title: storyboards, InterfaceBuilders, 3.5 Vs 4 inch screen
body: <p>I am working on a UI that will live on different sizes of iPhone retina ( 3.5 and 4). 
  I am using storyboards, now in every viewcontroller I add in Interface builder, I can select the size under simulated metrics, and one option says retina iphone 3.5 screen. which is what I chose.
  I then setup constraints for the view controller to maintain top and bottom space to superview. Thinking that with this setup it will work fine on iPhone 3.5, and then resize properly to iphone 4 inch screen. </p>
  
  <p>its not working, do I have to resort to code and do this in viewdidload?</p>