
|
||||
{
|
||||
PHAsset *asset = [self assetAtIndexPath:indexPath];
|
||||
|
||||
[self.picker selectAsset:asset];
|
||||
|
||||
if ([self.picker.delegate respondsToSelector:@selector(assetsPickerController:didSelectAsset:)])
|
||||
[self.picker.delegate assetsPickerController:self.picker didSelectAsset:asset];
|
||||
}
|
||||
|
||||
- (BOOL)collectionView:(UICollectionView *)collectionView shouldDeselectItemAtIndexPath:(NSIndexPath *)indexPath
|
||||
{
|
||||
PHAsset *asset = [self assetAtIndexPath:indexPath];
|
||||
|
||||
if ([self.picker.delegate respondsToSelector:@selector(assetsPickerController:shouldDeselectAsset:)])
|
||||
return [self.picker.delegate assetsPickerController:self.picker shouldDeselectAsset:asset];
|
||||
else
|
||||
return YES;
|
||||
}
|
||||
|
||||
- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath
|
||||
{
|
||||
PHAsset *asset = [self assetAtIndexPath:indexPath];
|
||||
|
||||
[self.picker deselectAsset:asset];
|
||||
|
||||
if ([self.picker.delegate respondsToSelector:@selector(assetsPickerController:didDeselectAsset:)])
|
||||
[self.picker.delegate assetsPickerController:self.picker didDeselectAsset:asset];
|
||||
}
|
||||
|
||||
- (BOOL)collectionView:(UICollectionView *)collectionView shouldHighlightItemAtIndexPath:(NSIndexPath *)indexPath
|
||||
{
|
||||
PHAsset *asset = [self assetAtIndexPath:indexPath];
|
||||
|
||||
if ([self.picker.delegate respondsToSelector:@selector(assetsPickerController:shouldHighlightAsset:)])
|
||||
return [self.picker.delegate assetsPickerController:self.picker shouldHighlightAsset:asset];
|
||||
else
|
||||
return YES;
|
||||
}
|
||||
|
||||
- (void)collectionView:(UICollectionView *)collectionView didHighlightItemAtIndexPath:(NSIndexPath *)indexPath
|
||||
{
|
||||
PHAsset *asset = [self assetAtIndexPath:indexPath];
|
||||
|
||||
if ([self.picker.delegate respondsToSelector:@selector(assetsPickerController:didHighlightAsset:)])
|
||||
[self.picker.delegate assetsPickerController:self.picker didHighlightAsset:asset];
|
||||
}
|
||||
|
||||
- (void)collectionView:(UICollectionView *)collectionView didUnhighlightItemAtIndexPath:(NSIndexPath *)indexPath
|
||||
{
|
||||
PHAsset *asset = [self assetAtIndexPath:indexPath];
|
||||
|
||||
if ([self.picker.delegate respondsToSelector:@selector(assetsPickerController:didUnhighlightAsset:)])
|
||||
[self.picker.delegate assetsPickerController:self.picker didUnhighlightAsset:asset];
|
||||
}
|
||||
|
||||
@end
|
||||
Reference in New Issue
Block a user