如何在CarPlay Xamarin.iOS中制作NowPlay屏幕？以及如何在MPPlayableContentManager中设置nowPlayingIdentifiers属性？

如何解决如何在CarPlay Xamarin.iOS中制作NowPlay屏幕？以及如何在MPPlayableContentManager中设置nowPlayingIdentifiers属性？

我已经在Xamarin.Forms中创建了音频应用程序，为了播放音频，我使用了MediaManager插件。

现在，我想使其与CarPlay兼容。

CarPlay音频应用程序由MPPlayableContentManager控制。您需要实现MPPlayableContentDelegate和 MPPlayableContentDatasource协议以便与CarPlay连接。用户界面由CarPlay控制-您所需要做的就是输入数据标签和表格（数据源）并响应可播放项（委托）。

我已经将所有必需的CarPlay api用于音频应用程序，但是问题是：

现在无法在CarPlay模拟器中播放屏幕。
如何在MPContentItem中设置ArtWork？

MPPlayableContentDelegate类

public class PlayableContentDelegate : MPPlayableContentDelegate
{
    public override void PlayableContentManager(MPPlayableContentManager contentManager,NSIndexPath indexPath,Action<NSError> completionHandler)
    {
        dispatchQueue.MainQueue.dispatchAsync(() =>
        {
            UIApplication.SharedApplication.BeginReceivingRemoteControlEvents();
            completionHandler(null);
            UIApplication.SharedApplication.EndReceivingRemoteControlEvents();

            UIApplication.SharedApplication.BeginReceivingRemoteControlEvents();
        });
    }

    [Export("playableContentManager:initiatePlaybackOfContentItemAtIndexPath:completionHandler:")]
    public override void InitiatePlaybackOfContentItem(MPPlayableContentManager contentManager,Action<NSError> completionHandler)
    {
        try
        {
            dispatchQueue.MainQueue.dispatchAsync(() =>
            {
                UIApplication.SharedApplication.BeginReceivingRemoteControlEvents();

                var itemToPlay = BaseSettingsService.CurrentPlayList[indexPath.Row];
                var NowPlayingInfoCenter = MPNowPlayingInfoCenter.DefaultCenter;

                MPNowPlayingInfo playingInfo = new MPNowPlayingInfo();
                playingInfo.Title = itemToPlay.Title;
                playingInfo.Artist = itemToPlay.Editor;
                playingInfo.AlbumTitle = "1989";
                playingInfo.Genre = "Pop";
                playingInfo.PlaybackDuration = 231;
                playingInfo.PlaybackRate = 22;
                playingInfo.PersistentID = (ulong)111111;
                playingInfo.PlaybackQueueIndex = 3;
                playingInfo.PlaybackQueueCount = BaseSettingsService.CurrentPlayList.Count;
                playingInfo.IsLiveStream = false;
                playingInfo.MediaType = MPNowPlayingInfoMediaType.Audio;
                NowPlayingInfoCenter.NowPlaying = playingInfo;

                var id = itemToPlay.podcastId.ToString();
                string[] s1 = new string[1];
                s1[0] = id;

                contentManager.NowPlayingIdentifiers = s1;

                completionHandler(null);

                UIApplication.SharedApplication.EndReceivingRemoteControlEvents();
            });
        }
        catch (Exception ex)
        {
            Debug.WriteLine(ex.Message);
        }
    }

    public override nuint RetainCount { get; }

    public override void ContextUpdated(MPPlayableContentManager contentManager,MPPlayableContentManagerContext context)
    {
        try
        {
            //base.ContextUpdated(contentManager,context);
        }
        catch (Exception ex)
        {
            Debug.WriteLine(ex.Message);
        }
    }

    public override NSDictionary GetDictionaryOfValuesFromKeys(Nsstring[] keys)
    {
        return base.GetDictionaryOfValuesFromKeys(keys);
    }
}

MPPlayableContentDataSource

public class AppDelegateDataSource : MPPlayableContentDataSource
{
    public override MPContentItem ContentItem(NSIndexPath indexPath)
    {
        if (indexPath.Length == 1)
        {
            var item = new MPContentItem("PlayList");
            item.Title = "PlayList";
            item.Subtitle = "Hello";
            item.Container = true;
            item.Playable = false;
            return item;
        }
        else
        {
            var play = CurrentPlayList[indexPath.Row];
            var item = new MPContentItem(play.podcastId);
            item.Title = play.Title;
            item.Subtitle = play.Editor;
            item.Playable = true;
            return item;
        }
    }

    public override nint NumberOfChildItems(NSIndexPath indexPath)
    {
        if (indexPath.GetIndexes().Length == 0)
            return 1;
        else
            return CurrentPlayList.Count;
    }
}

所以，问题是我现在应该如何应对可玩物品？

任何人都知道我缺少什么或必须纠正哪个错误？任何帮助将不胜感激，谢谢。

解决方法

要获得 NowPlaying 屏幕，您必须正确设置两件事。

MPRemoteCommandCenter

var commandCenter = MPRemoteCommandCenter.Shared;
commandCenter.PlayCommand.Enabled = true;
commandCenter.StopCommand.Enabled = true;

MPPlayableContentManager.NowPlayingIdentifiers

var urlId = "11111";
string[] identifier = new string[1];
identifier[0] = urlId;

contentManager = MPPlayableContentManager.Shared;
contentManager.NowPlayingIdentifiers = identifier;