title: How can I click the tab bar to pop up a modal xcode
body: <p>I want to click tab bar to pop up a modal view not just view controller.</p>
  
  <p>(Like Instagram's camera tab bar to pup up camera view)</p>
  
  <p>However when I drag from navigation controller to another view controller</p>
  
  <p><img src="https://i.stack.imgur.com/f7fTi.png" alt="i drag from navigation controller to view controller"></p>
  
  <p>I always got a black view when I run the app if I choose present modally.</p>
  
  <p>So now, I can only choose root view controller.</p>
  
  <p>Sorry for my poor English !</p>
  
  <p>Can anyone understand and help me ?   </p>