MediaPlayerErrorDomain Xode = -11800

Question

当前，我正在编写我的第一个xamarin跨平台应用程序。 我尝试添加视频背景，并在互联网上找到了以下指南：https://www.junian.net/xamarin-forms-video-background/

但是当我尝试在iOS模拟器上对其进行测试时，出现以下错误：

2019-01-12 02：27：54.095262-0800 RelationshipAppNew.iOS [1587：10185] [播放]用于解决错误Error Domain = AVFoundationErrorDomain Code = -11800“该操作无法完成“ UserInfo = {NSLocalizedFailureReason =发生未知错误（-101），NSLocalizedDescription =操作无法完成，NSUnderlyingError = 0x6000023a4a20 {Error Domain = NSOSStatusErrorDomain Code = -101”（null）“}}

2019-01-12 02：27：54.095800-0800 RelationshipAppNew.iOS [1587：10185] [回放]❗️解决方案无法解决错误：Error Domain = AVFoundationErrorDomain Code = -11800 “操作无法完成” UserInfo = {NSLocalizedFailureReason =发生未知错误（-101），NSLocalizedDescription =操作无法完成，NSUnderlyingError = 0x6000023a4a20 {Error Domain = NSOSStatusErrorDomain Code = -101“（null）”}}分辨率错误：（空）

2019-01-12 02：27：54.096289-0800 RelationshipAppNew.iOS [1587：10185] [Playback]❗️Playback失败并出现错误：Error Domain = AVFoundationErrorDomain Code = -11800“ The operation无法完成” UserInfo = {NSLocalizedFailureReason =发生未知错误（-101），NSLocalizedDescription =操作无法完成，NSUnderlyingError = 0x6000023a4a20 {Error Domain = NSOSStatusErrorDomain Code = -101“（null）”}}，无法解决（canResolve：否，allowsItemErrorResolution：否） 2019-01-12 02：27：54.190780-0800 RelationshipAppNew.iOS [1587：10185]通知：NSConcreteNotification 0x60000238a580 {name = MPMoviePlayerPlaybackDidFinishNotification;对象=; userInfo = {     MPMoviePlayerPlaybackDidFinishReasonUserInfoKey = 1;     error =“错误域= MediaPlayerErrorDomain代码= -11800 \”操作无法完成\“ UserInfo = {NSLocalizedDescription =操作无法完成}”; }}

2019-01-12 02：27：54.252088-0800 RelationshipAppNew.iOS [1587：10185] FinishReason：PlaybackError

这是iOS渲染器的代码：

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using RelationshipAppNew.Controls;
using RelationshipAppNew.iOS.Renderers;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
using Foundation;
using UIKit;
using MediaPlayer;

[assembly: ExportRenderer(typeof(Video), typeof(VideoRenderer))]
namespace RelationshipAppNew.iOS.Renderers
{
    class VideoRenderer : ViewRenderer<Video, UIView>
    {
        MPMoviePlayerController videoPlayer;
        NSObject notification = null;

        protected override void 
OnElementChanged(ElementChangedEventArgs<Video> e)
        {
            base.OnElementChanged(e);

            if (Control == null)
            {
                InitVideoPlayer();
            }
            if (e.OldElement != null)
            {
                // Unsubscribe
                notification?.Dispose();
            }
            if (e.NewElement != null)
            {
                // Subscribe
                notification = MPMoviePlayerController.Notifications.ObservePlaybackDidFinish((sender, args) =>
            {
                /* Access strongly typed args */
                Console.WriteLine("Notification: {0}", args.Notification);
                Console.WriteLine("FinishReason: {0}", args.FinishReason);

                Element?.OnFinishedPlaying?.Invoke();
            });
        }
    }

    void InitVideoPlayer()
    {

        var path = Path.Combine(NSBundle.MainBundle.BundlePath, Element.Source);

        if (!NSFileManager.DefaultManager.FileExists(path))
        {
            Console.WriteLine("Video not exist");
            videoPlayer = new MPMoviePlayerController();
            videoPlayer.ControlStyle = MPMovieControlStyle.None;
            videoPlayer.ScalingMode = MPMovieScalingMode.AspectFill;
            videoPlayer.RepeatMode = MPMovieRepeatMode.One;
            videoPlayer.View.BackgroundColor = UIColor.Clear;
            SetNativeControl(videoPlayer.View);
            return;
        }

        // Load the video from the app bundle.
        NSUrl videoURL = new NSUrl(path, false);

        // Create and configure the movie player.
        videoPlayer = new MPMoviePlayerController(videoURL);

        videoPlayer.ControlStyle = MPMovieControlStyle.None;
        videoPlayer.ScalingMode = MPMovieScalingMode.AspectFill;
        videoPlayer.RepeatMode = Element.Loop ? MPMovieRepeatMode.One : MPMovieRepeatMode.None;
        videoPlayer.View.BackgroundColor = UIColor.Clear;
        foreach (UIView subView in videoPlayer.View.Subviews)
        {
            subView.BackgroundColor = UIColor.Clear;
        }

        videoPlayer.PrepareToPlay();
        SetNativeControl(videoPlayer.View);
    }

    protected override void OnElementPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
    {
        base.OnElementPropertyChanged(sender, e);
        if (Element == null || Control == null)
            return;

        if (e.PropertyName == Video.SourceProperty.PropertyName)
        {
            InitVideoPlayer();
        }
        else if (e.PropertyName == Video.LoopProperty.PropertyName)
        {
            var liveImage = Element as Video;
            if (videoPlayer != null)
                videoPlayer.RepeatMode = Element.Loop ? MPMovieRepeatMode.One : MPMovieRepeatMode.None;
        }
    }
}
}

我认为MPMoviePlayerController出了点问题，但是我找不到故障。