1 import ‘package:flutter/material.dart‘;
 2 
 3 void main() => runApp(
 4   new MaterialApp(
 5     title: ‘Center居中布局‘,
 6     home: new LayoutDemo(),
 7   ),
 8 );
 9 
10 class LayoutDemo extends StatelessWidget{
11   @override
12   Widget build(BuildContext context) {
13     // TODO: implement build
14     return  new Scaffold(
15       appBar: new AppBar(
16         title: new Text(‘iOS 导航栏‘),
17       ),
18       body: new Center(
19         child: new Text(
20           ‘Hello Flutter‘,
21           style: TextStyle(
22             fontSize: 36.0,
23           ),
24         ),
25       ),
26     );
27   }
28 }