title: Create UIViewController xib file for my existing ViewController file in Xcode 8
body: <p>I have an existing View Controller file with a set of code. I want to create an interface builder file for the ViewController and link them. Right now i don't seem to find UIViewController option in the New file options as give here.
  <a href="https://i.stack.imgur.com/Xrf0U.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Xrf0U.png" alt="enter image description here"></a></p>
  
  <p>Can any body tell me how to achieve this?</p>