title: Make UIView subview as default UIView for UIViewController with Storyboard
body: <p>I have a multi-viewcontroller app. </p>
  
  <p>The main view of the main VC is subclassed so I can use Core Graphics animations. It's called "animations" class.</p>
  
  <p>On the storyboard, I add a UIView called "MainArea" as a subview of the "animations". I have a VC called "MainAreaVC". As you know it has a property of "view". How can I make the "MainArea" subview the default UIView of my "MainAreaVC"? </p>
  
  <p>The other option is to just make the "MainArea" view a property of my "MainAreaVC" and use this. I just don't want the "MainAreaVC"'s default "view" property just hanging out doing nothing. </p>