如何在颤动中更改BottomNavigationBarItem的splashRadius

import 'package:flutter/material.dart';

class CustomBottomNavigationBarItem extends BottomNavigationBarItem {
  CustomBottomNavigationBarItem({
    required IconData icon,
    required String label,
    double splashRadius = 24.0,
  }) : super(
          icon: Icon(icon),
          label: label,
          splashRadius: splashRadius,
        );
}

int _currentIndex = 0;

List<CustomBottomNavigationBarItem> _bottomNavigationBarItems = [
  CustomBottomNavigationBarItem(
    icon: Icons.home,
    label: 'Home',
    splashRadius: 16.0, // 自定义的splashRadius值
  ),
  CustomBottomNavigationBarItem(
    icon: Icons.settings,
    label: 'Settings',
    splashRadius: 16.0, // 自定义的splashRadius值
  ),
];

@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(
      title: Text('BottomNavigationBar Example'),
    ),
    body: Center(
      child: Text('Current Index: $_currentIndex'),
    ),
    bottomNavigationBar: BottomNavigationBar(
      currentIndex: _currentIndex,
      onTap: (int index) {
        setState(() {
          _currentIndex = index;
        });
      },
      items: _bottomNavigationBarItems,
    ),
  );
}