选定的音乐未从 iPhone 音乐库中播放
我已经创建了一个 iPhone 应用程序。使用此应用程序，我可以录制我的声音并播放录制的文件。但如果我从库中选择一个音乐文件，它就不会播放。
// sample code that I have used in my application
self.player = [MPMusicPlayerController applicationMusicPlayer];
MPMediaPropertyPredicate *songNamePredicate = [MPMediaPropertyPredicate predicateWithValue: self.songName forProperty: MPMediaItemPropertyTitle];
MPMediaQuery *mySongQuery = [[MPMediaQuery alloc] init];
[mySongQuery addFilterPredicate: songNamePredicate];
[player setQueueWithQuery:mySongQuery];
[player play];
请帮我解决它。
I have created an iPhone application. Using this application, I can able to record my voice and able to play that recorded file. But if I select a music file from library, it is not playing.
// sample code that I have used in my application
self.player = [MPMusicPlayerController applicationMusicPlayer];
MPMediaPropertyPredicate *songNamePredicate = [MPMediaPropertyPredicate predicateWithValue: self.songName forProperty: MPMediaItemPropertyTitle];
MPMediaQuery *mySongQuery = [[MPMediaQuery alloc] init];
[mySongQuery addFilterPredicate: songNamePredicate];
[player setQueueWithQuery:mySongQuery];
[player play];
Please help me to resolve it.
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改成
也
查询结果的值是多少
Change
to
also what is the value of the query result