大佬教程收集整理的这篇文章主要介绍了ios – 重用UICollectionView中的单元格时,会短暂显示重用的UICollectionViewCell的旧内容,大佬教程大佬觉得挺不错的,现在分享给大家,也给大家做个参考。
以下是自定义UICollectionViewController的实现:
#import "MyCollectionViewViewController.h" #import "MyCollectionViewCell.h" @interface MyCollectionViewViewController () @property (strong,nonatomiC) NSArray *data; @end @implementation MyCollectionViewViewController @synthesize data = _data; - (void)viewDidLoad { [super viewDidLoad]; self.data = @[ @"http://s3-ec.buzzfed.com/static/enhanced/webdr01/2013/1/18/12/enhanced-buzz-wide-851-1358529670-4.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr03/2013/1/18/11/enhanced-buzz-wide-26311-1358526816-5.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr03/2013/1/18/11/enhanced-buzz-wide-26311-1358527190-11.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr02/2013/1/18/11/enhanced-buzz-wide-7517-1358526694-11.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr03/2013/1/18/11/enhanced-buzz-wide-1965-1358527802-7.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr03/2013/1/18/11/enhanced-buzz-wide-2165-1358527708-14.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr03/2013/1/18/11/enhanced-buzz-wide-1965-1358527894-12.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr02/2013/1/18/12/enhanced-buzz-wide-15957-1358529198-18.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr02/2013/1/18/12/enhanced-buzz-wide-16520-1358528981-9.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr02/2013/1/18/12/enhanced-buzz-wide-16517-1358529292-5.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr01/2013/1/18/12/enhanced-buzz-wide-20349-1358529323-20.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr01/2013/1/18/12/enhanced-buzz-wide-32444-1358529959-9.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr01/2013/1/18/12/enhanced-buzz-wide-32343-1358530043-7.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr02/2013/1/18/12/enhanced-buzz-wide-23646-1358530321-2.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr01/2013/1/18/12/enhanced-buzz-wide-28223-1358530801-15.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr01/2013/1/18/12/enhanced-buzz-wide-32273-1358530695-16.jpg",@"http://s3-ec.buzzfed.com/static/enhanced/webdr01/2013/1/18/12/enhanced-buzz-wide-31288-1358531103-16.jpg" ]; [self.collectionView registerNib:[UINib nibWithNibName:@"MyCollectionViewCell" bundle:[NSBundle mainBundle]] forCellWithReusEIDentifier:@"myView"]; } - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemATindexPath:(NSIndexPath *)indexPath { NSString *urlString = [self.data objectATindex:indexPath.item]; MyCollectionViewCell *myView = [collectionView dequeueReusableCellWithReusEIDentifier:@"myView" forIndexPath:indexPath]; myView.urlString = urlString; [myView setNeedsDisplay]; return myView; } - (CGSizE)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemATindexPath:(NSIndexPath *)indexPath { return CGSizeMake(150,150); } - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return 1; } - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { return self.data.count; } @end
这是自定义UICollectionViewCell的实现.
#import "MyCollectionViewCell.h" #import <QuartzCore/QuartzCore.h> #import <AVFoundation/AVFoundation.h> @interface MyCollectionViewCell () @property (weak,nonatomiC) IBOutlet UIImageView *imageView; @end @implementation MyCollectionViewCell @synthesize urlString = _urlString; + (void)loadAsyncImageFromURL:(NSString *)urlString withCallBACk:(void (^)(UIImage *))callBACk { NSURL *url = [NSURL URLWithString:urlString]; dispatch_queue_t downloadQueue = dispatch_queue_create("com.example.downloadqueue",null); dispatch_async(downloadQueue,^{ NSData * imageData = [NSData dataWithContentsOfURL:url]; UIImage *image = [UIImage imageWithData:imageData]; dispatch_async(dispatch_get_main_queue(),^{ callBACk(imagE); }); }); } -(void) fadeInView:(UIView *)view WithSecondDuration:(doublE)duration { CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"opacity"]; animation.beginTime = 0; animation.duration = duration; animation.fromValue = [NSnumber numberWithFloat:0.0f]; animation.toValue = [NSnumber numberWithFloat:1.0f]; animation.removedOnCompletion = NO; animation.fillmode = kCAFillmodeBoth; animation.additive = NO; [view.layer addAnimation:animation forKey:@"opacityIN"]; } - (void) setUrlString:(NSString *)urlString { _urlString = urlString; self.imageView.image = nil; self.imageView.layer.opacity = 0; if (urlString) { [MyCollectionViewCell loadAsyncImageFromURL:urlString withCallBACk:^(UIImage *imagE) { self.imageView.image = image; [self fadeInView:self.imageView WithSecondDuration:.25]; }]; } } @end
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