title: How to present view controller embedded in navigation controller modally?
body: <p>Say I have these view controllers:
  Navigation Controller -> vc1 -> vc2 -> vc3</p>
  
  <p>I want vc3 to show modally (appear form the bottom), so I selected the "Present Modally" option on the segue between vc2 and vc3. However, what happens is that my navigation bar on vc3 gets hidden, and also when I close vc3, it transitions weirdly--it pops back down (what you would expect from a modal view), and then also slides back left (as if a back button was pressed).</p>
  
  <p>So what is the right way to present modally? Do I need to put vc3 in it's navigation controller?</p>