在反应中动态检索图像？

如何解决在反应中动态检索图像？

我在弄清楚如何在 react 中动态导入图像时遇到了一些问题。经过一番研究，我了解到需要 require() 函数，所以这是我迄今为止尝试过的：

<img src={require(`../../assets/${companyName}.png`)}></img>

但我的网页仍然生成空白图像。在这方面我可以收到任何指导或提示吗？我正在使用 create-react-app 构建作为参考。非常感谢！

解决方法

您似乎要将图像导入为：

    import 'dart:io';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

enum FlashStatus {
  auto,on,off,}

final flashStatusProvider = StateProvider((ref) => FlashStatus.auto);

class FlashScreen extends StatefulWidget {
  @override
  _FlashScreenState createState() => _FlashScreenState();
}

class _FlashScreenState extends State<FlashScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: ToolBar(),);
  }
}

class ToolBar extends StatelessWidget with PreferredSizeWidget {
  @override
  final Size preferredSize;

  ToolBar({
    Key key,})  : preferredSize = Size.fromHeight(50.0),super(key: key);

  IconData get flashIconAuto =>
      Platform.isAndroid ? Icons.flash_auto : CupertinoIcons.bolt_badge_a;

  IconData get flashIconOn =>
      Platform.isAndroid ? Icons.flash_on : CupertinoIcons.bolt_fill;

  IconData get flashIconOff =>
      Platform.isAndroid ? Icons.flash_off : CupertinoIcons.bolt_slash;

  @override
  Widget build(BuildContext context) {
    return AppBar(
      automaticallyImplyLeading: false,backgroundColor: Colors.transparent,leading: Consumer(builder: (context,ScopedReader watch,child) {
        final status = watch(flashStatusProvider);
        print(status.state);
        switch (status.state) {
          case FlashStatus.on:
            return IconButton(
              icon: Icon(flashIconOff),tooltip: 'Turn off camera flash',onPressed: () =>
                  context.read(flashStatusProvider).state = FlashStatus.off,);
            break;
          case FlashStatus.off:
            return IconButton(
                icon: Icon(flashIconOn),tooltip: 'Turn on camera flash',onPressed: () =>
                    context.read(flashStatusProvider).state = FlashStatus.on);
            break;
          default:
            return IconButton(
                icon: Icon(flashIconOn),onPressed: () =>
                    context.read(flashStatusProvider).state = FlashStatus.on);
        }
      }),);
  }
}

尝试像这样添加它：

import companyName from '../../assets/companyName.png'