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June 9, 2023 08:47
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import 'package:flutter/material.dart'; | |
void main() { | |
runApp(MyApp()); | |
} | |
// 这是我们的主组件 | |
class MyApp extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return MaterialApp( | |
home: Scaffold( | |
appBar: AppBar( | |
title: Text('用户登录'), // 设置标题 | |
), | |
body: LoginForm(), // 使用我们自定义的 LoginForm | |
), | |
); | |
} | |
} | |
// 这是一个 StatefulWidget,代表了登录表单 | |
class LoginForm extends StatefulWidget { | |
@override | |
_LoginFormState createState() => _LoginFormState(); | |
} | |
// 这是 LoginForm 的状态 | |
class _LoginFormState extends State<LoginForm> { | |
final _usernameController = TextEditingController(); // 控制用户名输入 | |
final _passwordController = TextEditingController(); // 控制密码输入 | |
String _loginMessage = ''; // 用于显示登录消息 | |
// 这是模拟登录的函数 | |
void _login() { | |
// 这里是模拟的 API 调用 | |
Future.delayed(Duration(seconds: 2)).then((_) { | |
setState(() { | |
_loginMessage = '登录成功!'; // 更新登录消息 | |
}); | |
}); | |
} | |
@override | |
Widget build(BuildContext context) { | |
return Padding( | |
padding: const EdgeInsets.all(16.0), | |
child: Column( | |
children: <Widget>[ | |
TextField( | |
controller: _usernameController, | |
decoration: InputDecoration( | |
labelText: '用户名', // 设置标签 | |
), | |
), | |
TextField( | |
controller: _passwordController, | |
decoration: InputDecoration( | |
labelText: '密码', // 设置标签 | |
), | |
obscureText: true, // 隐藏输入的密码 | |
), | |
ElevatedButton( | |
child: Text('登录'), | |
onPressed: _login, // 当按钮被按下时,调用 _login 函数 | |
), | |
Text(_loginMessage), // 显示登录消息 | |
], | |
), | |
); | |
} | |
} |
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