Is there a method for not using build context across async gaps?-CodePudding

I am trying to build a signOut feature on an ElevatedButton(). In the onPressed() method, I write an async function to signOut and navigate back to the first Screen of the App.

After writing this, I encountered a warning to not put BuildContexts in async gaps. I don't have a clue, what this means and what should be the better approach for this.

Here is the code snippet:

ElevatedButton(
                    onPressed: () async {
                      await AuthService().signOut();
                      Navigator.of(context)
                          .pushNamedAndRemoveUntil('/', (route) => false);
                    },
                    style: ElevatedButton.styleFrom(
                      backgroundColor: Colors.yellow,
                    ),
                    child: const Text('Sign Out'),
                  ),

Any approach to this query would be very helpful. Thank you.

CodePudding user response：

After the async call, you need to check if the widget is still mounted before you use a BuildContext. The reason for this that during the async call the widget could be removed from the tree and therefore the context which Navigator.of uses can be invalid:

onPressed: () async {
  await AuthService().signOut();
  if (mounted) {
    Navigator.of(context)
        .pushNamedAndRemoveUntil('/', (route) => false);
  }
}

This should remove the warning.