flutter Offstage控制是否显示组件示例

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    final apptitle = "Offstage控制是否显示组件示例";
    return MaterialApp(
      title: apptitle,
      home: MyHomePage(
        title: apptitle,
      ),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  final String title;

  MyHomePage({Key key, this.title}) : super(key: key);

  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  bool Offstagex = true;

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Offstage(
          offstage: Offstagex,
          child: Text(
            '天王盖地虎',
            style: TextStyle(fontSize: 36),
          ),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          setState(() {
            Offstagex = !Offstagex;
          });
        },
        tooltip: "显示隐藏",
        child: Icon(Icons.flip),
      ),
    );
  }
}