Flutter: Access data from InheritedWidgets without context?

Jus10 picture Jus10 · Apr 22, 2018 · Viewed 7.5k times · Source

I see that I can access InheritedWidgets inside the build() method like this: final inheritedWidget = ChronoApp.of(context); but what if I want to access it somewhere else, say in initState() which has no context. How would I do this?

Answer

Sebastian picture Sebastian · Jul 29, 2018

What I found to work for me is getting the parent context and using it in the didChangeDependencies() function that is called after initState. Like this

@override
  // TODO: implement context
  BuildContext get context => super.context;

@override
  void didChangeDependencies() {
    bloc = LoginBlocProvider.of(context);
    bloc.isAuthenticated.listen((bool value) {
      setState(() {
        isLoading = false;
      });

      if (value) {
        Navigator.push(context, MaterialPageRoute(
          builder: (BuildContext context) => HomeScreen()
        ));
      }
    });
    super.didChangeDependencies();
  }

From de didChangeDependencies() docs:

This method is also called immediately after initState. It is safe to call BuildContext.inheritFromWidgetOfExactType from this method.

I'm still trying to fully understand this feature but this is what worked for me