SpriteKit Coordinates differ between iPad and iPhone

Question

I have a very simple SpriteKit scene that is not behaving like I would expect. It is a universal app and the code that I am using to draw a single red square in the scene is as

Answer 1

This is caused because the size of the screen on iPhone is incorrect - have a look in the scene's sks file, you should see the size of the scene is set to (1024, 768) by default. To correct this you need to set the scene size and scale mode:

scene.size = skView.bounds.size
scene.scaleMode = .AspectFill

You should do this is didMoveToView or when you instantiate the scene.