iOS 使用 FLAnimatedImageView 播放GIF，并控制播放一次

有时候会播放本地gif 图片，并只播放一次, 我们这里使用FLAnimationImageView 实现

修改FLAnimationImageView

添加forcePause 属性

@interface FLAnimatedImageView : UIImageView

@property (nonatomic, assign) BOOL forcePaused;

@end

计时器方法

            self.displayLink = [CADisplayLink displayLinkWithTarget:weakProxy selector:@selector(displayDidRefresh:)];

修改计时器方法
添加下面这句

  if (self.forcePaused) {
        self.image = self.currentFrame;
        return;
    }

设置结束回调

- (FLAnimatedImageView *)imgView
{
    if (!_imgView) {
        _imgView = [[FLAnimatedImageView alloc] init];
        __weak  FLAnimatedImageView *weakImgView = _imgView;
        _imgView.loopCompletionBlock = ^(NSUInteger loopCountRemaining) {
            weakImgView.forcePaused = YES;
            [weakImgView stopAnimating];
        };
    }
    return _imgView;
}

- (void)displayDidRefresh:(CADisplayLink *)displayLink
{
    // If for some reason a wild call makes it through when we shouldn't be animating, bail.
    // Early return!
    if (!self.shouldAnimate) {
        FLLog(FLLogLevelWarn, @"Trying to animate image when we shouldn't: %@", self);
        return;
    }
    
    if (self.forcePaused) {
        self.image = self.currentFrame;
        return;
    }
   。。。。

展示gif资源

        NSString *path = [[NSBundle mainBundle] pathForResource:@"animation_24hlive" ofType:@"gif"];
        NSData *gifData = [NSData dataWithContentsOfFile:path];
        FLAnimatedImage *image = [FLAnimatedImage animatedImageWithGIFData:gifData];
        _animationView.animatedImage = image;