title: How can set a ViewController to have Extend Edges Under Top Bar programmatically?
body: <p>In Storyboard I have option to put viewController content under top bar! How can I do that programmatically?</p>
  
  <p>What I want(I think) is <code>self.edgesForExtendedLayout = UIRectEdge.Top</code> but doesn't work...</p>