title: UIViewController Title attribute in Storyboard
body: <p>I am setting the title field of a <code>UIViewController</code> via <em>Interface Builder/Storyboard</em>: 
  <img src="https://i.stack.imgur.com/MObU5.png" alt="enter image description here"></p>
  
  <p>This view controller is nested in a <code>UINavigationController</code> which in turn is nested within a <code>UITabBarController</code>. When I run the app, I my navigation item has no title, neither does the tab bar item. </p>
  
  <p>If I explicitly set the view controller's navigation item's title, and also it's tab bar item's title in interface builder, then it works just fine.</p>
  
  <p>I am wondering:</p>
  
  <p>a)If I am not using <em>Storyboard</em> but just regular <em>xibs</em>, setting the title of a view controller implicitly sets the navigation items' title as well as the tab bar item's title. But it's not the same <em>storyboard</em>. Is this the intended behaviour?</p>
  
  <p>b) What is then the purpose of the view controller's title (in <em>Storyboard</em>)? it seems to have no effect.</p>
  
  <p>Thanks!</p>