使用MPMusicPlayerController播放MPMediaItemCollection，如何在播放结束时获取事件

Question

我正在使用MPMusicPlayerController在MPMediaItems中播放MPMediaItemCollection。如何在MPMediaItem完成播放时触发事件？

谢谢！ InterDev中

Answer 1

注册MPMusicPlayerControllerPlaybackStateDidChangeNotification通知：

[notificationCenter addObserver:self selector:@selector(handlePlaybackStateChanged:) name:MPMusicPlayerControllerPlaybackStateDidChangeNotification object:self.musicPlayer];

并告诉你的musicPlayerController生成这些通知：

[self.musicPlayerController beginGeneratingPlaybackNotifications];

在handlePlaybackStateChanged:中，您可以查看musicPlayerController的playbackState属性：

- (void)handlePlaybackStateChanged:(NSNotitication*)notification
{
    if (self.musicPlayerController.playbackState == MPMusicPlaybackStateStopped ||
        self.musicPlayerController.playbackState == MPMusicPlaybackStateInterrupted ||
        self.musicPlayerController.playbackState == MPMusicPlaybackStatePaused) {
        // do your stuff
    }
}