Flutter：BLoC 包 - 块提供者

Question

I'm using this package: https://pub.dartlang.org/packages/bloc . I have 2 views: In the first one I display a list of elements using "bloc1" and, trough a FloatingActionButton, I can navigate to a second screen that uses "bloc2". In this second screen I want to add an element to my previous list trough a Bloc provider of "bloc1", so that I can do something like bloc1.dispatch(addElement) . My question is: how can I declare a bloc provider of bloc1? For example something like: Bloc bloc = BlocProvider.of<Bloc1>(context)

Answer 1

You would need to wrap your MaterialApp with BlocProvider like:

BlocProvider(bloc: bloc1, child: MaterialApp(...));

Then you can access bloc1 from anywhere using: BlocProvider.of<Bloc1>(context)

Hope that helps!

Answer 2

Bloc now supports MultiBlocProvider which helps you setup all your blocs once in the main and use it anywhere in your code.

In your main.dart

return MultiBlocProvider(
  providers: [
    BlocProvider<BlocA>(create: (BuildContext context) => BlocA(),),
    BlocProvider<BlocB>(create: (BuildContext context) => BlocB(),),
  ],
  child: MaterialApp(....),
)