title: UINavigationBar set tintcolor tested in iOS7 not working?
body: <p>I have an app which have a <code>UINavigationBar</code> and I have set the tint color to black like this:</p>
  
  <pre><code>self.navigationController.navigationBar.tintColor = [UIColor blackColor];`
  </code></pre>
  
  <p>I have tested it in IOS 6 and it's black. However, it appears as the default navigation bar when I tried the same app in iOS 7.</p>
  
  <p>As the title says, is it not working?</p>