Tab bar를 만들자 import 'package:flutter/material.dart'; class TabPage extends StatefulWidget { @override _TabPageState createState() => _TabPageState(); } class _TabPageState extends State { int _selectedIndex = 0; List _pages = [ Text('page1'), Text('page2'), Text('page3'), ]; @override Widget build(BuildContext context) { return Scaffold( body: Center(child: _pages[_selectedIndex]), bottomNavigat..