title: Open UISplitViewController to Master View rather than Detail
body: <p>I have a split-view interface with a target iPhone 6 application. On the first launch of the application, it opens to the Detail View; I would like it to open to the Master View. I have tried:</p>
  
  <pre><code>self.splitViewController?.preferredDisplayMode = UISplitViewControllerDisplayMode.PrimaryOverlay
  </code></pre>
  
  <p>Which was suggested elsewhere <a href="https://stackoverflow.com/questions/27849654/uisplitviewcontroller-display-master-view-above-detail-in-portrait-orientation">(Prior StackOverFlow Question)</a> but it doesn't seem to do anything, and does not open the Master view on launch.  I also tried to add the following line to my AppDelegate:</p>
  
  <pre><code>splitViewController:collapseSecondaryViewController:ontoPrimaryViewController:
  </code></pre>
  
  <p>But despite returning true or false (<a href="https://stackoverflow.com/questions/25875618/uisplitviewcontroller-in-portrait-on-iphone-shows-detail-vc-instead-of-master">Another Prior Stack Overflow Question</a>) I had no success.</p>
  
  <p>I did launch up the example Master-Detail application in Xcode, and it loads to the Master view based on the splitViewController: call returning false; however, I'm not sure how to make this work in a more complicated layout. </p>