title: I renamed ViewController.swift and now nothing appears in the Assistant editor in Xcode 11
body: <p>I renamed ViewController.swift to PickViewController.swift and now it doesn't appear in the Assistant editor. </p>
  
  <p>I guess this is because PickViewController.swift is no longer related to the image in Main.storyboard. </p>
  
  <p>Any idea how to fix this?</p>