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我正在构建一个使用 AVQueuePlayer 流式传输音频的应用程序。我将我的 AVAudioSession 设置为 AVAudioSessionCategoryPlayback 类别,并且我能够从 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,App Switcher 中的暂停/播放按钮也不会变为播放。音频暂停,但图标永远不会改变。你知道为什么会发生这种情况吗?

我还使用 MPMusicPlayerController 从 iPod 音乐播放器播放音乐。两个播放器总是被初始化,但是一次只有一个播放器。当应用程序打开时,如果我先从 MPMusicPlayerController 播放某些内容,则 AVQueuePlayer 不再有此暂停冲突。仅当您首先从 AVQueuePlayer 播放时才会出现此问题。我包含了代码来向您展示我在做什么。

仅供参考-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
}

有任何想法吗?

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1 回答 1

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我解决了这个问题。我正在向干扰此的 AVQueuePlayer/AVPlayerItems 添加多个观察者实例。

于 2013-05-07T18:06:51.157 回答