Ios 如何使用带音频播放器的锁屏按钮？

我使用此代码显示有关曲目的信息，并使用播放/暂停按钮

-(void)info
{
UIImage *image = [UIImage imageNamed:@"image.png"];

NSInteger highScore = [[[NSUserDefaults standardUserDefaults] objectForKey:@"int"] intValue];

MPMediaItemArtwork *albumArtwork = [[MPMediaItemArtwork alloc] initWithImage:image];

MPNowPlayingInfoCenter* mpic = [MPNowPlayingInfoCenter defaultCenter];
mpic.nowPlayingInfo = @{MPMediaItemPropertyArtist: @"1",
                        MPMediaItemPropertyTitle:[NSString stringWithFormat:@"1 %ld",(long)highScore],
                        MPMediaItemPropertyArtwork:albumArtwork,
                        MPMediaItemPropertyAlbumTitle: @"1",
                        MPNowPlayingInfoPropertyElapsedPlaybackTime:[NSNumber numberWithFloat: [self.audioPlayer getCurrentAudioTime]],
                        MPMediaItemPropertyPlaybackDuration : [NSNumber numberWithFloat:[self.audioPlayer getAudioDuration]]};
}

- (void)remoteControlReceivedWithEvent:(UIEvent *)receivedEvent {

if (receivedEvent.type == UIEventTypeRemoteControl) {

    switch (receivedEvent.subtype) {

        case UIEventSubtypeRemoteControlPreviousTrack:
            NSLog(@"prev");
            break;

        case UIEventSubtypeRemoteControlNextTrack:
            NSLog(@"next");
            break;

        case UIEventSubtypeRemoteControlPlay:
            [_audioPlayer playAudio];
            break;

        case UIEventSubtypeRemoteControlPause:
            [_audioPlayer pauseAudio];
            break;

        default:
            break;
    }
}
}

我想在苹果音乐应用程序中使用倒带按钮（如下图）

如果我点击按钮audioPlayer，移动到下一个曲目。若我长按按钮，轨迹是倒带。怎么做？

将这两行添加到 “-（无效）viewDidLoad”

---

我有个问题。setDelegate已弃用。

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