在后台媒体播放期间响应MPMoviePlayerController通知

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // 注册后台播放功能
    do {
        try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default, options: [])
        try AVAudioSession.sharedInstance().setActive(true)
    } catch {
        print("后台播放功能注册失败：\(error)")
    }
    
    return true
}

import MediaPlayer

class ViewController: UIViewController {
    var moviePlayer: MPMoviePlayerController?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建MPMoviePlayerController对象
        let url = URL(string: "http://example.com/video.mp4") // 替换为实际的媒体文件URL
        moviePlayer = MPMoviePlayerController(contentURL: url)
        
        // 添加观察者监听通知
        NotificationCenter.default.addObserver(self, selector: #selector(moviePlayerDidEnterBackground), name: NSNotification.Name.MPMoviePlayerDidEnterFullscreen, object: nil)
    }
    
    @objc func moviePlayerDidEnterBackground(notification: NSNotification) {
        // 在后台播放期间响应通知的处理逻辑
        // 可以在这里暂停播放、保存播放进度等操作
    }
    
    deinit {
        // 移除观察者
        NotificationCenter.default.removeObserver(self)
    }
}