title: How to set constraints based on screen size in Xcode using Swift?
body: <p>I want to be able to have my constraints, <code>UIImages</code>, and <code>UIButtons</code> to be proportionate to all screen. How do I do that? Like on the iPad, lets say its 137p x 60p and lets say the iPhone's width is 150% smaller and the height is lets say is 125% smaller. I want it to scale the position and size by 150% down/horizontal and 125% side/vertical
  (I know its actually not those sizes but hypothetically.)</p>