Flutter -- iOS -- Align

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('Align对齐布局'),
      ),
      body: new Stack(
        children: <Widget>[
          new Align(
            alignment: new FractionalOffset(0.0, 0.0),
            child: new Image.asset('images/750-1334-1.png',width: 128.0,height: 128.0),
          ),
          new Align(
            alignment: FractionalOffset(1.0, 0.0),
            child: new Image.asset('images/750-1334-2.png',width: 128.0,height: 128.0),
          ),
          new Align(
            alignment: FractionalOffset.center,
            child: new Image.asset('images/750-1334-3.png',width: 128.0,height: 128.0),
          ),
          new Align(
            alignment:  FractionalOffset.bottomLeft,
            child: new Image.asset('images/750-1334-4.png',width: 128.0,height: 128.0),
          ),
          new Align(
            alignment: FractionalOffset.bottomRight,
            child: new Image.asset('images/750-1334-5.png',width: 128.0,height: 128.0),
          ),
        ],
      ),
    );
  }
}

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