Flutter 容器(5) - SizedBox

SizedBox: 两种用法：一是可用来设置两个widget之间的间距，二是可以用来限制子组件的大小。

import 'package:flutter/material.dart';
class AuthList extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('代码测试'),
        centerTitle: true,
      ),
      body: Row(children: <Widget>[
        SizedBox(
          width: 150.0,
          height: 150.0,
          child: Container(
            margin: EdgeInsets.all(20.0),
            width: 200.0,
            height: 200.0,
            color: Colors.blue,
          ),
        ),
        SizedBox(
          width: 100.0,
          height: 100.0,
          child: Container(
            margin: EdgeInsets.all(20.0),
            width: 200.0,
            height: 200.0,
            color: Colors.yellow,
          ),
        ),
        SizedBox(
          width: 100.0,
          height: 100.0,
          child: Container(
            margin: EdgeInsets.all(20.0),
            width: 200.0,
            height: 200.0,
            color: Colors.red,
          ),
        )
      ]) ,
    );
  }
}