title: Multiple view controllers in a single scene?
body: <p>I've been a Mac programmer since 1993 and find it somewhat hard to get into the iOS frame of mind from time to time.</p>
  
  <p>I've got an iPhone app that was designed for the iPhone 5 screen size and shows 3 different views with different functionalities depending on the orientation of the device (portrait and 2xlandscape).</p>
  
  <p>Now on the iPad I want to separate the landscape screen into a left part controlled by one (existing) view controller and the right part by another (existing) view controller.</p>
  
  <p>As part of trying to support split screen multi-tasking I want to support size classes but my views are in xib files at the moment.. and as far as I know size classes are bound to using storyboards, so I'm migrating to storyboards which seem very ill-structured for my purposes.</p>
  
  <p>I can see that the idea is </p>
  
  <p><code>1 window = 1 root controller</code></p>
  
  <p>and </p>
  
  <p><code>1 screen full = 1 scene = 1 view controller</code>.</p>
  
  <p>But what I need is two (or 3) view controller in a single scene.</p>
  
  <p>I've had a look at UISplitView, which seems perfect only that the left view controller has to be a navigation controller, so not what I need. Perhaps a custom collection view controller is the answer?</p>
  
  <p>I'm sure I'm missing something as I'm very much stuck in a Mac mindset and haven't used storyboards before.. <strong>what's the best way of re-using my existing view controllers in this scenario?</strong></p>
  
  <p>Any advice would be very much appreciated.</p>