title: Color of UIToolbar not changing
body: <p>I have created a UIToolbar. I am trying to give it black color using: </p>
  
  <pre><code>toolbar.barStyle = UIBarStyleBlackOpaque;
  </code></pre>
  
  <p>or</p>
  
  <p>toolbar's <code>background</code> property. But its color does not change in either case.</p>
  
  <p>How can I change it?</p>