ios - Next Previous buttons with AVPlayerViewController and AVQueuePlayer not working -

i'm using avplayerviewcontroller play number of videos, via avqueueplayer. problem previous/next buttons don't seem anything. can't find way of being notified when buttons touched. missing something?

the code i'm using pretty simple:

self.player = avqueueplayer(items: playeritems) self.playerviewcontroller = avplayerviewcontroller() self.playerviewcontroller?.player = self.player self.presentviewcontroller(self.playerviewcontroller!, animated: false, completion: { () -> void in     self.playerviewcontroller?.player.play() })