【Flutter/Dart】Tabの実装

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyTabView(),
    );
  }
}

class MyTabView extends StatefulWidget {
  @override
  _MyTabViewState createState() => _MyTabViewState();
}

class _MyTabViewState extends State<MyTabView>
    with SingleTickerProviderStateMixin {
  late TabController _tabController;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 4, vsync: this);
  }

  @override
  void dispose() {
    _tabController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Tab View Demo'),
        bottom: TabBar(
          controller: _tabController,
          tabs: [
            Tab(text: 'Home'),
            Tab(text: 'Posts'),
            Tab(text: 'Notifications'),
            Tab(text: 'Settings'),
          ],
        ),
      ),
      body: TabBarView(
        controller: _tabController,
        children: [
          HomeTab(),
          PostsTab(),
          NotificationsTab(),
          SettingsTab(),
        ],
      ),
    );
  }
}

class HomeTab extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('Home Tab Content'),
    );
  }
}

class PostsTab extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('Posts Tab Content'),
    );
  }
}

class NotificationsTab extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('Notifications Tab Content'),
    );
  }
}

class SettingsTab extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('Settings Tab Content'),
    );
  }
}