向BottomNavigationBarItem颤动添加回调函数

import 'package:flutter/material.dart';

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  int _selectedIndex = 0;

  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
    });

    // 在这里可以执行特定的操作，例如切换页面或执行其他相关操作
    // ...
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('BottomNavigationBar Example'),
        ),
        body: Center(
          child: Text('Selected Index: $_selectedIndex'),
        ),
        bottomNavigationBar: BottomNavigationBar(
          items: const <BottomNavigationBarItem>[
            BottomNavigationBarItem(
              icon: Icon(Icons.home),
              label: 'Home',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.business),
              label: 'Business',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.school),
              label: 'School',
            ),
          ],
          currentIndex: _selectedIndex,
          onTap: _onItemTapped, // 添加回调函数
        ),
      ),
    );
  }
}