iphone - 使用MPMusicPlayerController播放MPMediaItemCollection，如何获取播放结束时的事件

Question

我正在使用 MPMusicPlayerController 播放 MPMediaItemCollection 中的 MPMediaItems。当 MPMediaItem 播放完毕时，如何触发事件？

Answer 1

注册MPMusicPlayerControllerPlaybackStateDidChangeNotification通知:

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

并告诉您的 musicPlayerController 生成这些通知:

[self.musicPlayerController beginGeneratingPlaybackNotifications];

在handlePlaybackStateChanged:中，您可以检查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
    }
}