错误 BlocProvider.of() 调用的上下文不包含 Bloc<dynamic， dynamic>

Question

这是我的主要类main.dart：

import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:provider/provider.dart';
import 'package:bwa_flutix/services/services.dart';
import 'bloc/bloc.dart';
import 'ui/pages/pages.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return StreamProvider.value(
value: AuthServices.userStream,
child: MultiBlocProvider(
providers: [BlocProvider(create: (_) => PageBloc())],
child: MaterialApp(
debugShowCheckedModeBanner: false, home: Wrapper())));
}
}

Error ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY╞═══════════════════════════════════════════════════════════
The following assertion was thrown building Wrapper(dependencies:
[_InheritedProviderScope<FirebaseUser>]):
BlocProvider.of() called with a context that does not contain a Bloc of type Bloc<dynamic, dynamic>.
No ancestor could be found starting from the context that was passed to
BlocProvider.of<Bloc<dynamic, dynamic>>().
This can happen if the context you used comes from a widget above the BlocProvider.
I/flutter (12415):
The context used was: BlocBuilder<Bloc<dynamic, dynamic>, dynamic>(dirty, state:
_BlocBuilderBaseState<Bloc<dynamic, dynamic>, dynamic>#840bd(lifecycle state: created))

导致错误的相关小部件是： 包装纸

包装器.dart.

part of 'pages.dart';
class Wrapper extends StatelessWidget {
@override
Widget build(BuildContext context) {
FirebaseUser firebaseUser = Provider.of<FirebaseUser>(context);
if (firebaseUser == null) {
if (!(prevPageEvent is GoToSplashPage)) {
prevPageEvent = GoToSplashPage();
context.bloc<PageBloc>().add(prevPageEvent);
}
} else {
if (!(prevPageEvent is GoToMainPage)) {
prevPageEvent = GoToMainPage();
context.bloc<PageBloc>().add(prevPageEvent);
}
}
return BlocBuilder(
builder: (_, pageState) => (pageState is OnSplashPage)
? SplashPage()
: (pageState is OnLoginPage) ? SignInPage() : MainPage());}}

Answer 1

你会尝试测试下面的代码吗？

class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: StreamProvider.value(
value: AuthServices.userStream,
child: MultiBlocProvider(
providers: [BlocProvider(create: (_) => PageBloc())],
child: Wrapper(),
),
),
);
}
}