flutter_BottomNavigationBar_Context：找到此候选项，但参数不匹配

Question

使用BottomNavigationBar我得到以下错误：上下文：找到了此候选者，但参数不匹配。const BottomNavigationBarItem(｛

我的代码是下一个：

bottomNavigationBar: BottomNavigationBar(
items:[
BottomNavigationBarItem(
// ignore: deprecated_member_use
title:Text('Hola'),
icon:  (Icons.calendar_today),
),
BottomNavigationBarItem(
icon (Icons.pie_chart_outlined),
title:Text('hola'),
),
BottomNavigationBarItem(
icon (Icons.supervised_user_circle),
title:Text('hola'),
),
],
),

Answer 1

在BottomNavigationBar中没有图标的参数名称

像这样：BottomNavigationBarItem(icon: Icon(Icons.ac_unit), label: 'my label')

Answer 2

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,
selectedItemColor: Colors.amber[800],
onTap: _onItemTapped,
),

Answer 3

谢谢大家。它有两个缺陷：

1. ；标题"；参数已过时
2. 我忘了放图标类，这是一个很大的错误

谢谢