小编Сер*_*нич的帖子

我下载gif图像并添加到集合视图时遇到问题. gif图像下载得很好,但是当我尝试非常快速地滚动时它会崩溃

请帮忙.我有两个解决方案

    /*
    cellForGif.layer.borderColor = [[UIColor colorWithRed:54.0/255.f green:56.0/255.f blue:67.0/255.f alpha:1.0]CGColor];
    cellForGif.layer.borderWidth = 0.7;
    FLAnimatedImage __block *gifImage = nil;
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        gifImage = [[FLAnimatedImage alloc] initWithAnimatedGIFData:[NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"%li", (long)indexPath.row] ofType:@"gif"]]];

        dispatch_async(dispatch_get_main_queue(), ^{

            cellForGif.gifImage.animatedImage = gifImage;
            cellForGif.linkOnGif = [self.linksArrayOnGifs objectAtIndex:indexPath.row];
           //gifImage = nil;
        });
    });
    return cellForGif;
     */
    cellForGif.layer.borderColor = [[UIColor colorWithRed:54.0/255.f green:56.0/255.f blue:67.0/255.f alpha:1.0]CGColor];
    cellForGif.layer.borderWidth = 0.7;
    FLAnimatedImage *gifImage = nil;
        gifImage = [[FLAnimatedImage alloc] initWithAnimatedGIFData:[NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"%li", (long)indexPath.row] ofType:@"gif"]]];
            cellForGif.gifImage.animatedImage = …

我正在尝试使用SWITCH和GCD加载我的数组,以便不停止主线程.但Xcode无法构建我的代码.请任何人解释一下为什么我可以用这种方式使用GCD？

switch (number) {
        case 0:
            //case 0:exercise_name="??????";
            break;

        case 1:
            dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                @synchronized (self.handsMassage){
                    /*
                     NSURL* musicFile = [NSURL fileURLWithPath:[[NSBundle mainBundle]                                                                                                                  pathForResource:@"sound" ofType:@"wav"]];
                     _click  = [[AVAudioPlayer alloc] initWithContentsOfURL:musicFile  error:nil];
                     self.click.delegate = self;
                     */
                    for (int i = 1; i <= 22; i++) {
                        [self.arrayOfExercise addObject:(id)[UIImage imageNamed:[NSString stringWithFormat:@"ml_%i", i]].CGImage];
                    }
                }
                dispatch_async(dispatch_get_main_queue(), ^{
                    [self.playButton setHidden:NO];
                });
            });
            break;

        case 2:
            dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                @synchronized (self.loinMassage){
                    /*
                     NSURL* musicFile = [NSURL fileURLWithPath:[[NSBundle mainBundle]                                                                                                                  pathForResource:@"sound" ofType:@"wav"]];
                     _click  = [[AVAudioPlayer alloc] initWithContentsOfURL:musicFile …