title: change color of `UITableViewCell` once shown in screen
body: <p>I want to change the color of the <code>UITableViewCell</code> once it is shown on the screen to reflect something like the read/unread behaviour. For example:</p>
  
  <p>User will be seeing a list which will be firstly of lets say red color then after some time the color should be changed to clearColor. When user scrolls down the new cell should again be red for a limited time and then change to clearColor.</p>