如何在Flutter中使用选项卡式窗口小部件？

import 'package:flutter/material.dart';

class MyTabbedWidget extends StatefulWidget {
  @override
  _MyTabbedWidgetState createState() => _MyTabbedWidgetState();
}

class _MyTabbedWidgetState extends State<MyTabbedWidget> with SingleTickerProviderStateMixin {
  TabController _tabController;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 3, vsync: this); // 设置选项卡的数量
  }

  @override
  void dispose() {
    _tabController.dispose(); // 释放资源
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Tabbed Widget'),
        bottom: TabBar(
          controller: _tabController,
          tabs: [
            Tab(icon: Icon(Icons.home), text: 'Home'),
            Tab(icon: Icon(Icons.business), text: 'Business'),
            Tab(icon: Icon(Icons.school), text: 'School'),
          ],
        ),
      ),
      body: TabBarView(
        controller: _tabController,
        children: [
          // 每个选项卡对应的内容
          Center(child: Text('Home')),
          Center(child: Text('Business')),
          Center(child: Text('School')),
        ],
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: MyTabbedWidget(),
  ));
}