The following text is from Showing a lock screen image using MPNowPlayingInfoCenter doesn't work
Never mind I figured out.
If anyone want to learn you have to do the following
let mpic = MPNowPlayingInfoCenter.defaultCenter()
// initialize an instance of MPMediaItemArtWork with a UIImage
var albumArtWork = MPMediaItemArtwork(image: songs[currentAudioIndex].songImage)
// Then assign it to the MPNowPlayingInfoCenter
mpic.nowPlayingInfo = [ MPMediaItemPropertyTitle:songs[currentAudioIndex].songName, MPMediaItemPropertyArtist:songs[currentAudioIndex].artistName, MPMediaItemPropertyArtwork:albumArtWork ]
