Xamarin.ios 单触式情节串连板MPMoviePlayerController

此代码在非情节提要环境中工作，但仅在情节提要ViewController上运行时显示黑屏。不知道会有什么不同。欢迎提出建议

public partial class videoVC : UIViewController
{

    MPMoviePlayerController mp = new MPMoviePlayerController();

    public videoVC (IntPtr handle) : base (handle)
    {
    }

    public override void ViewDidLoad ()
    {
        base.ViewDidLoad ();
        this.buttonPlay.TouchUpInside += delegate {
        try{

            mp = new MPMoviePlayerController(NSUrl.FromFilename("videos/file.m4v"));
            mp.AllowsAirPlay = true;
            this.View.AddSubview(mp.View);
            mp.SetFullscreen(true,true);
            mp.PrepareToPlay();
            mp.Play();

            }catch{

            Console.WriteLine("There was a problem playing back Video");

            }       

        };

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是否将file.m4v的Build Action属性设置为Content