title: Xcode - Is it possible to view Main.storyboard in the Interface Builder and its source code simultaneously?
body: <p>I can open either the Source Code or Interface Builder view of the Storyboard individually.</p>
  
  <p>I'd really like to open both side-by-side, as I found certain features maddeningly missing from the Interface Builder UI, like adding constraints between arbitrary attributes; e.g., the trailing side of a label to the view center.</p>
  
  <p>I can't get Xcode to do this via the Assistant editor. It seems like the most useful development Storyboard display, as then I could edit the code by hand when necessary and immediately see the result, or quickly look up data I need (such as the component IDs) for the source code.</p>