Refresh and set new item AVPlayer class - xcode

Question

I'm trying to refresh NSView in which video finishes playing. I'd like to after I click button next or previous refresh view in which video is played. Actually I see new view overlapping old vindow. I've tried to do this using removeFromSuperView but it removes NSVindow. How to solve this?
MY CODE:
#interface AppDelegate ()
{
AVPlayer *player;
}
#property (weak) IBOutlet NSWindow *window;
#end
#implementation AppDelegate
#synthesize playerView;
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
NSURL *url = [[NSBundle mainBundle] URLForResource:#"pieniadz" withExtension:#"3gp"];
player = [AVPlayer playerWithURL:url];
AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];
[self.playerView.layer addSublayer:playerLayer];
playerLayer.frame = self.playerView.layer.bounds;
playerLayer.autoresizingMask = kCALayerWidthSizable | kCALayerHeightSizable;
player.actionAtItemEnd = AVPlayerActionAtItemEndNone;
// [player play];
// Insert code here to initialize your application
}
- (void)applicationWillTerminate:(NSNotification *)aNotification {
// Insert code here to tear down your application
}
- (IBAction)play:(id)sender {
[player play];
}
- (IBAction)stop:(id)sender {
[player pause];
}
- (IBAction)previous:(id)sender {
[player pause];
[self.playerView removeFromSuperview];
NSURL *url = [[NSBundle mainBundle] URLForResource:#"pieniadz" withExtension:#"3gp"];
player = [AVPlayer playerWithURL:url];
[self.playerView.layer removeAllAnimations];
//[self.playerView setNeedsDisplay:YES];
//[self.playerView.layer removeAllAnimations];
AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];
[self.playerView.layer addSublayer:playerLayer];
// [self.playerView.layer setNeedsDisplay];
playerLayer.frame = self.playerView.layer.bounds;
playerLayer.autoresizingMask = kCALayerWidthSizable | kCALayerHeightSizable;
player.actionAtItemEnd = AVPlayerActionAtItemEndNone;
}
- (IBAction)next:(id)sender {
[player pause];
NSURL *url = [[NSBundle mainBundle] URLForResource:#"Fatality" withExtension:#"mp4"];
[self.playerView setSubviews:[NSArray array]];
player = [AVPlayer playerWithURL:url];
//[self.playerView setNeedsDisplay:YES];
[self.playerView.layer removeAllAnimations];
AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];
[self.playerView.layer addSublayer:playerLayer];
// [self.playerView.layer setNeedsDisplay];
playerLayer.frame = self.playerView.layer.bounds;
playerLayer.autoresizingMask = kCALayerWidthSizable | kCALayerHeightSizable;
player.actionAtItemEnd = AVPlayerActionAtItemEndNone;
}
#end

Answer 1

When you first create your playerLayer, save it in a mvar (member variable). Let us suppose it is called _myPlayerLayer. In your next: and previous: methods, do this:
[_myPlayer removeFromSuperLayer];
and then create a new instance of a Player layer, assign it to _myPlayer, and add it as a sublayer of the view's layer as you did before.
Notice that this code will not affect the view at all.
I don't know why you are calling setSubviews: - that line looks wrong.