You can't use interface builder for SpriteKit games can you?

Okay that makes sense. I guess my question is how do I go about doing that? Do I need to change the code handling the placement of the UI elements using fractions of the screen width and height instead of fixed whole numbers? Or do I add a line to the GameViewController that looks for which type of device is being used and then throws to a different set of files with values specific to that device?