flutter+ui库
时间: 2023-12-14 10:04:35 浏览: 41
Flutter 是一个跨平台的移动应用程序开发框架,它使用 Dart 语言编写。Flutter 提供了丰富的 UI 库,可以轻松构建漂亮的用户界面。以下是一个简单的 Flutter UI 库的例子:
```dart
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,
),
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> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
```
这个例子创建了一个带有计数器的 Flutter 应用程序。它使用了 Material Design 风格的 UI 组件,包括 AppBar、Scaffold、Text、Column 和 FloatingActionButton。在点击 FloatingActionButton 时,计数器会增加并在屏幕上显示。