title: Custom color and alpha in tab bar
body: <p>i'm trying to change the color of a tabbar in my app, i use this line of code to change the color of it:</p>
  
  <pre><code>[[UITabBar appearance] setBarTintColor:[UIColor greenColor]];
  </code></pre>
  
  <p>I want to add a translucent iOS 7 effect but with a green color. I've changed translucent property but i don't see any result.</p>