IconData未作为参数传递到类实例化中

Question

我定义了以下类：

import 'package:flutter/material.dart';
class ItemHiddenMenu extends StatelessWidget {
/// name of the menu item
final String name;
/// callback to recibe action click in item
final Function onTap;
final Color colorLineSelected;
/// Base style of the text-item.
final TextStyle baseStyle;
/// style to apply to text when item is selected
final TextStyle selectedStyle;
final bool selected;
final IconData icon;
ItemHiddenMenu({
Key key,
this.name,
this.selected = false,
this.onTap,
this.colorLineSelected = Colors.blue,
this.baseStyle,
this.selectedStyle,
this.icon,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Container(
width: double.infinity,
margin: EdgeInsets.only(bottom: 15.0),
child: InkWell(
onTap: onTap,
child: Row(
children: <Widget>[
ClipRRect(
borderRadius: BorderRadius.only(
topRight: Radius.circular(4.0),
bottomRight: Radius.circular(4.0)),
child: Container(
height: 40.0,
color: selected ? colorLineSelected : Colors.transparent,
width: 5.0,
),
),
Expanded(
child: Container(
margin: EdgeInsets.only(left: 20.0),
child: Row(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Icon(icon),
SizedBox(
width: 15,
),
Text(
name,
style: (this.baseStyle ??
TextStyle(color: Colors.grey, fontSize: 25.0))
.merge(this.selected
? this.selectedStyle ??
TextStyle(color: Colors.white)
: null),
),
],
),
),
),
],
),
),
);
}
}

我试图将IconData作为命名参数icon传递，如下所示：

new ItemHiddenMenu(
icon: Icons.dashboard,
name: "Investments by category",
baseStyle:
TextStyle(color: Colors.white.withOpacity(0.8), fontSize: 20.0),
colorLineSelected: Colors.teal,
)

代码运行良好，但图标没有显示。出于测试目的，我试图在类本身内部定义icon，它可以工作，但我的所有实例当然都会有相同的图标，这不是我想要的。

我在这里错过了什么？

Answer 1

我通过传递IconData尝试了您的代码。它有效，图标可见。

您可以尝试Passing和Icon小部件，而不是IconData