如何在控制中心制作持续时间滑块？迅速

func controlCenter() {
    let mpPlaysCenter = MPNowPlayingInfoCenter.defaultCenter()
    mpPlaysCenter.nowPlayingInfo = [MPMediaItemPropertyArtist: artistSongForLabel, MPMediaItemPropertyTitle: nameSongForLabel, MPMediaItemPropertyPlaybackDuration: player.duration, MPMediaItemPropertyPlayCount: player.currentTime]
}