How to change SKScene position before presenting? - swift

Question

I am trying to adjust SKScene position based on the device the game is running. For example due to 'top notch' area of iPhone XS Max, I need to subtract that height from SKScene height and position the scene accordingly.
So here is how I calculate the height aka safeAreaHeight in the AppDelegate and subtract from scene height aka sceneHeight:
safeAreaHeight = UIApplication.shared.statusBarFrame.size.height
sceneHeight -= safeAreaHeight
In GameViewController I try to re-position the SKScene like below:
if let view = self.view as! SKView? {
// Load the SKScene from 'MainMenuScene.sks'
if let scene = SKScene(fileNamed: "MainMenuScene") {
// Set the scale mode to scale to fit the window
scene.scaleMode = .aspectFit
scene.size.height = sceneHeight
scene.size.width = sceneWidth
scene.position.y -= safeAreaHeight
// Present the scene
view.presentScene(scene)
}
view.ignoresSiblingOrder = true
view.showsFPS = true
view.showsNodeCount = true
}
However, I am getting below error:
SKScene: Setting the position of a SKScene has no effect.
Additionally, I tried to use SKAction to move position of the SKScene as well, then I received below error:
SKScene: Animating the position of a SKScene has no effect.
Thank you for the help.

Answer 1

Well I figured how to achieve this, I am sharing in case it would help someone else.
Inside AppDelegate you get the correct safe area values and store it in a singleton (in my case: safeAreaHeight) for access throughout the app. Subtract the amount from scene height (sceneHeight).
let kWindow = UIApplication.shared.windows[0]
safeAreaHeight = kWindow.safeAreaInsets.top + kWindow.safeAreaInsets.bottom
screenHeight = screenRect.size.height - safeAreaHeight
Don't forget the adjust the sceneHeight in GameViewController before presenting it:
if let view = self.view as! SKView? {
// Load the SKScene from 'MainMenuScene.sks'
if let scene = SKScene(fileNamed: "MainMenuScene") {
// Set the scale mode to scale to fit the window
scene.scaleMode = .aspectFit
scene.size.height = sceneHeight
scene.size.width = sceneWidth
// Present the scene
view.presentScene(scene)
}
view.ignoresSiblingOrder = true
view.showsFPS = true
view.showsNodeCount = true
}
Inside loaded scene, in this case it is MainMenuScene, you simply find subview of SKScene and adjust its Y position by subtracting the safeAreaHeight at its center
guard let subView = self.view else { return }
subView.center.y -= safeAreaHeight
PS.: Do not adjust all the views in different scenes (ie.: GameScene, GameOverScene etc.) Once you adjust, it remains throughout the app.