//要引入ImageIO庫#import <ImageIO/ImageIO.h>//解析gif文件數據的方法 block中會將解析的數據傳遞出來-(void)getGifImageWithUrk:(NSURL *)url    returnData:(void(^)(NSArray<UIImage *> * imageArray,        NSArray<NSNumber *>*timeArray,        CGFloat totalTime,        NSArray<NSNumber *>* widths,        NSArray<NSNumber *>* heights))dataBlock{ //通過文件的url來將gif文件讀取為圖片數據引用 CGImageSourceRef source = CGImageSourceCreateWithURL((CFURLRef)url, NULL); //獲取gif文件中圖片的個數 size_t count = CGImageSourceGetCount(source); //定義一個變量記錄gif播放一輪的時間 float allTime=0; //存放所有圖片 NSMutableArray * imageArray = [[NSMutableArray alloc]init]; //存放每一幀播放的時間 NSMutableArray * timeArray = [[NSMutableArray alloc]init]; //存放每張圖片的寬度 （一般在一個gif文件中，所有圖片尺寸都會一樣） NSMutableArray * widthArray = [[NSMutableArray alloc]init]; //存放每張圖片的高度 NSMutableArray * heightArray = [[NSMutableArray alloc]init]; //遍歷 for (size_t i=0; i<count; i++) {  CGImageRef image = CGImageSourceCreateImageAtIndex(source, i, NULL);  [imageArray addObject:(__bridge UIImage *)(image)];  CGImageRelease(image);  //獲取圖片信息  NSDictionary * info = (__bridge NSDictionary*)CGImageSourceCopyPropertiesAtIndex(source, i, NULL);  CGFloat width = [[info objectForKey:(__bridge NSString *)kCGImagePropertyPixelWidth] floatValue];  CGFloat height = [[info objectForKey:(__bridge NSString *)kCGImagePropertyPixelHeight] floatValue];  [widthArray addObject:[NSNumber numberWithFloat:width]];  [heightArray addObject:[NSNumber numberWithFloat:height]];  NSDictionary * timeDic = [info objectForKey:(__bridge NSString *)kCGImagePropertyGIFDictionary];  CGFloat time = [[timeDic objectForKey:(__bridge NSString *)kCGImagePropertyGIFDelayTime]floatValue];  allTime+=time;  [timeArray addObject:[NSNumber numberWithFloat:time]];  CFRelease(info); } CFRelease(source); dataBlock(imageArray,timeArray,allTime,widthArray,heightArray);}

-(void)yh_setImage:(NSURL *)imageUrl{  __weak id __self = self;  [self getGifImageWithUrk:imageUrl returnData:^(NSArray<UIImage *> *imageArray, NSArray<NSNumber *> *timeArray, CGFloat totalTime, NSArray<NSNumber *> *widths, NSArray<NSNumber *> *heights) {   //添加幀動畫   CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];   NSMutableArray * times = [[NSMutableArray alloc]init];   float currentTime = 0;   //設置每一幀的時間占比   for (int i=0; i<imageArray.count; i++) {    [times addObject:[NSNumber numberWithFloat:currentTime/totalTime]];    currentTime+=[timeArray[i] floatValue];   }   [animation setKeyTimes:times];   [animation setValues:imageArray];   [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]];   //設置循環   animation.repeatCount= MAXFLOAT;   //設置播放總時長   animation.duration = totalTime;   //Layer層添加   [[(UIImageView *)__self layer]addAnimation:animation forKey:@"gifAnimation"];  }];}

 UIImageView * imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0,0 , 320, 200)]; NSURL * url = [[NSURL alloc]initFileURLWithPath:[[NSBundle mainBundle] pathForResource:imageName ofType:nil]]; [imageView yh_setImage:url]; [self.view addSubview:imageView];

 //讀取gif數據   NSData *gifData = [NSData dataWithContentsOfURL:imageUrl];  UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];  //取消回彈效果  webView.scrollView.bounces=NO;  webView.backgroundColor = [UIColor clearColor];  //設置縮放模式  webView.scalesPageToFit = YES;  //用webView加載數據  [webView loadData:gifData MIMEType:@"image/gif" textEncodingName:nil baseURL:nil];