Flutter how to execute when clicking back button

Question

I have a page that is called from bottom tab nav which executes a initState function, I then navigate to a page via button click that has details and actions to take, however when I click the back button to goto originating page, the initState does not run again, I have found out that because Flutter does not destroy the page when you put one on top, since the NAV is not on new page as its not in the menu, how do I make initState run again on clicking back button or is there another way to listen for that navigate from back button and run the code that needs to update data?

Any help would be great.

Answer 1

You can listen to the pop with WillPopScope (Creates a widget that registers a callback to veto attempts by the user to dismiss the enclosing [ModalRoute]. -> from documentation):

@override
Widget build(BuildContext context) {
 return WillPopScope(
  onWillPop: () {
    print('Backbutton pressed (device or appbar button), do whatever you want.');

    //trigger leaving and use own data
    Navigator.pop(context, false);

    //we need to return a future
    return Future.value(false);
  },
  child: Scaffold(
  ...
  ),
 );
}

Hopefully I got your question right and that helps :)!