Flutter -- iOS -- FittedBox

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('FittedBox缩放布局示例'),
      ),
      body: new Container(
        color: Colors.grey,
        width: 250.0,
        height: 250.0,
        child: new FittedBox(
          fit: BoxFit.fill,// 更改此处属性 scalDown/fitHeight/cover/fitWidth/none/fill/contain
          alignment: Alignment.topLeft,
          child: new Container(
            color: Colors.deepOrange,
            child: new Text('缩放布局'),
          ),
        ),
      ),
    );
  }
}

void main(){
  runApp(
    new MaterialApp(
      title: 'FittedBox缩放布局',
      home: new LayoutDemo(),
    ),
  );
}