title: UINavigationBar. Apperance. setBarTintColor doesn't work
body: <p>When I call</p>
  
  <pre><code>[[UINavigationBar appearance] setBarTintColor:[UIColor greenColor]];
  </code></pre>
  
  <p>in</p>
  
  <p>didFinishLaunchingWithOptions</p>
  
  <p>All works fine, but the following code gives white color:</p>
  
  <pre><code>[[UINavigationBar appearance] setBarTintColor:[UIColor colorWithRed:21.0 green:194.0 blue:179.0 alpha:0.5]];
  </code></pre>
  
  <p>I can't understand why. NavBar translucent is enabled.</p>