flutter - '_route == ModalRoute.of(context)' : is not true

Question

当我将我的应用程序打开到登录屏幕时，屏幕工作正常但没有发生任何事情，现在，当我单击注册按钮并尝试单击返回登录时，出现此错误

    ======== Exception caught by widgets library =======================================================
The following assertion was thrown building Form-[LabeledGlobalKey<FormState>#d062b](state: FormState#ba10e):
'package:flutter/src/widgets/will_pop_scope.dart': Failed assertion: line 61 pos 12: '_route == ModalRoute.of(context)': is not true.


Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
  https://github.com/flutter/flutter/issues/new?template=BUG.md

The relevant error-causing widget was: 
  Form-[LabeledGlobalKey<FormState>#d062b] file:///C:/Users/Dell%20Latitude/AndroidStudioProjects/handyman_client/lib/screens/home_page.dart:61:65
When the exception was thrown, this was the stack: 
#2      _WillPopScopeState.didUpdateWidget (package:flutter/src/widgets/will_pop_scope.dart:61:12)
#3      StatefulElement.update (package:flutter/src/widgets/framework.dart:4815:58)
#4      Element.updateChild (package:flutter/src/widgets/framework.dart:3314:15)
#5      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4652:16)
#6      StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4800:11)
...
====================================================================================================

======== Exception caught by widgets library =======================================================
Duplicate GlobalKey detected in widget tree.
====================================================================================================

在查看它之后，我看到它来 self 的表单小部件这是我的代码:但请注意表单小部件

    import 'package:auto_size_text/auto_size_text.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:handyman_client/models/login_model.dart';
import 'package:provider/provider.dart';

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SingleChildScrollView(
        child: Container(
            margin: EdgeInsets.only(top: 50),
            child: Column(
                children: [
                  Row(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      Image.asset("assests/images/onboarding1.png", width: 80, height: 80,),
                      Container(
                          margin: EdgeInsets.only(top: 50),
                          child: AutoSizeText(
                            "HANDYMAN",
                            style: TextStyle(
                                color: Color(0xFF2AF219),
                                fontSize: 14,
                                fontFamily: 'Ramabhadra',
                                fontWeight: FontWeight.w900
                            ),
                          )
                      )
                    ],
                  ),
                  SizedBox(height: 20,),
                  Container(
                    padding: EdgeInsets.symmetric(horizontal: 20),
                    child: Consumer<LoginModel>(
                      builder: (context, mLoginValue, child) => Form(
                        key: mLoginValue.formKey,
                        child: Column(
                          mainAxisAlignment: MainAxisAlignment.center,
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            AutoSizeText(
                              "Hire skilled handy workers that lives in you area",
                              maxLines: 3,
                              style: TextStyle(
                                  color: Color(0xFF2AF219),
                                  fontSize: 25,
                                  fontFamily: 'Ramabhadra',
                                  fontWeight: FontWeight.w900
                              ),
                            ),
                            SizedBox(height: 12,),
                            AutoSizeText(
                              "Sign In",
                              maxLines: 2,
                              style: TextStyle(
                                  color: Color(0xFFC4C4C4),
                                  fontFamily: 'Ramabhadra',
                                  fontSize: 24
                              ),
                            ),
                            SizedBox(height: 10,),
                            AutoSizeText(
                              "Email",
                              style: TextStyle(
                                color: Color(0xFF2AF219),
                                fontFamily: 'Ramabhadra',
                              ),
                            ),
                            SizedBox(height: 10,),
                            Container(
                              padding: EdgeInsets.only(left: 16.0),
                              height: 50,
                              decoration: BoxDecoration(
                                  color: Colors.white,
                                  borderRadius: BorderRadius.circular(16.0),
                                  boxShadow: [
                                    BoxShadow(
                                        color: Color.fromRGBO(0, 0, 0, 0.1),
                                        offset: Offset(6, 2),
                                        blurRadius: 6.0,
                                        spreadRadius: 3.0
                                    )
                                  ]
                              ),
                              child: TextFormField(
                                validator: (v) => mLoginValue.validateEmail(v),
                                controller: mLoginValue.emailController,
                                keyboardType: TextInputType.emailAddress,
                                decoration: InputDecoration(
                                    border: InputBorder.none,
                                    hintText: "email@mail.com",
                                    hintStyle: TextStyle(
                                      color: Color(0xFFC4C4C4),
                                      fontFamily: 'Ramabhadra',
                                    )
                                ),
                              ),
                            ),
                            SizedBox(height: 12,),
                            AutoSizeText(
                              "Password",
                              style: TextStyle(
                                color: Color(0xFF2AF219),
                                fontFamily: 'Ramabhadra',
                              ),
                            ),
                            SizedBox(height: 10,),
                            Container(
                              padding: EdgeInsets.only(left: 16.0),
                              height: 50,
                              decoration: BoxDecoration(
                                  color: Colors.white,
                                  borderRadius: BorderRadius.circular(16.0),
                                  boxShadow: [
                                    BoxShadow(
                                        color: Color.fromRGBO(0, 0, 0, 0.1),
                                        offset: Offset(6, 2),
                                        blurRadius: 6.0,
                                        spreadRadius: 3.0
                                    )
                                  ]
                              ),
                              child: TextFormField(
                                controller: mLoginValue.passwordController,
                                validator: (v) => mLoginValue.validatePassword(v),
                                obscureText: true,
                                decoration: InputDecoration(
                                    border: InputBorder.none,
                                    hintText: "password",
                                    hintStyle: TextStyle(
                                      color: Color(0xFFC4C4C4),
                                      fontFamily: 'Ramabhadra',
                                    )
                                ),
                              ),
                            ),
                          ],
                        ),
                      ),
                    ),
                  ),
                  SizedBox(height: 15,),
                  Container(
                    margin: EdgeInsets.only(left: 180),
                    child: FlatButton(
                      onPressed: (){
                        Navigator.pushNamed(context, '/forgotPassword');
                      },
                      child: AutoSizeText(
                        "Forgot Password",
                        style: TextStyle(
                          color: Color(0xFFC4C4C4),
                          fontFamily: 'Ramabhadra',
                        ),
                      ),
                    ),
                  ),
                  SizedBox(height: 20,),
                  Container(
                    child:  Consumer<LoginModel>(
                      builder: (context, mLoginValue, child) => InkWell(
                        onTap: () async {
                          mLoginValue.createLogin();
                          if(mLoginValue.isVerified){
                            Navigator.pushNamed(context, '/profileImageScreen');
                          }
                        },
                        child: CircleAvatar(
                          radius: 28.93,
                          backgroundColor: Colors.black,
                          foregroundColor: Colors.white,
                          child: Icon(Icons.arrow_forward),
                        ),
                      ),
                    ),
                  ),

                  Row(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      AutoSizeText(
                        "Don't have account?",
                        style: TextStyle(
                            color: Color(0xFF464444),
                            fontFamily: 'Ramabhadra',
                            fontSize: 11
                        ),
                      ),
                      FlatButton(
                          onPressed: (){
                            Navigator.pushNamed(context, '/clientSignUp');
                          },
                          child: AutoSizeText(
                            "Click Here",
                            style: TextStyle(
                                color: Color(0xFF2AF219),
                                fontFamily: 'Ramabhadra',
                                fontSize: 11,
                                fontWeight: FontWeight.bold
                            ),
                          )
                      )
                    ],
                  ),
                  Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      AutoSizeText(
                        "For more information visit",
                        style: TextStyle(
                            color: Color(0xFF464444),
                            fontFamily: 'Ramabhadra',
                            fontSize: 11
                        ),
                      ),
                      SizedBox(height: 50,),
                      FlatButton(
                          onPressed: (){},
                          child: AutoSizeText(
                            "www.handyman.com",
                            style: TextStyle(
                                color: Color(0xFF2AF219),
                                fontFamily: 'Ramabhadra',
                                fontSize: 11,
                                fontWeight: FontWeight.bold
                            ),
                          )
                      )
                    ],
                  )
                ]
            )
        ),
      ),
    );
  }
}

我还使用了供应商这是代码:

import 'package:flutter/cupertino.dart';
import 'package:handyman_client/signUp_Validation/validate.dart';

class LoginModel extends ChangeNotifier with ValidationMixin {
  TextEditingController emailController = TextEditingController();
  TextEditingController passwordController = TextEditingController();

  final formKey = GlobalKey<FormState>();

  String _message = "";
  bool _isVerified = false;

  set message(msg) {
    _message = msg;
    notifyListeners();
  }
  get message {
    return this._message;
  }

  set isVerified(bool verified) {
    _isVerified = verified;
    notifyListeners();
  }

  get isVerified {
    return this._isVerified;
  }

  Future<void> createLogin() {
    if (validateForm()) {
      emailController.text;
      passwordController.text;
      isVerified = true;
    }else {
      message = "Please fill the form";
      isVerified = false;
    }
    notifyListeners();
  }

  bool validateForm() {
    return formKey.currentState.validate();
  }
}

请问我该如何解决？

Answer 1

改变这个

final formKey = GlobalKey<FormState>();

到

GlobalKey<FormState> formKey = GlobalKey<FormState>();