MPMoviePlayerController中的多个通知

Question

是否可以在MPMoviePlayerController中有两个不同的播放通知？

我想用这些：

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(moviePlayBackDidFinish:)
                                             name:MPMoviePlayerPlaybackDidFinishNotification
                                           object:self.moviePlayer];

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(MPMoviePlayerPlaybackDidChange:)
                                             name:MPMoviePlayerPlaybackStateDidChangeNotification
                                           object:self.moviePlayer];

我确实设法让它们工作但是当我一起使用它们时，只调用MPMoviePlayerPlaybackStateDidChangeNotification。

请告知。