title: Xcode 6 Interface Builder how do I make a UIView 100% width?
body: <p>Really basic question here I'm going through the docs and Apple videos but are yet to find out how to do it.</p>
  
  <p>In Xcode 6 / iOS7/8 I have a UIview that I have dragged on an existing View sitting inside a new default ViewController.</p>
  
  <p>All I want to do is in "Interface Builder" make this UIView I have dragged onto the screen "fill to 100% of the layout width", much like one would do with a webpage 100% width div wrapper, so that it automatically resizes its width on each device/layout it goes to.</p>
  
  <p>What settings do I need to change to do that???, I don't seem to be able to figure it out. </p>
  
  <p>I have been experimenting with constraints and size classes etc.</p>
  
  <p>Any help would be great</p>