如何在Flutter中实现底部导航抽屉

import 'package:flutter/material.dart';

class BottomNavigationDrawer extends StatefulWidget {
  @override
  _BottomNavigationDrawerState createState() => _BottomNavigationDrawerState();
}

class _BottomNavigationDrawerState extends State<BottomNavigationDrawer> {
  int _currentIndex = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('底部导航抽屉示例'),
      ),
      body: Center(
        child: Text('当前选中的页面是第 $_currentIndex 个'),
      ),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _currentIndex,
        onTap: (int index) {
          setState(() {
            _currentIndex = index;
          });
        },
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: '首页',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.search),
            label: '搜索',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.person),
            label: '个人',
          ),
        ],
      ),
      drawer: Drawer(
        child: ListView(
          padding: EdgeInsets.zero,
          children: [
            DrawerHeader(
              decoration: BoxDecoration(
                color: Colors.blue,
              ),
              child: Text(
                '抽屉头部',
                style: TextStyle(
                  color: Colors.white,
                  fontSize: 24,
                ),
              ),
            ),
            ListTile(
              leading: Icon(Icons.settings),
              title: Text('设置'),
              onTap: () {
                // 处理点击事件
              },
            ),
            ListTile(
              leading: Icon(Icons.help),
              title: Text('帮助'),
              onTap: () {
                // 处理点击事件
              },
            ),
          ],
        ),
      ),
    );
  }
}

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