Flutter -- iOS -- Row

import 'package:flutter/material.dart';

class LayoutDemo extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('水平布局示例'),
      ),
      body: new Row(
        children: <Widget>[
          new Expanded(child: new Text('左侧文本',textAlign: TextAlign.center)),
          new Expanded(child: new Text('中间文本',textAlign: TextAlign.center)),
          new Expanded(child: new FittedBox(fit: BoxFit.contain,child: const FlutterLogo()))
        ],
      ),
    );
  }
}

void main(){
  runApp(
    new MaterialApp(
      title: '水平对齐',
      home: new LayoutDemo(),
    ),
  );
}