MPRemoteCommandCenter播放/暂停命令无法正确更新

问题描述

我已经设置了播放/暂停按钮，并且为每个按钮都添加了目标事件，但是当我在模拟器中单击按钮时，它总是调用播放按钮的目标事件，并且按钮的图像从播放到暂停都没有正确更新，反之亦然。有人对此有想法吗？

注意：要播放/暂停音频，我使用了Plugin.MediaManager.Forms nuget（版本0.9.7）

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

        var song = CarPlaylist[indexPath.Section].episodes[indexPath.Row];
        var NowPlayingInfoCenter = MPNowPlayingInfoCenter.DefaultCenter;

        MPNowPlayingInfo playingInfo = new MPNowPlayingInfo();
        playingInfo.Title = song.Title;
        playingInfo.Artist = song.Editor;
        playingInfo.PlaybackDuration = song.Duration.TotalSeconds; //provide time in seconds
        playingInfo.MediaType = MPNowPlayingInfoMediaType.Audio;
        playingInfo.Artwork = new MPMediaItemArtwork(image: ExtractArtWork.UIImageFromUrl(song.ArtWork));
        playingInfo.AssetUrl = new NSUrl(song.FileUrl.AbsolutePath);
        playingInfo.PlaybackRate = song.IsPlaying ? 1.0 : 0.0;
        NowPlayingInfoCenter.NowPlaying = playingInfo;

        var currentPlayItemId = episode.podcastId.ToString();
        string[] identifier = new string[1];
        identifier[0] = currentPlayItemId;

        contentManager = MPPlayableContentManager.Shared;
        contentManager.NowPlayingIdentifiers = identifier;
        contentManager.DataSource = new AppDelegateDataSource(CarPlaylist);

        var commandCenter = MPRemoteCommandCenter.Shared;
        commandCenter.PlayCommand.Enabled = true;
        commandCenter.PauseCommand.Enabled = true;
        commandCenter.PlayCommand.AddTarget(PlayButton);
        commandCenter.PauseCommand.AddTarget(PauseButton);

        completionHandler(null);

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

public MPRemoteCommandHandlerStatus PlayButton(MPRemoteCommandEvent commandEvent)
{
    //Logic to update app UI to play mode and play audio
    return MPRemoteCommandHandlerStatus.Success;
}

public MPRemoteCommandHandlerStatus PauseButton(MPRemoteCommandEvent commandEvent)
{
    //Logic to update app UI to pause mode and pause audio
    return MPRemoteCommandHandlerStatus.Success;
}

解决方法

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