【发布时间】：2020-11-05 19:37:11
【问题描述】：
如果有人无法理解我的问题，请告知
我已使用 Provider 包来处理身份验证流程。 我正在做的是： Main.dart -> Auth 处理程序小部件（其中包含用于检查 onAuthChange 的流构建器） -> 页面处理程序（如果用户是新用户，它将带用户从那里进入登录屏幕，它被转移到登录使用推送替换的页面）登录后检查用户是否存在数据 -> 如果存在，则将其带到主屏幕 -> 主屏幕包含 3 个选项卡。在主页选项卡中有注销按钮，但是当我按下它时它不起作用。帮帮我。
Main.dart
Provider<AuthBase>(
create: (context)=>Auth(),
child: MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Rapport',
theme: ThemeData(
primaryColor: Color(0xFFE3F2FD),
visualDensity: VisualDensity.adaptivePlatformDensity,
pageTransitionsTheme: PageTransitionsTheme(
builders: {
TargetPlatform.android: CustomPageTransitionsBuilder(),
TargetPlatform.iOS: CustomPageTransitionsBuilder(),
},
),
),
/*This is the routes table. Add all the route names used inside the app here
Add the route name where the route is made as static const String, so as to you don't need to remember anything.
*/
routes: {
//the route name / stands for home / first route in the app.
'/': (ctx) {
return SplashScreen.navigate(
name: 'assets/splash.flr',
next: (context) {
print(isLogin.toString());
return AuthWidgetBuilder(dataExists: myData.length==0,isLogin: isLogin,builder: (context, userSnapshot,isLogin,dataExist) {
return Scaffold(
body: AuthWidget(userSnapshot: userSnapshot,dataExists: myData.length==0,isLogin: isLogin,),
);
});
},
startAnimation: 'Untitled',
until: () => Future.delayed(Duration(seconds: 4)),
backgroundColor: Colors.white,
);
},
LoginScreen.loginRoute: (ctx) => LoginScreen(),
CheckUser.checkRoute: (ctx) => CheckUser(),
OnboardingScreen.onBoardRoute: (ctx) => OnboardingScreen(),
StudentInfo.studentRoute: (ctx) => StudentInfo(),
PersonalDetails.routeName:(ctx) => PersonalDetails(),
ProfessionalDetails.routeName:(ctx) => ProfessionalDetails(),
AddressDetails.routeName: (ctx) => AddressDetails(),
TeacherHomeScreen.routeName:(ctx)=>TeacherHomeScreen(),
TeacherVerification.routeName:(ctx)=>TeacherVerification(),
StudentHomeScreen.routeName : (ctx)=>StudentHomeScreen(),
},
),
);
Auth_Widget_Builder
class AuthWidgetBuilder extends StatelessWidget {
const AuthWidgetBuilder({Key key, @required this.builder,@required this.isLogin,@required this.dataExists}) : super(key: key);
final Widget Function(BuildContext, AsyncSnapshot<User>,String,bool) builder;
final String isLogin;
final bool dataExists;
@override
Widget build(BuildContext context) {
print('AuthWidgetBuilder rebuild');
print(dataExists);
final authService =
Provider.of<AuthBase>(context, listen: false);
return StreamBuilder<User>(
stream: authService.onAuthStateChanged,
builder: (context, snapshot) {
print('StreamBuilder: ${snapshot.connectionState}');
final User user = snapshot.data;
if (user != null) {
SharedPrefFunction().saveLoginPreference();
return MultiProvider(
providers: [
Provider<User>.value(value: user),
],
child: builder(context, snapshot,'true',dataExists),
);
}
return builder(context, snapshot,isLogin,dataExists);
},
);
}
}
Auth.Widget
class AuthWidget extends StatelessWidget {
const AuthWidget({Key key, @required this.userSnapshot,this.dataExists,this.isLogin}) : super(key: key);
final AsyncSnapshot<User> userSnapshot;
final String isLogin;
final bool dataExists;
@override
Widget build(BuildContext context) {
if (userSnapshot.connectionState == ConnectionState.active) {
if(isLogin == null){
return OnboardingScreen();
}
else{
return userSnapshot.hasData ? CheckUser(dataExist: dataExists,) : LoginScreen();
}
}
return Scaffold(
body: Center(
child: CircularProgressIndicator(),
),
);
}
}
如果数据存在，则在 checkUser.dart 中
homePage(BuildContext context) {
print('checkUser');
if (dataExists) {
return Scaffold(
body: SafeArea(
child: Container(
child: Column(
children: <Widget>[
Text(
'Welcome',
style: kTextStyle,
),
FlatButton.icon(
onPressed: () {
setState(() {
Navigator.of(context).pushReplacementNamed(
StudentHomeScreen.routeName, //This line is changed by me. This code is not correct and needs to be changed.
);
});
},
icon: Icon(Icons.home),
label: Text('Home'),
),
],
),
),
),
);
} else {
return getInfoPage();
}
}
Student_Home_Screen.dart
class _StudentHomeState extends State<StudentHomeScreen> {
bool _isProfilePicSet = false;
int _currentTabIndex = 1;
var _tabs = [
Center(
child: Text('Search Tab'),
),
HomeTab(),
Center(
child: Text('Profile Tab'),
),
];
@override
Widget build(BuildContext context) {
var size = MediaQuery.of(context).size;
return Scaffold(
backgroundColor: Colors.white,
body: _tabs[_currentTabIndex],
bottomNavigationBar: BottomNavigationBar(
// type: BottomNavigationBarType.shifting,
backgroundColor: Colors.white,
// fixedColor: Colors.black,
iconSize: 24,
selectedIconTheme: IconThemeData(
color: themeColor,
opacity: 1,
),
unselectedIconTheme: IconThemeData(
color: themeColor,
opacity: 0.6,
),
showUnselectedLabels: false,
showSelectedLabels: true,
elevation: 10,
currentIndex: _currentTabIndex,
onTap: (index) {
setState(() {
_currentTabIndex = index;
});
},
items: [
BottomNavigationBarItem(
icon: Icon(Icons.search),
title: Text(
'Search',
style: subhead2.copyWith(color: themeColor),
),
),
BottomNavigationBarItem(
icon: Icon(Icons.home),
title: Text(
'Home',
style: subhead2.copyWith(color: themeColor),
),
),
BottomNavigationBarItem(
icon: CircleAvatar(
backgroundImage: _isProfilePicSet
? NetworkImage('set link here')
: AssetImage('assets/images/default.png'),
maxRadius: 12,
),
title: Text(
'Profile',
style: subhead2.copyWith(color: themeColor),
),
),
],
),
);
}
}
Hometab 中的退出按钮功能
Future<void> _signOut(BuildContext context) async {
try {
final auth = Provider.of<AuthBase>(context, listen: false);
await auth.signOut();
} catch (e) {
print(e);
}
}
【问题讨论】：
-
您实际上遇到了什么错误？是 Provider not found 错误还是类似的错误？检查错误日志应该始终是第一步。
-
我没有收到任何错误。我已将 AuthBase 提供程序放在顶部，以便我可以从任何页面注销，但它没有发生。我不知道为什么会这样。
-
感谢@bizz84 帮助我。我已经在下面发布了你的答案
标签： flutter flutter-provider state-management flutter-state