Question

我正在尝试在以前加载的子视图下面添加函数setupPlayerView的子图层。子视图的加载速度比图层快，因为创建图层的函数使用的字符串是从另一个类UIViewController修改的（我想加载单个视频）。我在stackoverflow上找到了答案，但.insertSublayer(playerLayer, below: self.controlsContainerView.layer)的建议解决方案对我不起作用。如何确保视频图层依次位于我的所有其他子视图（如controlsContainerView及其子视图（例如activityIndicatorView）下？

这就是我现在所得到的：

class PlayerView: UIView {

var urlString: String? {
    didSet {
        setupPlayerView()
    }
}

override init(frame: CGRect){

    super.init(frame: frame)

    //although the function is called immediately it is not the "lower" than everything else
    setupPlayerView()

    //add subview with controls (e.g. spinner)
    controlsContainerView.frame = frame
    addSubview(controlsContainerView)

    //add to subview and center spinner in subview
    controlsContainerView.addSubview(activityIndicatorView) // (spinner)
    controlsContainerView.addSubview(whiteView)

    //...
}

//... irrelevant code (closures like `activityIndicatorView` and `whiteView`)

//setup video player
func setupPlayerView() {

    if let urlString = self.urlString, let videoURL = NSURL(string: urlString){

        print(urlString)

        //player's video
        if self.player == nil {
            player = AVPlayer(url: videoURL as URL)
        }

        //add sub-layer
        let playerLayer = AVPlayerLayer(player: player)
        playerLayer.frame = self.frame
        self.controlsContainerView.layer.insertSublayer(playerLayer, below: self.controlsContainerView.layer)

        //when are frames actually rendered (when is video loaded so one can remove spinner)
        player?.addObserver(self, forKeyPath: "currentItem.loadedTimeRanges", options: .new, context: nil)

    }

}

对于那些感兴趣的人：我在另一个类（ViewController）中以下列方式更改urlString：

videoPlayerView.urlString = videoUrl //videoUrl being some link to a video source

在子视图下添加图层

0 个答案: