Question


class Drawer extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Drawer(
      child: ListView(
        padding: EdgeInsets.zero,
        children: [
          UserAccountsDrawerHeader(
            accountName: Text("Anus"),
            accountEmail: Text("Anus@gmail.com"),
            currentAccountPicture: CircleAvatar(
              backgroundImage: NetworkImage(
                  "https://images.unsplash.com/photo-1533227268428-f9ed0900fb3b?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1158&q=80"),
            ),
          ),
          ListTile(
            leading: Icon(Icons.person),
            title: Text("Account"),
            subtitle: Text("Personal"),
            trailing: Icon(Icons.edit),
          ),
          ListTile(
            leading: Icon(Icons.email),
            title: Text("Email"),
            subtitle: Text("anus@gmail.com"),
            trailing: Icon(Icons.send),
          ),
        ],
      ),
    );
  }
}

如何解决该问题

我想创建抽屉，但是当我尝试在抽屉的新文件中创建抽屉时未定义命名参数'child'。

Answer 1

您在定义该小部件时使用了相同的小部件。
这是有效的代码。

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: _buildBody(),
      floatingActionButton: FloatingActionButton(
        onPressed: () {},
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }

  Widget _buildBody() {
    return Drawer();
  }
}

class Drawer extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ListView(
      padding: EdgeInsets.zero,
      children: [
        UserAccountsDrawerHeader(
          accountName: Text("Anus"),
          accountEmail: Text("Anus@gmail.com"),
          currentAccountPicture: CircleAvatar(
            backgroundImage: NetworkImage(
                "https://images.unsplash.com/photo-1533227268428-f9ed0900fb3b?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1158&q=80"),
          ),
        ),
        ListTile(
          leading: Icon(Icons.person),
          title: Text("Account"),
          subtitle: Text("Personal"),
          trailing: Icon(Icons.edit),
        ),
        ListTile(
          leading: Icon(Icons.email),
          title: Text("Email"),
          subtitle: Text("anus@gmail.com"),
          trailing: Icon(Icons.send),
        ),
      ],
    );
  }
}

抽屉颤振中未定义如何解决有问题的孩子

1 个答案: