title: Double tap on UITabBarItem doesn't scroll UITableView to top
body: <p>I have UITabBarController which each item has NavigationController and each NavigationController has a TableViewController as root view controller.</p>
  
  <p>The problem is tapping on each tab bar item doesn't make table view to scroll to top.</p>
  
  <p>What could be problem and how can I solve it?</p>