CODEWITHSUNDEEP
flutterdart
Mark
Mark

Reputation: 3849

How can I execute a function when a user hits the back button or swipes to close a screen in flutter?

I want to always execute a function when a screen is closed, either when a user presses the back button or does a swipe to close the page.

What I have tried is to use WillPopScope

return WillPopScope(
      onWillPop: _onWillPop,
      child: CupertinoScaffold( ... the rest of my tree

  Future<bool> _onWillPop() async {
    myFunction();
    return true;
  }

While this does successfully execute my function whenever the page is closed via the back button, it seems to have disabled being able to swipe to go back on iOS. Swipe to go back on android still seems to function.

Is there another way of doing this so I can retain the swipe to go back functionality on iOS?

edit:

Just incase it matters, myFunction() involves a provider and context and throws an error when I try to call it from dispose. In actuality myFunction() is:

context.read(myVisibilityProvider).changeVisibility(false);

Upvotes: 1

Views: 2653

Answers (1)

Watery Desert
Watery Desert

Reputation: 414

I successfully managed to run a function calling it from dispose retaining the iOS swipe to back gesture.

class ScrondScreen extends StatefulWidget {
  const ScrondScreen({Key? key}) : super(key: key);

  @override
  _ScrondScreenState createState() => _ScrondScreenState();
}

class _ScrondScreenState extends State<ScrondScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
    );
  }

  void myFunction() {
    print('I run');
  }

  @override
  void dispose() {
    myFunction();
    super.dispose();
  }
}

console: flutter: I run

Upvotes: 3

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