如何在Xamarin.iOS应用中播放youtube视频

using Google.Apis.Auth.OAuth2;
using Google.Apis.Services;
using Google.Apis.Util.Store;
using Google.Apis.YouTube.v3;
using System;
using System.IO;
using System.Threading;

namespace YourNamespace
{
    public class YoutubeService
    {
        private static readonly string[] Scopes = { YouTubeService.Scope.YoutubeReadonly };
        private static readonly string ApplicationName = "Your Application Name";
        private static readonly string CredentialsPath = "credentials.json";

        public static YouTubeService GetYouTubeService()
        {
            UserCredential credential;

            using (var stream = new FileStream(CredentialsPath, FileMode.Open, FileAccess.Read))
            {
                string credPath = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
                credPath = Path.Combine(credPath, ".credentials/youtube-dotnet-quickstart.json");

                credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
                    GoogleClientSecrets.Load(stream).Secrets,
                    Scopes,
                    "user",
                    CancellationToken.None,
                    new FileDataStore(credPath, true)).Result;
            }

            return new YouTubeService(new BaseClientService.Initializer()
            {
                HttpClientInitializer = credential,
                ApplicationName = ApplicationName
            });
        }
    }
}

using Foundation;
using Google.Apis.YouTube.v3;
using Google.Apis.YouTube.v3.Data;
using UIKit;

namespace YourNamespace
{
    public partial class YoutubePlayerViewController : UIViewController
    {
        private YouTubeService youtubeService;

        public YoutubePlayerViewController() : base("YoutubePlayerViewController", null)
        {
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            youtubeService = YoutubeService.GetYouTubeService();
            PlayYoutubeVideo("YOUR_YOUTUBE_VIDEO_ID");
        }

        private void PlayYoutubeVideo(string videoId)
        {
            var videoRequest = youtubeService.Videos.List("snippet");
            videoRequest.Id = videoId;

            var videoResponse = videoRequest.Execute();
            var video = videoResponse.Items[0];

            var playerViewController = new XCDYouTubeKit.XCDYouTubeVideoPlayerViewController(video.Id);
            PresentViewController(playerViewController, true, null);
        }
    }
}

using Foundation;
using UIKit;

namespace YourNamespace
{
    public partial class MainViewController : UIViewController
    {
        public MainViewController() : base("MainViewController", null)
        {
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
        }

        partial void PlayYoutubeVideoButton_TouchUpInside(UIButton sender)
        {
            var youtubePlayerViewController = new YoutubePlayerViewController();
            PresentViewController(youtubePlayerViewController, true, null);
        }
    }
}