Flutter -- iOS -- Align

 1 import 'package:flutter/material.dart';
 2 
 3 class LayoutDemo extends StatelessWidget{
 4   @override
 5   Widget build(BuildContext context) {
 6     // TODO: implement build
 7     return new Scaffold(
 8       appBar: new AppBar(
 9         title: new Text('Align对齐布局'),
10       ),
11       body: new Stack(
12         children: <Widget>[
13           new Align(
14             alignment: new FractionalOffset(0.0, 0.0),
15             child: new Image.asset('images/750-1334-1.png',width: 128.0,height: 128.0),
16           ),
17           new Align(
18             alignment: FractionalOffset(1.0, 0.0),
19             child: new Image.asset('images/750-1334-2.png',width: 128.0,height: 128.0),
20           ),
21           new Align(
22             alignment: FractionalOffset.center,
23             child: new Image.asset('images/750-1334-3.png',width: 128.0,height: 128.0),
24           ),
25           new Align(
26             alignment:  FractionalOffset.bottomLeft,
27             child: new Image.asset('images/750-1334-4.png',width: 128.0,height: 128.0),
28           ),
29           new Align(
30             alignment: FractionalOffset.bottomRight,
31             child: new Image.asset('images/750-1334-5.png',width: 128.0,height: 128.0),
32           ),
33         ],
34       ),
35     );
36   }
37 }
38 
39 void main(){
40   runApp(
41     new MaterialApp(
42       title: 'Align对齐',
43       home: new LayoutDemo(),
44     ),
45   );
46 }