title: popViewController doesn't work in UITableViewController
body: <p>I have a UITableViewController embedded in a UINavigationController. Calling self.navigationController popViewControllerAnimated:YES in didSelectRowAtIndexPath method has no effect.</p>
  
  <p>My Main.storyboard looks like: UIViewController -> UINavigationController -> UITableViewController. How can I go back to UIViewController tapping on a UITableViewCell ?</p>