title: Navigation bar blends with black instead of white when presenting a view controller modally
body: <p>I'm trying to present a view controller (which is embedded in a navigation controller) modally. The problem is that when the view is presented, it is blending the navigation bar with black rather than white.</p>
  
  <p>I am creating my view controller from a storyboard and showing it by using <code>-[UIViewController presentViewController:animated:completion:]</code>.</p>
  
  <p>How can I get the correct blending as can be seen below?</p>
  
  <h2>Incorrect behavior:</h2>
  
  <p><img src="https://i.stack.imgur.com/QGaul.png" alt="enter image description here"></p>
  
  <h2>Correct behavior:</h2>
  
  <p><img src="https://i.stack.imgur.com/Pr7d2.png" alt="enter image description here"></p>