在颤振中更改BottomNavigationBarItem中图标的显示条件时更新导航菜单

import 'package:flutter/material.dart';

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _selectedIndex = 0;
  bool _showIcon = true;

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

  void _toggleIcon() {
    setState(() {
      _showIcon = !_showIcon;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Bottom Navigation Bar Example'),
      ),
      body: Center(
        child: _showIcon
            ? Icon(Icons.home)
            : Text('Icon hidden'),
      ),
      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,
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _toggleIcon,
        child: Icon(_showIcon ? Icons.visibility_off : Icons.visibility),
      ),
    );
  }
}