如何在 Flutter 的 IconData 中插入一个变量？

Question

我想显示一个社交媒体的图标。

String socialMedia = 'facebook';

然后在我的构建函数中，我想在我的图标小部件中使用这个变量

Icon(FontAwesomeIcons.socialMedia)

如何插入这个变量？可能吗？如果我可以像这样使用变量，这对我来说会变得很容易。因为现在我可以使用变量来相应地更改图标了。

Answer 1

您可以复制粘贴运行下面的完整代码
您可以使用包 https://pub.dev/packages/icons_helper
您可以使用 getIconUsingPrefix，对于 FontAwesome 图标，您可以在字符串前加上 fa.

代码片段

Icon(getIconUsingPrefix(name: 'fa.fiveHundredPx'),
                color: Theme.of(context).backgroundColor, size: 128.0),
Icon(getIconUsingPrefix(name: 'fa.facebook'),
    color: Theme.of(context).backgroundColor, size: 128.0),
Icon(getIconUsingPrefix(name: 'add'),
    color: Theme.of(context).backgroundColor, size: 128.0),

工作演示

完整代码

import 'package:flutter/material.dart';
import 'package:icons_helper/icons_helper.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {  
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(       
        primarySwatch: Colors.blue,       
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {     
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {    
    return Scaffold(
      appBar: AppBar(       
        title: Text(widget.title),
      ),
      body: Center(        
        child: Column(          
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Icon(getIconUsingPrefix(name: 'fa.fiveHundredPx'),
                color: Theme.of(context).backgroundColor, size: 128.0),
            Icon(getIconUsingPrefix(name: 'fa.facebook'),
                color: Theme.of(context).backgroundColor, size: 128.0),
            Icon(getIconUsingPrefix(name: 'add'),
                color: Theme.of(context).backgroundColor, size: 128.0),
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}

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