Xamarin iOS 音频和视频仍在后台播放？

Question

我使用 ISimpleAudioPlayer 和 Libvlc 在 Xamarin 窗体项目中播放音频和视频。但对于 iOS，即使应用程序最小化或屏幕锁定，音频和视频仍在播放。我设法通过使用在android部分停止它：

protected override void OnDisappearing()
        {
            base.OnDisappearing();
            if (_audioPlayer != null)
            {
                if (_audioPlayer.IsPlaying)
                {
                    _audioPlayer.Stop();
                }
            }
        }

// 视频

protected override void OnDisappearing()
        {
            myvideo.MediaPlayer.Stop();

            base.OnDisappearing();
            MessagingCenter.Send(this, "SetLandscapeModeOff");
            MessagingCenter.Unsubscribe<HomeVideoPage>(this, "SetLandscapeModeOff");
            
        }

我的 AppDelegate.cs 是：

namespace AppTemplateDS.iOS
{
    // The UIApplicationDelegate for the application. This class is responsible for launching the 
    // User Interface of the application, as well as listening (and optionally responding) to 
    // application events from iOS.
    [Register("AppDelegate")]
    public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
    {
        //
        // This method is invoked when the application has loaded and is ready to run. In this 
        // method you should instantiate the window, load the UI into it and then make the window
        // visible.
        //
        // You have 17 seconds to return from this method, or iOS will terminate your application.
        //
        public override bool FinishedLaunching(UIApplication app, NSDictionary options)
        {
            LibVLCSharpFormsRenderer.Init();

            global::Xamarin.Forms.Forms.Init();
            LoadApplication(new App());

            return base.FinishedLaunching(app, options);
        }

    }
}

注意：后台模式功能在 iOS Xamarin 项目中已停用。

请帮忙