title: UINavigationController swipe to go back issue
body: <p>I am creating NavigationController app which contains login and other pages. I am hiding navigation controller in login page and displaying in other pages. I have back/logout button on the left side of the second screen. when i try to drag from second screen (i am not full swipe to the login screen), navigation bar in second screen becomes hidden. It never appears again on other pages. I need to go back to login and push to second view to make navigation bar to show. When i click back/logout button instead of swipe, it works.</p>
  
  <p>Any idea on solving this issue</p>