title: iOS can't set alpha value of toolbar color since 7.1
body: <p>I have a wired issue after upgrading xcode to include iOS7.1.
  The background color of the toolbar appears very bright in simulator and changing the alpha-value doesn't have any effect to it. The red color used to be a light red.</p>
  
  <p><img src="https://i.stack.imgur.com/oIT8a.png" alt="enter image description here"></p>
  
  <p>I set the color in <code>viewDidLoad</code>:</p>
  
  <pre><code>[self.navigationController setToolbarHidden:NO]; //animated:YES
  [self.navigationController.toolbar setBarTintColor:[UIColor colorWithRed:0.8f green:0.0f blue:0.0f alpha:0.5]];
  [self.navigationController.toolbar setTranslucent:YES];
  </code></pre>
  
  <p>Any ideas?</p>