Flutter 需要了解Flatter_bloc如何注入bloc的帮助吗
据我目前所知,在runApp方法级别提供一个bloc可以使它在所有应用程序中都可用。我错了吗 我有这个实现 我的主.dart文件Flutter 需要了解Flatter_bloc如何注入bloc的帮助吗,flutter,bloc,flutter-bloc,Flutter,Bloc,Flutter Bloc,据我目前所知,在runApp方法级别提供一个bloc可以使它在所有应用程序中都可用。我错了吗 我有这个实现 我的主.dart文件 void main() => runApp( RepositoryProvider<AuthenticationRepository>( create: (context) { return AuthenticationService(); }, child: Multi
void main() => runApp(
RepositoryProvider<AuthenticationRepository>(
create: (context) {
return AuthenticationService();
},
child: MultiBlocProvider(
providers: [
BlocProvider<AuthenticationBloc>(
create: (context) {
final authService =
RepositoryProvider.of<AuthenticationRepository>(context);
return AuthenticationBloc(authService)..add(AppLoaded());
},
),
BlocProvider<SignupBloc>(
create: (context) {
final authService =
RepositoryProvider.of<AuthenticationRepository>(context);
return SignupBloc(authService);
},
)
],
child: MyApp(),
),
),
);
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: BlocBuilder<AuthenticationBloc, AuthenticationState>(
builder: (context, state) {
if (state is AuthenticationSuccess) {
return MainScreen(user: state.user);
}
return LoginScreen();
},
),
);
}
}
void main()=>runApp(
寄存提供者(
创建:(上下文){
返回AuthenticationService();
},
子对象:MultiBlocProvider(
供应商:[
BlocProvider(
创建:(上下文){
最终授权服务=
RepositoryProvider.of(上下文);
返回AuthenticationBloc(authService)…添加(apploated());
},
),
BlocProvider(
创建:(上下文){
最终授权服务=
RepositoryProvider.of(上下文);
返回SignupBloc(authService);
},
)
],
子项:MyApp(),
),
),
);
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
主样本:颜色。蓝色,
视觉密度:视觉密度。自适应平台密度,
),
主页:BlocBuilder(
生成器:(上下文、状态){
如果(状态为AuthenticationSuccess){
返回主屏幕(用户:state.user);
}
返回LoginScreen();
},
),
);
}
}
然后我有一个小部件:
import 'dart:developer';
import 'package:myapp/features/signup/bloc/signup_bloc.dart';
import 'package:myapp/shared/ui/textStyles.dart';
import 'package:myapp/shared/ui/widgets.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:provider/provider.dart';
class ProfileInfoForm extends StatefulWidget {
@override
_ProfileInfoFormState createState() => _ProfileInfoFormState();
}
class _ProfileInfoFormState extends State<ProfileInfoForm> {
String _firstname, _lastname, _city, _country, _gender = "";
GlobalKey<FormState> _key = GlobalKey<FormState>();
List<bool> _selections = List.generate(2, (index) => false);
@override
Widget build(BuildContext context) {
final _signupBloc = Provider.of<SignupBloc>(context);
return BlocListener<SignupBloc, SignupState>(
listener: (context, state) {
if (state is CreateAccountFailure) {
log("message");
}
},
child: BlocBuilder(
builder: (context, state) {
if (state is CreateAccountLoading) {
return CircularProgressIndicator();
}
return SingleChildScrollView(
child: Container(
child: Center(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Form(
key: _key,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
SizedBox(
height: 250,
),
Padding(
padding: const EdgeInsets.all(8.0),
child: CustomTextField(
hintText: "Firstname",
secured: false,
onSave: (value) {
setState(() {
_firstname = value;
});
},
onValidate: (value) {
if (value == "") {
return "Please enter your firstname";
}
},
),
),
Padding(
padding: const EdgeInsets.all(8.0),
child: CustomTextField(
hintText: "Lastname",
secured: false,
onSave: (value) {
setState(() {
_lastname = value;
});
},
onValidate: (value) {
if (value == "") {
return "Please enter your lastname";
}
},
),
),
Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
children: [
Expanded(
child: Text(
"Select your gender",
style: blackSubTitle,
),
),
ToggleButtons(
fillColor: Colors.white,
renderBorder: true,
color: Colors.black,
selectedBorderColor: Colors.redAccent,
borderRadius: BorderRadius.circular(20),
children: [
Container(
alignment: Alignment.center,
// decoration: BoxDecoration(borderRadius: BorderRadius.circular(20)),
width: ScreenUtil().setWidth(220),
child: Text(
"Female",
style: blackSubTitle,
),
),
Container(
alignment: Alignment.center,
width: ScreenUtil().setWidth(220),
child: Text(
"Male",
style: blackSubTitle,
),
),
],
isSelected: _selections,
onPressed: (index) {
setState(() {
_selections =
List.generate(2, (index) => false);
_selections[index] = !_selections[index];
if (_selections.elementAt(0) == true) {
setState(() {
_gender = "Female";
});
}
if (_selections.elementAt(1) == true) {
setState(() {
_gender = "Male";
});
}
});
},
)
],
),
),
Padding(
padding: const EdgeInsets.all(8.0),
child: FlatButton(
onPressed: () {
if (_key.currentState.validate()) {
_key.currentState.save();
// _signupBloc.add(
// InitProfilePressed(
// firstname: _firstname,
// lastname: _lastname,
// gender: _gender),
// );
} else {}
},
child: Row(
children: [
Expanded(
child: Container(
alignment: Alignment.center,
width: 200,
height: 60,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(30),
color: Colors.black,
),
child: Text(
"Continue",
style: whiteSubTitle,
),
),
),
],
),
),
)
],
),
),
),
),
),
);
},
),
);
}
}
导入“dart:developer”;
导入“包:myapp/features/signup/bloc/signup_bloc.dart”;
导入“package:myapp/shared/ui/textStyles.dart”;
导入“package:myapp/shared/ui/widgets.dart”;
进口“包装:颤振/材料.省道”;
进口“包装:颤振团/颤振团.飞镖”;
导入“package:flatter_screenutil/flatter_screenutil.dart”;
导入“包:provider/provider.dart”;
类ProfileInfoForm扩展StatefulWidget{
@凌驾
_ProfileInfoFormState createState()=>ProfileInfoFormState();
}
类_ProfileInfoFormState扩展状态{
字符串_firstname、_lastname、_city、_country、_gender=“”;
GlobalKey _key=GlobalKey();
List _selections=List.generate(2,(index)=>false);
@凌驾
小部件构建(构建上下文){
final _signupBloc=Provider.of(上下文);
返回BlocListener(
侦听器:(上下文、状态){
如果(状态为CreateAccountFailure){
日志(“消息”);
}
},
孩子:BlocBuilder(
生成器:(上下文、状态){
如果(状态为CreateAccountLoading){
返回循环ProgressIndicator();
}
返回SingleChildScrollView(
子:容器(
儿童:中心(
孩子:填充(
填充:常数边集全部(8.0),
孩子:表格(
键:_键,
子:列(
crossAxisAlignment:crossAxisAlignment.start,
儿童:[
大小盒子(
身高:250,
),
填充物(
填充:常数边集全部(8.0),
子项:CustomTextField(
hintText:“名字”,
安全:错误,
onSave:(值){
设置状态(){
_firstname=值;
});
},
onValidate:(值){
如果(值==“”){
返回“请输入您的名字”;
}
},
),
),
填充物(
填充:常数边集全部(8.0),
子项:CustomTextField(
hintText:“姓氏”,
安全:错误,
onSave:(值){
设置状态(){
_lastname=值;
});
},
onValidate:(值){
如果(值==“”){
返回“请输入您的姓氏”;
}
},
),
),
填充物(
填充:常数边集全部(8.0),
孩子:排(
儿童:[
扩大(
子:文本(
“选择您的性别”,
风格:黑色字幕,
),
),
切换按钮(
fillColor:Colors.white,
渲染器顺序:对,
颜色:颜色,黑色,
selectedBorderColor:Colors.redAccent,
边界半径:边界半径。圆形(20),
儿童:[
容器(
对齐:对齐.center,
//装饰:盒子装饰(边框半径:边框半径。圆形(20)),
宽度:ScreenUtil().setWidth(220),
子:文本(
“女性”,
风格:黑色字幕,
),
),
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.
The context used was: BlocBuilder<Bloc<dynamic, dynamic>, dynamic>(dirty, state: _BlocBuilderBaseState<Bloc<dynamic, dynamic>,
child: BlocBuilder<SignupBloc, SignupState>(
return BlocConsumer<SignupBloc, SignupState>(
listener: (context, state) {
if (state is CreateAccountFailure) {
log("message");
}
},
builder: (context, state) {
if (state is CreateAccountLoading) {
return CircularProgressIndicator();
}