Flutter：从没有上下文的InheritedWidgets访问数据？

Question

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 1

According to this docs context should be available in initState using the context getter.

https://docs.flutter.io/flutter/widgets/State/context.html

The framework associates State objects with a BuildContext after creating them with StatefulWidget.createState and before calling initState.

Answer 2

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