import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  int _currentIndex = 0;

  final List<Widget> _pages = [
    FirstPage(),
    SecondPage(),
    ThirdPage(),
  ];

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('페이지 전환 예제'),
        ),
        body: IndexedStack(
          index: _currentIndex,
          children: _pages,
        ),
        bottomNavigationBar: BottomNavigationBar(
          currentIndex: _currentIndex,
          onTap: (int newIndex) {
            _currentIndex = newIndex;
          },
          items: [
            BottomNavigationBarItem(
              icon: Icon(Icons.home),
              label: '첫 번째 페이지',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.search),
              label: '두 번째 페이지',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.settings),
              label: '세 번째 페이지',
            ),
          ],
        ),
      ),
    );
  }
}

class FirstPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('첫 번째 페이지'),
    );
  }
}

class SecondPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('두 번째 페이지'),
    );
  }
}

class ThirdPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('세 번째 페이지'),
    );
  }
}