关闭应用程序的Swift AVPlayerViewController Done按钮

import AVKit

class ViewController: UIViewController {
    var playerViewController: AVPlayerViewController?

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建AVPlayerViewController实例
        playerViewController = AVPlayerViewController()
        
        // 设置要播放的音视频资源
        if let videoURL = Bundle.main.url(forResource: "video", withExtension: "mp4") {
            let player = AVPlayer(url: videoURL)
            playerViewController?.player = player
        }
    }
    
    @IBAction func playButtonTapped(_ sender: UIButton) {
        if let playerViewController = playerViewController {
            // 呈现AVPlayerViewController
            present(playerViewController, animated: true, completion: nil)
            
            // 监听AVPlayerViewController的didFinishDismissal通知
            NotificationCenter.default.addObserver(self, selector: #selector(playerDidFinishDismissal), name: .AVPlayerViewControllerDidFinishDismissal, object: nil)
        }
    }
    
    @objc func playerDidFinishDismissal() {
        // 关闭播放器界面
        playerViewController?.dismiss(animated: true, completion: nil)
        
        // 移除通知观察者
        NotificationCenter.default.removeObserver(self, name: .AVPlayerViewControllerDidFinishDismissal, object: nil)
    }
}