注销后无法返回登录页面/屏幕(不确定注销是否成功)

Question

我是flutter和处理后端的新手。我在退出时遇到了问题，由于缺乏经验，我不知道如何解决。当我注销时，它不会返回到登录屏幕(Authenticate(。我不太确定问题是在我在包装器上写的函数还是在auth中的某个地方。每次运行应用程序时都会执行包装器小部件：

void main(){
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return StreamProvider<User>.value(
value: AuthService().user,
child: new MaterialApp(
debugShowCheckedModeBanner: false,
theme: ThemeData(
primaryColor: Colors.redAccent,
),
home: Wrapper(),
),
);
}
}

包装器代码如下：

class Wrapper extends StatelessWidget {
@override
Widget build(BuildContext context) {
final user = Provider.of<User>(context);
print(user);
if (user == null) {
return Authenticate();
} else {
return MyBottomNavigationBar();
}
}
}

注销按钮功能：

onPressed: () async {
await _auth.signOut();
print('signing out');
},

授权码：

import 'package:firebase_auth/firebase_auth.dart';
import 'package:mudah_replica/models/user.dart';
class AuthService {
final FirebaseAuth _auth = FirebaseAuth.instance;
//Create user object based on FirebaseUser
User _userFromFirebaseUser(FirebaseUser user){
return user != null ? User(uid: user.uid) : null;
}
//Auth change user stream
Stream<User> get user {
return _auth.onAuthStateChanged
//.map((FirebaseUser user) => _userFromFirebaseUser(user));
.map(_userFromFirebaseUser);
}
//Sign in anonymously
Future signInAnon() async {
try {
AuthResult result = await _auth.signInAnonymously();
FirebaseUser user = result.user;
return user;
} catch(e) {
print(e.toString());
return null;
}
}
//Sign in with Email & Password
Future signInWithEmailAndPassword(String email, String password) async {
try {
AuthResult result = await _auth.signInWithEmailAndPassword(email: email, password: password);
FirebaseUser user = result.user;
return _userFromFirebaseUser(user);
} catch(e){
print(e.toString());
return null;
}
}

//Register with Email & Password
Future registerWithEmailAndPassword(String email, String password) async {
try {
AuthResult result = await _auth.createUserWithEmailAndPassword(email: email, password: password);
FirebaseUser user = result.user;
return _userFromFirebaseUser(user);
} catch(e){
print(e.toString());
return null;
}
}
//Sign out
Future signOut() async {
try{
return await _auth.signOut();
} catch(e){
print('Fail to sign out');
print(e.toString());
return null;
}
}
}

Answer 1

在包装类中，您返回的是auth小部件，而不是导航到右侧屏幕，因此它不会路由。相反，您可能需要导航到Auth屏幕。这样做：

onPressed: () async {
await _auth.signOut();
Navigator.push(context,
MaterialPageRoute(builder: (context) => Authenticate())
},