Question 78410 in Flutter Question posted in
The official Flutter documentation can be found here.

Why does BuildContext have no mounted property? – Flutter

I am trying to access to ‘mounted’ property, as specified in the Flutter docs.

With the following code…

      if (context.mounted) {

      }

I get the following error…

The getter ‘mounted’ isn’t defined for the type ‘BuildContext’.
Try importing the library that defines ‘mounted’, correcting the name to the name of an existing getter, or defining a getter or field named ‘mounted’.

I am on the latest flutter version avaible by running ‘upgrade’…

Flutter 3.3.10 • channel stable •
https://github.com/flutter/flutter.git Framework • revision 135454af32
(2 weeks ago) • 2022-12-15 07:36:55 -0800 Engine • revision 3316dd8728
Tools • Dart 2.18.6 • DevTools 2.15.0

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3

Answers


  1. 0

    the mounted bool is an independent variable of the State, it’s not a member on the BuildContext, so instead use:

      if (mounted) {

  }
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  2. 0

    BuildContext will soon have a mounted property:
    https://github.com/flutter/flutter/pull/111619

    context.mounted

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  3. 0

    This was added in flutter 3.7.0. Running flutter upgrade worked for me as I was somehow still on flutter 3.3.x.

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