每当我播放一首曲目然后移动到背景时,我都无法获得这些通知中的任何一个在我的应用程序中触发。有谁知道为什么或如何?MPMusicPlayerControllerPlaybackStateDidChangeNotification在后台中
self.player = [MPMusicPlayerController applicationMusicPlayer];
[self.player beginGeneratingPlaybackNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handlePlaybackStateChanged:) name:MPMusicPlayerControllerPlaybackStateDidChangeNotification object:self.player ];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleItemChanged:) name:MPMusicPlayerControllerNowPlayingItemDidChangeNotification object:self.player ];
启用后台音频模式**(项目设置>功能>背景模式>音频和AirPlay)** –