Loading a new SKScene into an existing SKView messes up the bounds - ios

Question

I am trying to remove a SKScene and add a new one. The first presentScene: works fine, but the second one has messed up bounds, like this.
Here is my code.
#implementation GameViewController
- (void)viewDidLoad
{
[super viewDidLoad];
[self loadLevel:1];
}
- (void)loadLevel:(int)level {
SKView * skView = (SKView *)self.view;
[skView presentScene:nil];
GameScene * gameScene;
switch (level) {
case 1:
gameScene = [Level1 sceneWithSize:skView.bounds.size];
break;
case 2:
gameScene = [Level2 sceneWithSize:skView.bounds.size];
break;
default:
break;
}
gameScene.scaleMode = SKSceneScaleModeAspectFill;
gameScene.gameViewController = self;
self.gameScene = gameScene;
[skView presentScene:gameScene transition:[SKTransition crossFadeWithDuration:1.0f]];
}

Answer 1

I didn't figure out why skView.bounds.size was changing between levels, but to correct it I hardcoded the size in. Let me know if there's a better way of doing it.
gameScene = [Level1 sceneWithSize:CGSizeMake(768, 1024)];

Answer 2

You run this in viewDidLoad, which means the view will be in portrait mode at that time:
- (void)viewDidLoad
{
[super viewDidLoad];
[self loadLevel:1];
}
To fix this, you should present the first scene in viewWillLayoutSubviews:
- (void)viewWillLayoutSubviews
{
[super viewWillLayoutSubviews];
if (((SKView*)self.view).scene == nil)
{
[self loadLevel:1];
}
}
It's important to add the nil check because viewWillLayoutSubviews will be called repeatedly, for instance when rotating the device.