Flutter 如何使用字符串访问属性或方法？

我使用flattericon.com创建了自定义字体图标，如下所示：

// fa_pro_light_icons.dart
import 'package:flutter/widgets.dart';

class FaProLight {
  FaProLight._();

  static const _kFontFam = 'FaProLight';

  static const IconData cash_register = const IconData(0xe800, fontFamily: _kFontFam);
  static const IconData chart_pie = const IconData(0xe801, fontFamily: _kFontFam);
}

class MyModel {
  final String id;
  final String icon;

  const MyModel({ this.id, this.icon });
}

Widget _listItemBuilder(BuildContext context, int index) {
  const items = SAY_SOME_DUMMY_DATA;
  return ListItem(
    avatar: CircleAvatar(
      child: Icon(FaProLight.cash_register) // this work - no problem
      child: Icon(FaProLight.[items[index].icon]) // But, How to make this work?
    ),
  );
}

我从服务器上以字符串的形式获取图标名

// dummy_data.dart
const SAY_SOME_DUMMY_DATA = const [
  MyModel(id: '1', icon: 'cash_register'),
  MyModel(id: '1', icon: 'chart_pie'),
];

我的模型如下所示：

// fa_pro_light_icons.dart
import 'package:flutter/widgets.dart';

class FaProLight {
  FaProLight._();

  static const _kFontFam = 'FaProLight';

  static const IconData cash_register = const IconData(0xe800, fontFamily: _kFontFam);
  static const IconData chart_pie = const IconData(0xe801, fontFamily: _kFontFam);
}

class MyModel {
  final String id;
  final String icon;

  const MyModel({ this.id, this.icon });
}

Widget _listItemBuilder(BuildContext context, int index) {
  const items = SAY_SOME_DUMMY_DATA;
  return ListItem(
    avatar: CircleAvatar(
      child: Icon(FaProLight.cash_register) // this work - no problem
      child: Icon(FaProLight.[items[index].icon]) // But, How to make this work?
    ),
  );
}

我的列表生成器如下所示：

// fa_pro_light_icons.dart
import 'package:flutter/widgets.dart';

class FaProLight {
  FaProLight._();

  static const _kFontFam = 'FaProLight';

  static const IconData cash_register = const IconData(0xe800, fontFamily: _kFontFam);
  static const IconData chart_pie = const IconData(0xe801, fontFamily: _kFontFam);
}

class MyModel {
  final String id;
  final String icon;

  const MyModel({ this.id, this.icon });
}

Widget _listItemBuilder(BuildContext context, int index) {
  const items = SAY_SOME_DUMMY_DATA;
  return ListItem(
    avatar: CircleAvatar(
      child: Icon(FaProLight.cash_register) // this work - no problem
      child: Icon(FaProLight.[items[index].icon]) // But, How to make this work?
    ),
  );
}

所以，我的问题是：

---

如何使这项工作

FaProLight.[items[index].icon]

如上所述？

您不能使用Dart中的字符串访问成员，但是，您可以简单地将成员转换为地图：

class-FaProLight{
灯火通明；
静态常数_kFontFam='FaProLight'；
静态常量映射图标={
“收银机”：iConnda（0xe800，fontFamily:_kFontFam），
“图表”：Iconda（0xe801，fontFamily:_kFontFam），
};
}

现在，您可以按如下方式访问您的图标：

// fa_pro_light_icons.dart
import 'package:flutter/widgets.dart';

class FaProLight {
  FaProLight._();

  static const _kFontFam = 'FaProLight';

  static const IconData cash_register = const IconData(0xe800, fontFamily: _kFontFam);
  static const IconData chart_pie = const IconData(0xe801, fontFamily: _kFontFam);
}

class MyModel {
  final String id;
  final String icon;

  const MyModel({ this.id, this.icon });
}

Widget _listItemBuilder(BuildContext context, int index) {
  const items = SAY_SOME_DUMMY_DATA;
  return ListItem(
    avatar: CircleAvatar(
      child: Icon(FaProLight.cash_register) // this work - no problem
      child: Icon(FaProLight.[items[index].icon]) // But, How to make this work?
    ),
  );
}

CircleAvatar(
子项：图标（FaProLight.icons[items[index].Icon]），
)

谢谢你的帮助，这是我最想念Javascript的时候：）另外，通过将它转换为

Map

我将错过IDE中完整的好代码（vs code）：@Syed我感觉到你了。对于代码完成，您只需保留以前的变量，然后在映射中引用它们：

'chart\u pie'：chart\u pie

，这样您就可以在代码中为要访问的变量声明变量。@Syed您能从注释中进一步解释您的答案吗？