在iOS中控制来自控制中心的音频网址的问题

Question

我正在AVAudioPlayer中播放来自url的音频。我试图控制来自控制中心和锁定屏幕的音频。我可以控制搜索和前进，后退功能，但我无法控制控制中心的播放/暂停功能。

    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    [self becomeFirstResponder];

    MPRemoteCommandCenter *remoteCommandCenter = [MPRemoteCommandCenter       sharedCommandCenter];


    [[remoteCommandCenter skipForwardCommand] addTarget:self action:@selector(skipForward)];
    [[remoteCommandCenter togglePlayPauseCommand] addTarget:self action:@selector(togglePlayPause)];
    [[remoteCommandCenter skipBackwardCommand] addTarget:self action:@selector(skipBackward)];


    MPNowPlayingInfoCenter *playingInfoCenter = [MPNowPlayingInfoCenter defaultCenter];

    NSMutableDictionary *songInfo = [[NSMutableDictionary alloc] init];


    [songInfo setObject:@"your song" forKey:MPMediaItemPropertyTitle];
    [songInfo setObject:@"your artist" forKey:MPMediaItemPropertyArtist];
    [songInfo setObject:@"your album" forKey:MPMediaItemPropertyAlbumTitle];
    [songInfo setObject:@"0" forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];
    [songInfo setObject:@"600" forKey:MPMediaItemPropertyPlaybackDuration];

    [playingInfoCenter setNowPlayingInfo:songInfo];