向Firebase Flutter注册后无法导航到主页

我试图在登录后导航到主页，这可行，我遵循了这个教程：

https://www.youtube.com/watch?v=oJ5Vrya3wCQ&t=307s

但是，我的问题是，当我去注册按钮>注册用户时，我直接进入登录页面，但是当我填写登录表单并登录时，什么也没发生，我必须做一个“热重启”才能看到我的主页，就好像某些小部件没有重建一样。所以我应该做任何更好的清洁方法来进行状态管理？

主要：

import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:plantsapp/screens/login_page.dart';
import 'package:plantsapp/screens/plant_screen.dart';
import 'package:plantsapp/screens/register_page.dart';
import 'package:plantsapp/screens/shop_scree_page.dart';
import 'package:plantsapp/services/authentication_service.dart';
import 'package:provider/provider.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MultiProvider(
      providers: [
        ChangeNotifierProvider<AuthenticationService>(
          create: (_) => AuthenticationService(FirebaseAuth.instance),
        ),
        StreamProvider(create: (context) => context.read<AuthenticationService>().authStateChanges)
      ],
      child: MaterialApp(
        title: 'Flutter Plant Shop UI',
        debugShowCheckedModeBanner: false,
        home: AuthenticationWrapper(),
        routes: {
          'registerpage': (context) => RegisterPage(),
          'loginpage': (context) => LoginPage(),
          'homepage': (context) => PlantScreen(),
        },
        
        //theme: ThemeData.dark(),
      ),
    );
  }
}

// ignore: must_be_immutable
class AuthenticationWrapper extends StatelessWidget with ChangeNotifier{
  @override
  Widget build(BuildContext context) {
    final firebaseuser = context.watch<User>();
    notifyListeners();
    if(firebaseuser != null) {
      notifyListeners();
      return ShopScreen(); 
    } else {
      notifyListeners();
      return LoginPage();
    }
  }
}

认证服务：

import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/cupertino.dart';



class AuthenticationService with ChangeNotifier{
  final FirebaseAuth _firebaseAuth;

  AuthenticationService(this._firebaseAuth);

  Stream<User> get authStateChanges => _firebaseAuth.authStateChanges();

  Future<String> signIn({String email, String password}) async {
    try {
      await _firebaseAuth.signInWithEmailAndPassword(email: email, password: password);
      notifyListeners();
      return "Signed in";
    } on FirebaseAuthException catch (e) {
      print(e);
      return e.message;
    }
  }

  Future<String> signUp({String email, String password, BuildContext context}) async{
    try {
      await _firebaseAuth.createUserWithEmailAndPassword(email: email, password: password);
      print('USUARIO REGISTRADO');
      Navigator.pushReplacementNamed(context, 'loginpage');
      return "Signed Up";
    } on FirebaseAuthException catch (e) {
      print(e.message);
      return e.message;
    }
  }

  Future<void> signOut() async{
    await _firebaseAuth.signOut();
    notifyListeners();
  }

}

登录页：

import 'package:flutter/material.dart';
import 'package:plantsapp/services/authentication_service.dart';
import 'package:provider/provider.dart';

class LoginPage extends StatefulWidget{
  @override
  _LoginPageState createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage>{
  final TextEditingController emailController = TextEditingController();
  final TextEditingController passwordController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SingleChildScrollView(
        child: Container(
          margin: EdgeInsets.symmetric(horizontal: 20, vertical: 80),
          padding: EdgeInsets.symmetric(horizontal: 20, vertical: 80),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text(
                'Login',
                style: TextStyle(fontSize: 20),
              ),
              _emailForm(),
              _passwordForm(),
              _button(),
              _buttonRegister(),
            ],
          ),
        ),
      ),
    );
  }

  Widget _emailForm() {
    return TextField(
      controller: emailController,
      decoration: InputDecoration(hintText: ('Email')),
    );
  }

  Widget _passwordForm() {
    return TextField(
      controller: passwordController,
      decoration: InputDecoration(hintText: ('Password')),
    );
  }

  Widget _button() {
    return RaisedButton(
      child: Text('Login'),
      onPressed: () {
        Provider.of<AuthenticationService>(context, listen: false).signIn(
            email: emailController.text.trim(),
            password: passwordController.text.trim());
      },
    );
  }

  _buttonRegister() {
    return RaisedButton(
      child: Text('Registrarse'),
      onPressed: () {
        Navigator.pushReplacementNamed(context, 'registerpage');
      },
    );
  }
}

RegisterPage：

import 'package:flutter/material.dart';
import 'package:plantsapp/services/authentication_service.dart';
import 'package:provider/provider.dart';

class RegisterPage extends StatefulWidget {
  RegisterPage({Key key}) : super(key: key);

  @override
  _RegisterPageState createState() => _RegisterPageState();
}

class _RegisterPageState extends State<RegisterPage> {
  final TextEditingController emailController = TextEditingController();
  final TextEditingController passwordController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SingleChildScrollView(
        child: Container(
          margin: EdgeInsets.symmetric(horizontal: 20, vertical: 80),
          padding: EdgeInsets.symmetric(horizontal: 20, vertical: 80),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text(
                'Registrarse',
                style: TextStyle(fontSize: 30),
              ),
              _emailForm(),
              _passwordForm(),
              _button(),
            ],
          ),
        ),
      ),
    );
  }

  Widget _emailForm() {
    return TextField(
      controller: emailController,
      decoration: InputDecoration(hintText: ('Email')),
    );
  }

  Widget _passwordForm() {
    return TextField(
      controller: passwordController,
      decoration: InputDecoration(hintText: ('Password')),
    );
  }

  Widget _button() {
    return RaisedButton(
      child: Text('Registrarse'),
      onPressed: () {
        Provider.of<AuthenticationService>(context, listen: false).signUp(
            email: emailController.text.trim(),
            password: passwordController.text.trim(),
            context: context);
      },
    );
  }
}