ios 音乐后台播放

 NSString *musicPath = [[NSBundle mainBundle] pathForResource:@"净土"

                                                          ofType:@"mp3"];

    if (musicPath) 

    {

        NSURL *musicURL = [NSURL fileURLWithPath:musicPath];

        [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];

        audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:musicURL  error:nil];

        [audioPlayer setDelegate:self];

    }