title: UINavigationbar barTintColor not working in UISplitview Template
body: <p>I am trying for hours to change the Navigationbar barTintValue in my App.
  I am using the Master-Detail Template from Xcode using Swift and
  I read a lots of questions here, but the answer was always to use</p>
  
  <pre><code>navigationController?.navigationBar.barTintColor = UIColor.redColor()
  </code></pre>
  
  <p>This works fine in AppDelegate, but I want to change the color in each DetailView depending on its content at runtime.</p>
  
  <p>When i put this code into the Master or DetailViewController just nothing happens. I printed out the colors before and after and it does set the values, it just doesn't change.
  Do I need to update the view or something?</p>
  
  <p>Thanks for you help!
  Maik</p>