title: how to change color of IconButton after pressed in flutter
body: <p>I want to change color of icon after pressing. how can I do it?
  My <code>IconButton</code> is leading of a <code>ListTile</code>.</p>
  
  <pre><code>leading: new IconButton(
    icon: Icon(Icons.star, color: Colors.white),
    onPressed: () {
      setState(() {
        //color: Colors.yellow; //How?
  
      });
    },
  ),
  </code></pre>