title: How to animate tab bar's items
body: <p>In my Swift app I have this class that handles a <code>UITabBar</code>.</p>
  
  <pre><code>class CustomTabBar: UITabBar {
      override func awakeFromNib() {
          super.awakeFromNib()
      }
  }
  </code></pre>
  
  <p>How can I animate the items when the user tap their?
  I mean a <code>CGAffine(scaleX: 1.1, y: 1.1)</code>
  So how I can animate the tab bar's items?</p>