I’ve a world key assigned to the highest stage scaffold in my app:
ultimate GlobalKey<ScaffoldState> globalScaffoldKey = GlobalKey();
I assign it like this:
MaterialApp.router(
debugShowCheckedModeBanner: false,
routerConfig: appRouter,
builder: (context, youngster) {
return Container(
youngster: Scaffold(
key: globalScaffoldKey,
physique: ...
),
),
);
},
Then in one of many screens under the fabric app, I’ve this code:
doSomeAsyncWork(
onSuccess: () {
showSuccessSnackBar(
context: globalScaffoldKey.currentContext!,
textual content: AppLocalizations.of(context)!
.profileUpdatedSuccessfully,
);
if(!mounted) return;
GoRouter.of(context).pop();
},
);
If I’m going again from that display screen earlier than the onSuccess has been known as (it’s known as from inside doAsyncWork), then when its known as, I get this error: This widget has been unmounted, so the State now not has a context (and ought to be thought-about defunct
I do know it implies that the globalScaffoldKey.currentContext! is being thought-about not mounted, however my query is why? That scaffold is above each the display screen I used to be in and the display screen I navigated to.
word: – showSuccessSnackBar simply calls the built-in ScaffoldMessenger.of(context).showSnackBar:
ScaffoldMessenger.of(context).clearSnackBars();
return ScaffoldMessenger.of(context).showSnackBar(
...
I even tried calling the showSnackBar methodology from the get rid of this display screen after 2 seconds:
@override
void dispose() {
...
Future.delayed(
Length(seconds: 2),
() {
print('after 2 seconds of disposing profile display screen');
print('is display screen mounted: $mounted');
print('is world scaffold key mounted: ${globalScaffoldKey.currentContext!.mounted}');
return showSuccessSnackBar(
context: globalScaffoldKey.currentContext!,
textual content: AppLocalizations.of(context)!.profileUpdatedSuccessfully,
);
},
);
I obtained this output (and the identical error)
flutter: is display screen mounted: false
flutter: is world scaffold key mounted: true
