Flutter之Flex

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

class FlexWidget extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    // TODO: implement createState
    return _FlexWidgetState();
  }
}

class _FlexWidgetState extends State<FlexWidget> {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text('FLex'),
      ),
      body: Column(
        children: <Widget>[
          Container(
            height: 400.0,
            child: Flex(
              direction: Axis.vertical,
              children: <Widget>[
                Expanded(
                  flex: 1,
                  child: Container(
                    color: Colors.red,
                  ),
                ),
                Expanded(
                  flex: 2,
                  child: Container(
                    color: Colors.yellow,
                  ),
                ),
              ],
            ),
          ),
          Container(
            height: 120.0,
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: <Widget>[
                Expanded(
                  flex: 2,
                  child: Container(
                    color: Colors.blue,
                  ),
                ),
                Expanded(
                  flex: 1,
                  child: Container(
                    color: Colors.red,
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}