Flutter布局模型之层叠定位

import 'package:flutter/material.dart';
class LayoutDemo extends StatelessWidget {
 @override
 Widget build(BuildContext context) {
  return new Scaffold(
   appBar: new AppBar(
     : new Text('层叠定位布局'),
   ),
   body:new Center(
    child: new Stack(
     children: <Widget>[
      new Image.network('http://img2.cxtuku.com/00/13/12/s97783873391.jpg'),
      new Positioned(
       left: 35.0,
       right: 35.0,
       top: 45.0,
       child: new Text(
        'Whatever is worth doing is worth doing well. ๑•ิ.•ั๑',
        style: new TextStyle(
         fontSize: 20.0,
         fontFamily: 'serif',
        ),
       ),
      ),
     ]
    ),
   ),
  );
 }
}
void main() {
 runApp(
  new MaterialApp(
    : 'Flutter教程',
   home: new LayoutDemo(),
  ),
 );
}