Swift 锁屏界面操控播放的音乐

        // 锁屏进度控制
        let center = MPRemoteCommandCenter.shared()
        
        // 修改进度
        center.changePlaybackPositionCommand.addTarget { event in
            
            guard let event = event as? MPChangePlaybackPositionCommandEvent else {
                return .commandFailed
            }
            
            aVplayer.seek(to: CMTime(seconds: event.positionTime, preferredTimescale: 1),
                               toleranceBefore: CMTime(seconds: 0, preferredTimescale: 1),
                         toleranceAfter: CMTime(seconds: 0, preferredTimescale: 1))
            
            // 更新锁屏信息
            return .success
        }
        
        // 播放
        center.playCommand.addTarget { event in
            
            self.continuePlayMusicAction()    
            return .success
        }
        
        // 暂停
        center.pauseCommand.addTarget { event in
            
            self.pauseMusicAction()
            return .success
        }
        
        // 下一首
        center.nextTrackCommand.addTarget { event in
            
            self.playerEndAction()
            return .success
        }
        
        // 上一首
        center.previousTrackCommand.addTarget { event in
            
            self.playerPreviousAction()
            return .success
        }

    // MARK: 更新锁屏界面的播放信息
    @objc private func updateScreenInfoAction(model: MusicProjectPlayInfoModel, to: Double = 0.0) {
        
        
        var dic = [String:Any]()
        dic[MPMediaItemPropertyTitle] = model.name
        dic[MPNowPlayingInfoPropertyElapsedPlaybackTime] = to
        dic[MPNowPlayingInfoPropertyPlaybackRate] = model.player.rate
        
        // 获取时长。item.duration.seconds 不凑效
        if model.url != nil {
            let asset = AVURLAsset.init(url: model.url!)
            dic[MPMediaItemPropertyPlaybackDuration] = CMTimeGetSeconds(asset.duration)
        }
        
        MPNowPlayingInfoCenter.default().nowPlayingInfo = dic

    }