我有一个令人困惑的问题。 我在课堂上声明了这些变量:
var audioPlayer = AVPlayer()
var videoPlayer = AVPlayer()
var videoLayer = AVPlayerLayer()
我有以下代码用于添加videoPlayer的容器:
let aspectHeight = view.frame.width * 9/16
let viewFrame = CGRect(x: 5, y: 0, width: view.frame.width - 10, height: aspectHeight)
let layerFrame = CGRect(x: 0, y: 0, width: view.frame.width - 10, height: aspectHeight)
videoPlayerContainerView.frame = viewFrame
videoPlayerViewController.frame = viewFrame
videoLayer.frame = layerFrame
videoLayer.backgroundColor = UIColor.green.cgColor
videoPlayerContainerView.layer.addSublayer(videoLayer)
videoPlayerContainerView.addSubview(videoPlayerViewController)
videoElementContainerView.addView(newView: videoPlayerContainerView)
我也有此功能(我将传递的参数替换为临时URL)
@IBAction func pausePlayVideo(_ sender: CustomButton) {
let videoString = videoSourceURL + (sender.paramaters["thisVideoURL"] as! String)
let videoURL = URL(string: "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4")
videoPlayer = AVPlayer(url: videoURL!)
videoLayer = AVPlayerLayer(player: videoPlayer)
videoPlayer.play()
}
我在这里叫它
pausePlayButton.addTarget(self, action: #selector(ModuleLessonElementsViewController.pausePlayVideo(_:)), for: .touchUpInside)
pausePlayButton.paramaters["thisVideoURL"] = content
以下是视图: The layer was added, the audio plays but the video does not.
按下按钮时,将播放音频,但不会播放视频。我在这里错过重要的东西吗?
答案 0 :(得分:0)
这很简单。早期,您说:
videoPlayerContainerView.layer.addSublayer(videoLayer)
好的,因此您有一个播放器层videoLayer
,该播放器层没有任何播放器,并且现在在界面中。很好
稍后,当按下按钮时,您会说:
@IBAction func pausePlayVideo(_ sender: CustomButton) {
// ...
videoLayer = AVPlayerLayer(player: videoPlayer)
videoPlayer.play()
}
那到底发生了什么?您在videoLayer
中放弃了对先前添加到界面中的图层的引用,并用它替换了刚刚创建的全新播放器图层,该界面在界面中为 not 。好的,因此您与播放器关联的视频层不在界面中,因此您可以听到播放器,但看不到任何东西。