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这是一个代码:
import 'package:flutter/material.dart';
import 'package:flutterapp/ui/pages/notes_home.dart';
import 'package:provider/provider.dart';
import 'package:flutterapp/ui/pages/splash.dart';
import 'package:flutterapp/ui/pages/user_info.dart';
import 'package:flutterapp/ui/pages/auth/login.dart';
import 'package:flutterapp/model/user_repository.dart';
import 'package:path/path.dart';
class HomePage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return ChangeNotifierProvider(
builder: (_) => UserRepository.instance(),
child: Consumer
// ignore: missing_return
(builder: (context, UserRepository user, _) {
// ignore: missing_return
switch (user.status){
case Status.Uninitialized:
return Splash();
case Status.Unauthenticated:
case Status.Authenticating:
return LoginPage();
case Status.Authenticated:
return NotesHomePage();
}
}),
);
}
}
上面代码中的“builder: (_) => UserRepository.instance()”行显示错误
import 'package:flutter/material.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_sign_in/google_sign_in.dart';
enum Status { Uninitialized, Authenticated, Authenticating, Unauthenticated }
class UserRepository with ChangeNotifier {
FirebaseAuth _auth;
FirebaseUser _user;
GoogleSignIn _googleSignIn;
Status _status = Status.Uninitialized;
UserRepository.instance()
: _auth = FirebaseAuth.instance,
_googleSignIn = GoogleSignIn() {
_auth.onAuthStateChanged.listen(_onAuthStateChanged);
}
Status get status => _status;
FirebaseUser get user => _user;
Future<bool> signIn(String email, String password) async{
try {
_status = Status.Authenticating;
notifyListeners();
await _auth.signInWithEmailAndPassword(email: email, password: password);
return true;
}catch(e){
_status = Status.Unauthenticated;
notifyListeners();
return false;
}
}
Future<bool> signUp(String email, String password) async{
try {
_status = Status.Authenticating;
notifyListeners();
await _auth.createUserWithEmailAndPassword(email: email, password: password);
return true;
}catch(e){
_status = Status.Unauthenticated;
notifyListeners();
return false;
}
}
Future<bool> signInWithGoogle() async{
try{
_status =Status.Authenticating;
notifyListeners();
final GoogleSignInAccount googleUser = await _googleSignIn.signIn();
final GoogleSignInAuthentication googleAuth =
await googleUser.authentication;
final AuthCredential credential = GoogleAuthProvider.getCredential(idToken: googleAuth.idToken, accessToken: googleAuth.accessToken);
await _auth.signInWithCredential(credential);
return true;
}catch(e) {
print(e);
_status = Status.Unauthenticated;
notifyListeners();
return false;
}
}
Future signOut() async {
_auth.signOut();
_googleSignIn.signOut();
_status = Status.Unauthenticated;
notifyListeners();
return Future.delayed(Duration.zero);
}
Future<void> _onAuthStateChanged(FirebaseUser firebaseUser) async{
if(firebaseUser == null) {
_status = Status.Unauthenticated;
}else{
_user = firebaseUser;
_status = Status.Authenticated;
}
notifyListeners();
}
}
请帮忙
import 'package:flutter/material.dart';
import 'package:flutterapp/model/user_repository.dart';
import 'package:provider/provider.dart';
class LoginPage extends StatefulWidget {
@override
_LoginPageState createState() => _LoginPageState();
}
class _LoginPageState extends State<LoginPage> {
final GlobalKey<ScaffoldState> _key = GlobalKey<ScaffoldState>();
bool signInForm;
@override
void initState() {
// TODO: implement initState
super.initState();
signInForm = true;
}
@override
Widget build(BuildContext context) {
final user = Provider.of<UserRepository>(context);
return WillPopScope(
onWillPop: () async{
if(!signInForm) {
setState(() {
signInForm = true;
});
return false;
}else{
return true;
}
},
child: Scaffold(
key: _key,
backgroundColor: Colors.red,
body: SingleChildScrollView(
padding: const EdgeInsets.all(16.0),
child: SizedBox(
width: double.infinity,
child: Column(
children: <Widget>[
const SizedBox(height: kToolbarHeight),
Container(
decoration: BoxDecoration(
color: Colors.white,
shape: BoxShape.circle,
),
width: 60.0,
height: 60.0,
),
const SizedBox(height: 30.0),
RaisedButton(
textColor: Colors.red,
color: Colors.white,
child: Text('Google'),
onPressed: () async{
if(!await user.signInWithGoogle())
showmessage();
},
),
const SizedBox(height: 30.0),
AnimatedSwitcher(
child: signInForm ? LoginForm() : SignupForm(),
duration: Duration(milliseconds: 200),
),
const SizedBox(height: 20.0,),
OutlineButton(
textColor: Colors.white,
child: signInForm ? Text("Sign Up", style: TextStyle(fontWeight: FontWeight.bold, fontSize: 16.0),) : Icon(Icons.arrow_back),
onPressed: () {
setState(() {
signInForm = !signInForm;
});
},
color: Colors.white,
borderSide: BorderSide(color: Colors.white),
highlightColor: Colors.white,
)
],
),
)
),
),
);
}
void showmessage(){
_key.currentState.showSnackBar(SnackBar(
content: Text("Somethimg is wrong"),
));
}
}
class LoginForm extends StatefulWidget {
final Function showError;
const LoginForm({Key key, this.showError}) : super(key: key);
@override
_LoginFormState createState() => _LoginFormState();
}
class _LoginFormState extends State<LoginForm> {
final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
final FocusNode passwordField = FocusNode();
TextEditingController _email;
TextEditingController _password;
@override
void initState() {
_email = TextEditingController();
_password = TextEditingController();
super.initState();
}
@override
Widget build(BuildContext context) {
final user = Provider.of<UserRepository>(context);
return Container(
padding: const EdgeInsets.all(16.0),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(10.0),
),
child: Form(
key: _formKey,
child: Column(
children: <Widget>[
Text("Login", style: Theme.of(context).textTheme.display1,),
const SizedBox(height: 20.0),
TextFormField(
controller: _email,
textInputAction: TextInputAction.next,
decoration: InputDecoration(
labelText: "Email"
),
onEditingComplete: (){
FocusScope.of(context).requestFocus(passwordField);
},
),
const SizedBox(height: 16.0,),
TextFormField(
controller: _password,
focusNode: passwordField,
obscureText: true,
decoration: InputDecoration(
labelText: "Password"
),
),
const SizedBox(height: 20.0),
RaisedButton(
textColor: Colors.red,
child: Text("Login"),
onPressed: () async{
if(_formKey.currentState.validate()){
if(!await user.signIn(
_email.text, _password.text))
widget.showError();
}
},
)
],
),
),
);
}
}
class SignupForm extends StatefulWidget {
@override
_SignupFormState createState() => _SignupFormState();
}
class _SignupFormState extends State<SignupForm> {
final FocusNode passwordField = FocusNode();
final FocusNode confirmPasswordField = FocusNode();
TextEditingController _email;
TextEditingController _password;
TextEditingController _confirmpassword;
final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
@override
void initState() {
_email = TextEditingController();
_password = TextEditingController();
_confirmpassword = TextEditingController();
super.initState();
}
@override
Widget build(BuildContext context) {
final user = Provider.of<UserRepository>(context);
return Container(
padding: const EdgeInsets.all(16.0),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(10.0),
),
child: Form(
key: _formKey,
child: Column(
children: <Widget>[
Text("Sign Up", style: Theme.of(context).textTheme.display1,),
const SizedBox(height: 20.0),
TextFormField(
controller: _email,
textInputAction: TextInputAction.next,
decoration: InputDecoration(
labelText: "Email"
),
onEditingComplete: (){
FocusScope.of(context).requestFocus(passwordField);
},
),
const SizedBox(height: 16.0,),
TextFormField(
obscureText: true,
controller: _password,
focusNode: passwordField,
decoration: InputDecoration(
labelText: "Password"
),
onEditingComplete: ()=> FocusScope.of(context).requestFocus(confirmPasswordField),
),
const SizedBox(height: 16.0,),
TextFormField(
obscureText: true,
controller: _confirmpassword,
focusNode: confirmPasswordField,
decoration: InputDecoration(
labelText: "Confirm Password"
),
onEditingComplete: (){
FocusScope.of(context).requestFocus(passwordField);
},
),
const SizedBox(height: 20.0),
RaisedButton(
textColor: Colors.red,
child: Text("Create Account"),
onPressed: () async{
if(_formKey.currentState.validate()){
if(_confirmpassword.text == _password.text)
if(!await user.signUp(
_email.text, _password.text))
print("Failed to Signup");
}
},
)
],
),
),
);
}
}
最佳答案
在您的代码中,只需更改
builder: (_) => UserRepository.instance(),
至
create: (_) => UserRepository.instance(),
一切都会好起来的!
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