title: UITableView last cell hidden by UITabBarController
body: <p>I am facing a strange issue. </p>
  
  <p>I have a <code>UITableView</code> in the initial <code>UIViewController</code> of the <code>UITabBarController</code>. At first everything is alright, but when I change the tab and come back to first tab the last cell of <code>UITableView</code> is hidden by the tabbar.</p>
  
  <p>How can I fix this?</p>