方法'CreateProfile'在类型'_ProfileScreenState'中未定义。

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13 浏览2023年2月19日

匿名的 2023年2月19日

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我刚接触Flutter，并正在使用Flutter开发用户图像和用户详细信息更新部分。我的代码中出现了以下错误，位于ProfileScreen.dart文件中。非常感谢您的帮助。

错误：在'_ProfileScreenState'类中未定义方法'CreateProfile'。
'_ProfileScreenState'来自'package:image_uploader/Profile/ProfileScreen.dart'（'lib/Profile/ProfileScreen.dart'）。

请将名称更正为现有方法的名称，或定义一个名为'CreateProfile'的方法。

MaterialPageRoute(builder: (context) => CreateProfile()))

^^^^^^^^^^^^^
参数类型'Object'无法赋值给参数类型'ImageProvider?'。

backgroundImage: _imageFile == null?

AssetImage("assets/pic.jpg"):FileImage(file(_imageFile.path)),

ProfileScreen.dart

import 'package:flutter/material.dart';


import 'package:image_uploader/Profile/CreateProfile.dart';
class ProfileScreen extends StatefulWidget {
  ProfileScreen({ Key? key}) : super(key: key);
  @override
  _ProfileScreenState createState() => _ProfileScreenState();
}
class _ProfileScreenState extends State {
  @override
  Widget build(BuildContext context){
    return Scaffold(
      body: button(),
    );
  }
  Widget button() {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 70),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.center,
        children: [
          Text(
            "点击按钮添加个人资料",
            textAlign: TextAlign.center,
            style: TextStyle(
              color: Colors.teal,
              fontSize: 15,
            ),
          ),
          SizedBox(
            height: 30,
          ),
            //button 
            Center(
              child: InkWell(
                onTap: () => {
                Navigator.push(context,
                MaterialPageRoute(builder: (context) => CreateProfile()))
                },
                child: Container(
                  height: 60,
                  width: 150,
                  decoration: BoxDecoration(
                    color: Colors.teal,
                    borderRadius: BorderRadius.circular(20),
                  ),
                  child: Center(
                    child: Text(
                      "添加个人资料",
                      style: TextStyle(
                        color: Colors.white,
                        fontSize: 18,
                      ),
                    ),
                  ),
                ),
              ),
            ),
        ],
      ),
    );
  }
}

CreateProfile.dart

import 'dart:io';


import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'dart:convert';
import 'package:http/http.dart' ;
class CreatProfile extends StatefulWidget {
  CreatProfile({required Key key}) : super(key: key);
  @override
  _CreatProfileState createState() => _CreatProfileState();
}
class _CreatProfileState extends State {
  bool circular = false;
  late PickedFile _imageFile;
 final ImagePicker _picker = ImagePicker();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Form(
        child: ListView(
          padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 30),
          children: [
            imageProfile(),
            SizedBox(
              height: 20,
            ),
            nameTextField(),
            SizedBox(
              height: 20,
            ),
            professionTextField(),
            SizedBox(
              height: 20,
            ),
            dobField(),
            SizedBox(
              height: 20,
            ),
            titleTextField(),
            SizedBox(
              height: 20,
            ),
            aboutTextField(),
            SizedBox(
              height: 20,
            ),
],
    ),
    ),
    );
              }
  Widget imageProfile() {
    return Center(
      child: Stack(children: [
        CircleAvatar(
          radius: 80.0,
          backgroundImage: _imageFile == null? AssetImage("assets/pic.jpg"):FileImage(file(_imageFile.path)),
        ),
        Positioned(
          bottom: 20.0,
          right: 20.0,
          child: InkWell(
            onTap: () {
              showModalBottomSheet(
                context: context,
                builder: ((builder) => bottomSheet()),
              );
            },
            child: Icon(
              Icons.camera_alt,
              color: Colors.teal,
              size: 28.0,
            ),
          ),
        ),
      ]),
    );
  }
  Widget bottomSheet() {
    return Container(
      height: 100.0,
      width: MediaQuery.of(context).size.width,
      margin: EdgeInsets.symmetric(
        horizontal: 20,
        vertical: 20,
      ),
      child: Column(
        children: [
          Text(
            "选择个人照片",
            style: TextStyle(
              fontSize: 20.0,
            ),
          ),
          SizedBox(
            height: 20,
          ),
          Row(mainAxisAlignment: MainAxisAlignment.center, children: [
            TextButton.icon(
              icon: Icon(Icons.camera),
              onPressed: () {
                takePhoto(ImageSource.camera);
              },
              label: Text("相机"),
            ),
            TextButton.icon(
              icon: Icon(Icons.image),
              onPressed: () {
                takePhoto(ImageSource.gallery);
              },
              label: Text("图库"),
            ),
          ])
        ],
      ),
    );
  }
  void takePhoto(ImageSource source) async {
    final pickedFile = await _picker.pickImage(
      source: source,
    );
    setState(() {
      _imageFile = pickedFile as PickedFile;
    });
  }
  //starting text fields
  Widget nameTextField() {
    return TextFormField(
      //controller: _name,
      validator: (value) {
        if (value!.isEmpty) return "姓名不能为空";
        return null;
      },
      decoration: InputDecoration(
        border: OutlineInputBorder(
            borderSide: BorderSide(
              color: Colors.teal,
            )),
        focusedBorder: OutlineInputBorder(
            borderSide: BorderSide(
              color: Colors.orange,
              width: 2,
            )),
        prefixIcon: Icon(
          Icons.person,
          color: Colors.green,
        ),
        labelText: "姓名",
        helperText: "姓名不能为空",
        hintText: "Dev Stack",
      ),
    );
  }
  Widget professionTextField() {
    return TextFormField(
      //controller: _profession,
      validator: (value) {
        if (value!.isEmpty) return "职业不能为空";
        return null;
      },
      decoration: InputDecoration(
        border: OutlineInputBorder(
            borderSide: BorderSide(
              color: Colors.teal,
            )),
        focusedBorder: OutlineInputBorder(
            borderSide: BorderSide(
              color: Colors.orange,
              width: 2,
            )),
        prefixIcon: Icon(
          Icons.person,
          color: Colors.green,
        ),
        labelText: "职业",
        helperText: "职业不能为空",
        hintText: "全栈开发人员",
      ),
    );
  }
  Widget dobField() {
    return TextFormField(
     // controller: _dob,
      validator: (value) {
        if (value!.isEmpty) return "出生日期不能为空";
        return null;
      },
      decoration: InputDecoration(
        border: OutlineInputBorder(
            borderSide: BorderSide(
              color: Colors.teal,
            )),
        focusedBorder: OutlineInputBorder(
            borderSide: BorderSide(
              color: Colors.orange,
              width: 2,
            )),
        prefixIcon: Icon(
          Icons.person,
          color: Colors.green,
        ),
        labelText: "出生日期",
        helperText: "提供出生日期，格式为dd/mm/yyyy",
        hintText: "01/01/2020",
      ),
    );
  }
  Widget titleTextField() {
    return TextFormField(
     // controller: _title,
      validator: (value) {
        if (value!.isEmpty) return "标题不能为空";
        return null;
      },
      decoration: InputDecoration(
        border: OutlineInputBorder(
            borderSide: BorderSide(
              color: Colors.teal,
            )),
        focusedBorder: OutlineInputBorder(
            borderSide: BorderSide(
              color: Colors.orange,
              width: 2,
            )),
        prefixIcon: Icon(
          Icons.person,
          color: Colors.green,
        ),
        labelText: "标题",
        helperText: "不能为空",
        hintText: "Flutter开发人员",
      ),
    );
  }
  Widget aboutTextField() {
    return TextFormField(
     // controller: _about,
      validator: (value) {
        if (value!.isEmpty) return "个人简介不能为空";
        return null;
      },
      maxLines: 4,
      decoration: InputDecoration(
        border: OutlineInputBorder(
            borderSide: BorderSide(
              color: Colors.teal,
            )),
        focusedBorder: OutlineInputBorder(
            borderSide: BorderSide(
              color: Colors.orange,
              width: 2,
            )),
        labelText: "个人简介",
        helperText: "写一些关于自己的话",
        hintText: "我是Dev Stack",
      ),
    );
  }
}

main.dart

import 'package:flutter/material.dart';


import 'package:image_uploader/Profile/ProfileScreen.dart';
void main() {
  runApp(const MyApp());
}
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: '个人资料页面',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: ProfileScreen(),
    );
  }
}

0

1 答案

匿名的 · Answer 1 · 2023-05-19T16:11:31+00:00

在上述代码中，出现了一个问题：'CreateProfile'方法在'_ProfileScreenState'类型中没有被定义。这个问题的原因是在导航器中调用了一个未定义的方法。

要解决这个问题，我们可以尝试以下方法：

1. 确保在导航器中调用的方法名称正确，并且确保方法已经在'_ProfileScreenState'类中被定义。

2. 确保在导航器中调用的方法的参数正确，并且与被调用方法的参数一致。

3. 如果确保方法名称和参数都正确无误，但问题仍然存在，那可能是由于该方法所在的类没有正确导入。请确保已经正确导入包含该方法的类。

希望以上方法能够解决这个问题。如果问题仍然存在，请提供更多的上下文信息，以便我们能够更好地帮助您解决这个问题。