title: Swift - UINavigationController bar color does not change programmatically
body: <p>I have a problem with changing the background color of my <code>UINavigationBar</code>. 
  Here's what I tried so far:</p>
  
  <pre><code>    self.navigationController?.navigationBar.translucent = true
      self.navigationController?.navigationBar.backgroundColor = UIColor.blueColor()
  </code></pre>
  
  <p>The navigation bar does not change. Even setting the translucency to true has no effect at all.
  I can change the tint color without any problems, but not the background color.</p>
  
  <p>But if I change the color in the storyboard, it works fine!</p>
  
  <p>Is there an option in the storyboard that I enabled/disabled by mistake? Can someone help me with this? Thanks.</p>