title: How to know that tableView started scrolling
body: <p>I have a doubt: is there any way to intercept a <code>tableView</code> scrolling to add it an action? For example my <code>prototype cell</code> background is red, touching up inside a cell its background color begin blue and scrolling the <code>tableView</code> background color return red.
  Is it possible to do this?!</p>
  
  <p>Thanks in advance.</p>