The method 'bloc' isn't defined for the type 'BuildContext'

Question

 Widget build(BuildContext context) {
    final appBar = AppBar(
      title: Text(
        "Romantic Comedy",
      ),
      actions: [
        IconButton(
          icon: Icon(Icons.search),
          onPressed: () {
            showSearch(
                context: context,
                delegate: MaterialSearch(_pagingController.itemList));
          },
        ),
      ],
    );

    return Scaffold(
        backgroundColor: Colors.black,
        appBar: appBar,
        body: BlocConsumer<MovieBloc, MovieState>(
            listener: (context, movieState) {

            },
            builder: (context, movieState) {
              if (movieState is MovieSuccessState) {
                movieBloc.movies.addAll(movieState.movies);
              }
              return GridView.builder(
                  controller: _scrollController
                    ..addListener(() {
                      if (_scrollController.offset ==
                          _scrollController.position.maxScrollExtent) {
                        context.bloc<MovieBloc>()
                          ..isFetching = true
                          ..add(Fetch());
                      }
                    }),
                  padding: EdgeInsets.only(left: 12.0, right: 12.0),
                  gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                      crossAxisCount: 3),
                  itemBuilder: (context, index) => MovieTile(_movies[index]));
            }));
  }

What version of `flutter_bloc` you are using? after `v6.1.0` both `context.bloc` and `context.repository` are deprecated in favor of `context.read` and `context.watch` checkout the [migration guide](https://bloclibrary.dev/#/migration?id=v610) — Adnan Alshami, Jul 07 '21 at 04:49
Ok @Adnan alshami you can give this as an answer and I'll mark it as the right answer. — Abraham Mathew, Jul 08 '21 at 05:11

score 31 · Accepted Answer · edited Dec 15 '22 at 14:20

31

After flutter_bloc v6.1.0,

Both context.bloc and context.repository are deprecated and replaced with context.read and context.watch.

Checkout the migration guide for more information.

edited Dec 15 '22 at 14:20

krishnaacharyaa

14,953
4
49
88

answered Jul 08 '21 at 16:31

Adnan Alshami

949
1
7
22

perfect solution for me , big thanks – Apps Maker Mar 23 '22 at 00:37

score 1 · Answer 2 · edited Nov 04 '21 at 10:05

I think that the below code that you used means that will use bloc from the parent widget defined with BlocProvider. But because it seems that you have a bloc instance in this widget you just use that instance.

// with extensions
context.bloc<BlocA>();

// without extensions
BlocProvider.of<BlocA>(context)

Because you used movieBloc at the MovieSuccessState state, I think you can just refer isFetching and add method using movieBloc instead of context.bloc<MovieBloc>().

return GridView.builder(
                  controller: _scrollController
                    ..addListener(() {
                      if (_scrollController.offset ==
                          _scrollController.position.maxScrollExtent) {
                        //context.bloc<MovieBloc>()
                        //  ..isFetching = true
                        //  ..add(Fetch());
                        movieBloc.isFetching = true;
                        movieBloc.add(Fetch());
                      }
                    }),

Through 'movieBloc.movies.addAll(movieState.movies);', I think that there is a bloc instance in this widget already. With your bloc version and Adnan Alshami's comment, it seems that you need to migrate. — KuKu, Jul 07 '21 at 05:56

The method 'bloc' isn't defined for the type 'BuildContext'

2 Answers2