title: Swift passing data between Nav and Tab Controller
body: <p>A viewcontrollerB is the root view of nav controller and first view of tab view controller at same time. How to pass a data from initial viewA through nav and tab controller to ViewB ? Thanks</p>
  
  <p><a href="http://i.stack.imgur.com/qZD4K.png" rel="nofollow">Storyboard</a></p>