title: How to dynamically populate Tab Bar controller's tab bars.? (in swift -- iOS 9)
body: <p>I am developing an iOS application where the entry point is a login Screen.
  Which then after the login, segue to a tab bar controller.
  Now I want to dynamically populate the number and contents of the tab bar items based on which level the user has been logged in.</p>
  
  <p>Eg -></p>
  
  <p>Level 1 Login - Tab Bar Items </p>
  
  <ul>
  <li>Option A</li>
  <li>Option B</li>
  <li>Option C</li>
  <li>Option D</li>
  </ul>
  
  <p>Level 2 Login - Tab Bar Items</p>
  
  <ul>
  <li>Option C</li>
  <li>Option D</li>
  </ul>
  
  <p>How can I dynamically bind a tab bar controller to some data, to create this kind od views.?</p>