return YES;
}添加以下代码：

 // 设置接受远程控制[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

#import <AVFoundation/AVFoundation.h>
#import <MediaPlayer/MediaPlayer.h>

在ViewController.m文件添加方法：

#pragma mark - 锁屏界面开启和监控远程控制事件
//锁屏界面开启和监控远程控制事件
- (void)createRemoteCommandCenter{// 远程控制命令中心 iOS 7.1 之后  详情看官方文档：https://developer.apple.com/documentation/mediaplayer/mpremotecommandcenterMPRemoteCommandCenter *commandCenter = [MPRemoteCommandCenter sharedCommandCenter];// MPFeedbackCommand对象反映了当前App所播放的反馈状态. MPRemoteCommandCenter对象提供feedback对象用于对媒体文件进行喜欢, 不喜欢, 标记的操作. 效果类似于网易云音乐锁屏时的效果//添加喜欢按钮MPFeedbackCommand *likeCommand = commandCenter.likeCommand;likeCommand.enabled = YES;likeCommand.localizedTitle = @"喜欢";[likeCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {NSLog(@"喜欢");return MPRemoteCommandHandlerStatusSuccess;}];//添加不喜欢按钮，这里用作“下一首”MPFeedbackCommand *dislikeCommand = commandCenter.dislikeCommand;dislikeCommand.enabled = YES;dislikeCommand.localizedTitle = @"下一首";[dislikeCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {NSLog(@"下一首");[self nextButtonAction:nil];return MPRemoteCommandHandlerStatusSuccess;}];//标记MPFeedbackCommand *bookmarkCommand = commandCenter.bookmarkCommand;bookmarkCommand.enabled = YES;bookmarkCommand.localizedTitle = @"标记";[bookmarkCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {NSLog(@"标记");return MPRemoteCommandHandlerStatusSuccess;}];// 远程控制播放[commandCenter.pauseCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {[musicPlayer.play pause];return MPRemoteCommandHandlerStatusSuccess;}];// 远程控制暂停[commandCenter.playCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {[musicPlayer.play play];return MPRemoteCommandHandlerStatusSuccess;}];// 远程控制上一曲[commandCenter.previousTrackCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {NSLog(@"上一曲");return MPRemoteCommandHandlerStatusSuccess;}];// 远程控制下一曲[commandCenter.nextTrackCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {NSLog(@"下一曲");[self nextButtonAction:nil];return MPRemoteCommandHandlerStatusSuccess;}];//快进MPSkipIntervalCommand *skipBackwardIntervalCommand = commandCenter.skipForwardCommand;skipBackwardIntervalCommand.preferredIntervals = @[@(54)];skipBackwardIntervalCommand.enabled = YES;[skipBackwardIntervalCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {NSLog(@"你按了快进按键！");// 歌曲总时间CMTime duration = musicPlayer.play.currentItem.asset.duration;Float64 completeTime = CMTimeGetSeconds(duration);// 快进10秒_songSlider.value = _songSlider.value + 10 / completeTime;// 计算快进后当前播放时间Float64 currentTime = (Float64)(_songSlider.value) * completeTime;// 播放器定位到对应的位置CMTime targetTime = CMTimeMake((int64_t)(currentTime), 1);[musicPlayer.play seekToTime:targetTime];return MPRemoteCommandHandlerStatusSuccess;}];//在控制台拖动进度条调节进度（仿QQ音乐的效果）[commandCenter.changePlaybackPositionCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {CMTime totlaTime = musicPlayer.play.currentItem.duration;MPChangePlaybackPositionCommandEvent * playbackPositionEvent = (MPChangePlaybackPositionCommandEvent *)event;[musicPlayer.play seekToTime:CMTimeMake(totlaTime.value*playbackPositionEvent.positionTime/CMTimeGetSeconds(totlaTime), totlaTime.timescale) completionHandler:^(BOOL finished) {}];return MPRemoteCommandHandlerStatusSuccess;}];}

[self createRemoteCommandCenter];

#pragma mark - 锁屏播放设置
//展示锁屏歌曲信息：图片、歌词、进度、演唱者
- (void)showLockScreenTotaltime:(float)totalTime andCurrentTime:(float)currentTime andLyricsPoster:(BOOL)isShow{NSMutableDictionary * songDict = [[NSMutableDictionary alloc] init];//设置歌曲题目[songDict setObject:songInfo.title forKey:MPMediaItemPropertyTitle];//设置歌手名[songDict setObject:songInfo.author forKey:MPMediaItemPropertyArtist];//设置专辑名[songDict setObject:songInfo.album_title forKey:MPMediaItemPropertyAlbumTitle];//设置歌曲时长[songDict setObject:[NSNumber numberWithDouble:totalTime]  forKey:MPMediaItemPropertyPlaybackDuration];//设置已经播放时长[songDict setObject:[NSNumber numberWithDouble:currentTime] forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];UIImage * lrcImage = songInfo.pic_big;if (isShow) {//制作带歌词的海报if (!_lrcImageView) {_lrcImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 480,800)];}//主要为了把歌词绘制到图片上，已达到更新歌词的目的[_lrcImageView addSubview:_deliverView.midView.midLrcView.lockScreenTableView];_lrcImageView.image = lrcImage;_lrcImageView.backgroundColor = [UIColor blackColor];//获取添加了歌词数据的海报图片UIGraphicsBeginImageContextWithOptions(_lrcImageView.frame.size, NO, 0.0);CGContextRef context = UIGraphicsGetCurrentContext();[_lrcImageView.layer renderInContext:context];lrcImage = UIGraphicsGetImageFromCurrentImageContext();_lastImage = lrcImage;UIGraphicsEndImageContext();}else{if (_lastImage) {lrcImage = _lastImage;}}//设置显示的海报图片[songDict setObject:[[MPMediaItemArtwork alloc] initWithImage:lrcImage]forKey:MPMediaItemPropertyArtwork];[[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:songDict];}

在更新播放进度的方法中调用：

//展示锁屏歌曲信息，上面监听屏幕锁屏和点亮状态的目的是为了提高效率
[self showLockScreenTotaltime:totalTime andCurrentTime:currentTime andLyricsPoster:isShowLyricsPoster];

锁屏歌词实现原理是将锁屏歌词tableView加到锁屏专辑图片imageView中，合成新图片，歌词滚动的时候刷新tableView，然后就可以实现锁屏歌词滚动了。