title: How to call a function to update a value after popping a screen in Flutter?
body: <p>Screen 1: shows list of item with add button.
  Screen 2: form to add a new item to the list.</p>
  <p>Screen 2 &gt;&gt; Screen 1 - While calling navigator.pop() in screen 2, how to call method/setState (to update list) in screen 1?
  Can anyone help me out?</p>
  <p>I don't want to relaunch screen again. I just need to run a method to update my list after popping previous screen?</p>