BLoC模式的Flutter Firestore错误 [英] Flutter Firestore error with BLoC pattern
本文介绍了BLoC模式的Flutter Firestore错误的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
扑朔迷离的新手有很多东西,现在才开始弄清楚它是BLoC模式,现在我遇到了一个问题 我不明白如何解决该错误,似乎一切都写正确了 此处是所有BLoC的通用接口
A newbie in flutter has a lot of stuff that is just starting to figure out now it's BLoC pattern and now I ran into a problem I can not understand how to fix this error, seems to have written everything correctly Here generic Interface for all BLoCs
abstract class BlocBase {
void dispose();
}
class BlocProvider<T extends BlocBase> extends StatefulWidget {
BlocProvider({
Key key,
@required this.child,
@required this.bloc,
}) : super(key: key);
final T bloc;
final Widget child;
@override
_BlocProviderState<T> createState() => _BlocProviderState<T>();
static T of<T extends BlocBase>(BuildContext context) {
final type = _typeOf<BlocProvider<T>>();
BlocProvider<T> provider = context.ancestorWidgetOfExactType(type);
return provider.bloc;
}
static Type _typeOf<T>() => T;
}
class _BlocProviderState<T> extends State<BlocProvider<BlocBase>> {
@override
void dispose() {
widget.bloc.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return widget.child;
}
}
这是我使用BLoC的第二个文件,并且出现错误 在这里,我使用功能validateAndCreateData来添加票证
@override
Widget build(BuildContext context) {
final bloc = BlocProvider.of<TicketsBloc>(context);
return Scaffold(
drawer: MyDrawer(),
appBar: AppBar(
title: Text('Sports'),
backgroundColor: Colors.blueGrey[900],
// automaticallyImplyLeading: false,
actions: <Widget>[
IconButton(
icon: Icon(Icons.share),
tooltip: 'Share',
onPressed: () {
Navigator.of(context).pushNamed('/second_screen');
}),
IconButton(
icon: Icon(Icons.account_circle),
tooltip: 'Your account',
onPressed: () {
Navigator.of(context)
.pushReplacementNamed('/account_screen');
}),
IconButton(
icon: Icon(Icons.add),
tooltip: 'Add Tickets',
onPressed: () => validateAndCreateData(bloc),
)
]),
body: MyTab(),
);
}
void validateAndCreateData(TicketsBloc bloc) async {
bloc.createData(description, image, name, price);
}
推荐答案
您的错误表示您无权访问该集团.您必须使用提供程序包装您的应用程序.如果不是这样,您将无法从中继承.
Your error mean you don't have access to the bloc. You must wrap your app with the provider. If not you cannot inherited from this.
return BlocProvider(
child: MaterialApp(
title: 'My App',
home: HomeScreen(),
),
);
这篇关于BLoC模式的Flutter Firestore错误的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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