AVPlayer在离开视图时暂停视频。

import AVFoundation

class ViewController: UIViewController {
    var player: AVPlayer?

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建AVPlayer对象并加载视频资源
        let videoURL = URL(string: "https://example.com/video.mp4")
        let playerItem = AVPlayerItem(url: videoURL!)
        player = AVPlayer(playerItem: playerItem)
        
        // 将AVPlayer的Layer添加到视图中
        let playerLayer = AVPlayerLayer(player: player)
        playerLayer.frame = view.bounds
        view.layer.addSublayer(playerLayer)
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        
        // 在视图即将离开时暂停视频播放
        player?.pause()
    }
}