Flutter报错BlocProvider.of() called with a context that does not contain a Bloc of type **.

￡神魔★判官ぃ 2021-12-03 17:21 364阅读 0赞

Flutter报错BlocProvider.of() called with a context that does not contain a Bloc of type **.

在使用flutter_bloc框架创建bloc时，出现报错BlocProvider.of() called with a context that does not contain a Bloc of type **.原因是在创建weight时，未给当前上下文提供bloc.

eg：
1.打开A页面，并在A页面中使用SimpleBloc.
Navigator.push(context, MaterialPageRoute(builder: (context) => ARoute()));
2.在A页面中创建SimpleBloc.

  1. class HomePage extends StatefulWidget {
  2.   @override
  3.   State<StatefulWidget> createState() => HomePageState();
  4. }
  6. class HomePageState extends State<HomePage> {
  7.   @override
  8.   Widget build(BuildContext context) {
  9.     final loginBloc = BlocProvider.of<LoginBloc>(context);
  10.     ...
  11.   }
  12. }

此时会收到上述报错异常，更正为:

  1. Navigator.push(context,
  2.     MaterialPageRoute(builder: (context) {
  3.         return BlocProvider(
  4.             builder: (context) => SimpleBloc(),
  5.             child: ARoute(),
  6.         );
  7. }));

即可。

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