获取显示在MPNowPlayingInfoCenter的nowPlayingInfo中的元数据(锁定屏幕和遥控器)

问题描述

感谢您注意到这个问题.我想做一些音乐推荐，现在我正在做的就是利用MPNowPlayingInfoCenter的nowPlayingInfo，就像这样:

Thanks for noticing this question. I want to do something about music recommendation, and what I am doing now is leveraging MPNowPlayingInfoCenter's nowPlayingInfo, like this:

NSDictionary *metaData = [[MPNowPlayingInfoCenter defaultCenter] nowPlayingInfo];
NSString *songTitle = metaData[MPMediaItemPropertyTitle];
NSString *albumnTitle = metaData[MPMediaItemPropertyAlbumTitle];
NSString *artist = metaData[MPMediaItemPropertyArtist];

但是，当音乐"应用在后台播放音乐时，它始终返回nil.我查了相关文件，上面写着

But it always returns nil when "Music" app is playing music in background. I looked up the related documents, it says

 MPNowPlayingInfoCenter provides an interface for setting the current now 
 playing information for the application.
 The default center holds now playing info about the current application

似乎没有办法通过MPNowPlayingInfoCenter获取其他应用程序的nowPlayingInfo.那么，还有其他方法可以让其他应用的音乐元数据显示在远程控制/锁定屏幕上吗?谢谢！

Seems there is no way to get other app's nowPlayingInfo through MPNowPlayingInfoCenter. So are there any other ways to get other app's music meta data displayed in remote control/lock screen? Thanks!

推荐答案

您可以获得iPod当前正在播放的内容

You can get what iPod currently is playing

MPMusicPlayerController* player = [MPMusicPlayerController iPodMusicPlayer];
//get now playing item
MPMediaItem*item = [player nowPlayingItem];
// get the title of song
NSString* titleStr = [item valueForProperty:MPMediaItemPropertyTitle];
NSLog(@"titlestr %@",titleStr);

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