AVQueue播放器正在暂停，但播放图标不会消失

Question

我正在构建一个使用AVQueuePlayer流式音频的应用程序。我有我的AVAudioSession与AVAudioSessionCategoryPlayback类别设置，我能够从remoteControlReceivedWithEvent:接收事件。但是，当我暂停音频会话时，状态栏中的图标不会消失，应用切换器中的暂停/播放按钮也不会变为播放。音频暂停，但图标从未改变。你知道为什么会这样吗?

我还使用MPMusicPlayerController来播放iPod音乐播放器中的音乐。两个玩家总是初始化，但是一次只有一个玩家。当应用程序打开时，如果我先从MPMusicPlayerController播放一些东西，AVQueuePlayer就不再有这个暂停冲突了。它只有在你首先从AVQueuePlayer播放时才有这个问题。我附上代码是为了向您展示我在做什么。

供参考-我的MPMusicController是self.musicPlayer。我的AVQueuePlayer是self。radioplayer。暂停后，我的AVQueuePlayer的状态是AVPlayerStatusReadyToPlay。

- (void)viewDidLoad {
    [super viewDidLoad];
    self.musicPlayer = [MPMusicPlayerController iPodMusicPlayer];
    self.musicPlayer.nowPlayingItem = self.currentSong;
    self.musicPlayer.shuffleMode = MPMusicShuffleModeSongs;
    self.musicPlayer.repeatMode = MPMusicRepeatModeAll;
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback withOptions:nil error:nil];
    [[AVAudioSession sharedInstance] setActive:YES error:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(radioItemDidReachEnd:) name:AVPlayerItemDidPlayToEndTimeNotification object:[_radioPlayer currentItem]];
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    [self becomeFirstResponder];
}
- (void)viewWillDisappear:(BOOL)animated
{
    [self resignFirstResponder];
    if (self.source == LIBRARY)
    {
        [self.parentDelgate reloadInformation];
    }
}
- (void)viewDidAppear:(BOOL)animated
{
    if (self.source == RADIO)
    {
        // Code that sets the URLs for the AVQueuePlayer
        [self initializeMusicPlayer];
        [self prepareRadioPlayer];
    }
    else if ( self.source == LIBRARY ) {
        if ( self.currentSong != self.musicPlayer.nowPlayingItem || self.playlist != nil)
        {
            [self initializeMusicPlayer];
            self.musicPlayer.nowPlayingItem = self.currentSong;
        }
    }
}
- (void)initializeMusicPlayer {
    if ( self.source == LIBRARY )
    {
        [self.musicPlayer setQueueWithItemCollection:[MPMediaItemCollection collectionWithItems:(NSArray *)self.tracks]];
        if ([self.radioPlayer rate] != 0.0)
            [self.radioPlayer pause];
        [self.musicPlayer play];
        self.status = PLAYING;
    }
    else if ( self.source == RADIO )
    {
        if ( self.musicPlayer.playbackState == MPMusicPlaybackStatePlaying )
            [self.musicPlayer pause];
    }
}
- (IBAction)pausePressed:(UIButton *)sender {
    if ( self.source == LIBRARY )
    {
        [self.musicPlayer pause];
    }
    else if (self.source == RADIO)
    {
        [self.radioPlayer pause];
    }
    [self onStatePaused];
}
- (void)onStatePaused {
    // UI Stuff
}
- (void)endSession {
    [self.musicPlayer stop];
    [self.radioPlayer pause];
    [self.radioPlayer removeAllItems];
    // Present different view
}

任何想法?

Answer 1

我找到了问题所在。我在AVQueuePlayer/AVPlayerItems中添加了多个观察者实例，这干扰了这一点。