Don't use 'BuildContext's across async gaps - where does the mounted property come from?

Question

How to rewrite this to awoid Don't use 'BuildContext's across async gaps. warning.

onPressed: () async {
  if (snapshot.hasData) {
    final isRapportExist = await bloc.isRapportExist();

    if (isRapportExist) {
      return;
    }

    bloc.submitRapport();
    Navigator.pop(context, true); //Don't use 'BuildContext's across async gaps.
  }
},

In such cases usully mounted property used, but where it comes from?

if(!mounted) return; //Undefined name 'mounted'.
Navigator.pop(context, true);

Does this answer your question? [how to solve BuildContexts across async gaps error flutter](https://stackoverflow.com/questions/73527600/how-to-solve-buildcontexts-across-async-gaps-error-flutter) — Robert Sandberg, Apr 18 '23 at 09:57
mounted is in State, or if you're in newer flutter, also in BuildContext. — Randal Schwartz, Apr 18 '23 at 18:02

score 1 · Answer 1 · answered Apr 18 '23 at 09:39

1

You can access it from context (BuildContext).

if(!context.mounted) return;

answered Apr 18 '23 at 09:39

Md. Yeasin Sheikh

54,221
7
29
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this line also produces that warning – rozerro Apr 18 '23 at 09:40
well kinda strange, how about `if(context.mounted){Navigator....}` – Md. Yeasin Sheikh Apr 18 '23 at 09:42
i think [`context.mounted`](https://api.flutter.dev/flutter/widgets/BuildContext/mounted.html) came on v3.7 – Md. Yeasin Sheikh Apr 18 '23 at 10:07
1

It happened when I referenced context outside the widget class when I passed context as a parameter. Now context.mounted accessible even in stateless widget. – rozerro Apr 19 '23 at 06:55

score 0 · Accepted Answer · answered Apr 18 '23 at 09:36

0

It's a property of the State class - which your State extends.

https://api.flutter.dev/flutter/widgets/State-class.html

answered Apr 18 '23 at 09:36

Andrija

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10

Don't use 'BuildContext's across async gaps - where does the mounted property come from?

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