【Flutter】【widget】【card】卡片组件的使用和练习代码

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前言

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一、card是什么？

卡片组件，可以制作很多卡片类型的widget，比如商品，个人信息卡片等

二、使用步骤

1.基础的使用

代码如下（示例）：

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
    
    
  const MyApp({
    
    super.key});

  @override
  Widget build(BuildContext context) {
    
    
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
    
    
  const MyHomePage({
    
    super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> 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>[
            Card(
              color: Colors.indigoAccent,//卡片的颜色
              elevation: 10,//阴影的大小
              shadowColor: Colors.amber,//阴影的颜色
              margin:const EdgeInsets.all(5),//外边距
              shape: const RoundedRectangleBorder(
                  borderRadius: BorderRadius.all(Radius.circular(15))),
              child: Column(
                children: [
                  const ListTile(
                    leading: Icon(Icons.people),
                    title: Text('JACK MA'),
                    subtitle: Text('mamamiya'),
                  ),
                  ButtonBar(
                    children: [
                      ElevatedButton(
                          onPressed: () {
    
    }, child: const Text('YES')),
                      ElevatedButton(
                          onPressed: () {
    
    }, child: const Text('NOT')),
                    ],
                  )
                ],
              ),
            )
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

2.提升

自己制作一个商品滚动列表，使用card来制作，给card 添加圆角，图片添加圆角。显示部分商品的信息.

CircleAvatar：用户头像的圆角的控件，快速制作用户头像。或者是文本的原型

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
    
    
  const MyApp({
    
    super.key});

  @override
  Widget build(BuildContext context) {
    
    
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
    
    
  const MyHomePage({
    
    super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
    
    
  Widget mycard() {
    
    
    return Card(
      // color: Colors.indigoAccent, //卡片的颜色
      elevation: 10, //阴影的大小
      shadowColor: Colors.grey, //阴影的颜色
      margin: const EdgeInsets.all(5), //外边距
      shape: const RoundedRectangleBorder(
          borderRadius: BorderRadius.all(Radius.circular(15))),
      child: Column(
        children: [
          //给图片加个外边距和圆角
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: ClipRRect(
              borderRadius: const BorderRadius.all(Radius.circular(15)),
              child: Image.asset('assets/shoes.jpeg'),
            ),
          ),
          const ListTile(
            leading: CircleAvatar(
              backgroundImage: AssetImage('assets/shoes.jpeg'),
            ),
            title: Text('漂亮的鞋子'),
            subtitle: Text('我是一双来自网络图片的鞋子，侵删！！'),
          ),
          ButtonBar(
            children: [
              ElevatedButton(onPressed: () {
    
    }, child: const Text('YES')),
              ElevatedButton(onPressed: () {
    
    }, child: const Text('NOT')),
            ],
          )
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    
    
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: SingleChildScrollView(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: List.generate(10, (index) => mycard()),
          ),
        ),
      ),
    );
  }
}

效果如图

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总结

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