PopupMenuButton控件即弹出菜单控件,点击控件会出现菜单。
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import 'package:flutter/material.dart' ; class MenusDemo extends StatefulWidget { @override _MenusDemoState createState() => new _MenusDemoState(); } class _MenusDemoState extends State<MenusDemo> { String _bodyStr = '显示菜单的点击' ; @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar( title: new Text( '菜单演示' ), actions: <Widget> [ new PopupMenuButton<String>( onSelected: (String value) { setState(() { _bodyStr = value; }); }, itemBuilder: (BuildContext context) => <PopupMenuItem<String>>[ new PopupMenuItem<String>( value: '选项一的值' , child: new Text( '选项一' ) ), new PopupMenuItem<String>( value: '选项二的值' , child: new Text( '选项二' ) ) ] ) ] ), body: new Center( child: new Text(_bodyStr) ) ); } } void main() { runApp( new MaterialApp( title: 'Flutter教程' , home: new MenusDemo(), )); } |
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原文链接:https://blog.csdn.net/hekaiyou/article/details/53897967