AVPlayer - UILabel 在视频上不可见

    NSString *urlPath;
    NSURL *videoUrl;

    urlPath = [[NSBundle mainBundle] pathForResource:@"fogLoop" ofType:@"mp4"];
    videoUrl = [NSURL fileURLWithPath:urlPath];

    avPlayer = [AVPlayer playerWithURL:videoUrl];
    avPlayerLayer = [AVPlayerLayer playerLayerWithPlayer:avPlayer];

    avPlayerLayer.frame = videoView.layer.bounds;

    avPlayerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;

    [videoView.layer addSublayer: avPlayerLayer];

    avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(playerItemDidReachEnd:)
                                                 name:AVPlayerItemDidPlayToEndTimeNotification
                                               object:[avPlayer currentItem]];

    [avPlayer play];

我在这个视图上有几个 UILabel。我真的只想将视频作为背景元素。通过这段代码，它似乎可以覆盖所有 UI 元素。我如何让它进入后台？

您可以使用视图图层（它是 CALayer 对象）的 zPosition 属性来更改视图的 z-index。

 theView.layer.zPosition = 1;

并将标签放在前面