@expo/vector-icons 未从子文件夹加载运行时

Question

我正在尝试在 monorepo 设置中将 create-react-native-app 与 expo 一起使用。当我从子文件夹 app/ 启动应用程序并导入 @expo/vector-icons 时，我收到一条错误消息，指出缺少字体系列。

"fontFamily" 'material' is not a system font and has not been loaded 
through Expo.Font.loadAsync.

如果我在主 src/ 文件夹中启动应用程序，图标加载正常。

我已经配置了我的 rn-cli.config.js，以便该应用程序可以针对其他依赖项正常编译和运行。我的项目设置得像一个 monorepo，所以我可以在 repo 中有多个本机应用程序。

src/
  MainApp.js
  package.json
  app/App.js 
  app/app.json
  app/package.json
  app/rn-cli.config.js
  ...

我尝试了一些方法都无济于事：

在子文件夹 package.json

@expo/vector-icons

在 app.json 文件中设置 "assetExts": ["ttf"]。

我的代码（大部分来自新鲜的creat-react-native-app）：

app/App.js

export { default } from "../MainApp";

app/app.json

{
  "expo": {
    "sdkVersion": "22.0.0",
    "react": "16.0.0-beta.5"
  }
}

app/package.json

{
  "private": true,
  "main": "./node_modules/react-native-scripts/build/bin/crna-entry.js",
  "scripts": {
    "native": "react-native-scripts start"
  },
  "dependencies": {
    "@expo/vector-icons": "^6.2.1",
    "expo": "^22.0.0",
    "react-native": "^0.49.0",
    "react-native-scripts": "1.7.0"
  }
}

app/rn-cli.config.js

const blacklist = require("metro-bundler/src/blacklist");
const path = require("path");

const roots = [process.cwd(), path.resolve(__dirname, "..")];

const config = {
  getProjectRoots: () => roots,

  /**
   * Specify where to look for assets that are referenced using
   * `image!<image_name>`. Asset directories for images referenced using
   * `./<image.extension>` don't require any entry in here.
   */
  getAssetRoots: () => roots,

  /**
   * Returns a regular expression for modules that should be ignored by the
   * packager on a given platform.
   */
  getBlacklistRE: () =>
    blacklist([
      // Ignore the local react-native so that we avoid duplicate modules
      /\/app\/node_modules\/react-native\/.*/
    ])
};

module.exports = config;

package.json

{
  "name": "react-native-app",
  "version": "0.1.0",
  "private": true,
  "devDependencies": {
    "react-native-scripts": "1.7.0"
  },
  "scripts": {
    "native": "cd app && yarn native"
  },
  "dependencies": {
    "@expo/vector-icons": "^6.2.1",
    "expo": "^22.0.0",
    "react": "16.0.0-beta.5",
    "react-native": "^0.49.0"
  }
}

MainApp.js

import React from "react";
import { StyleSheet, Text, View } from "react-native";
import MaterialIcons from "react-native-vector-icons/MaterialIcons";

export default class App extends React.Component {
  render() {
    return (
      <View style={styles.container}>
        <Text>Open up App.js to start working on your app!</Text>
        <Text>Changes you make will automatically reload.</Text>
        <Text>Shake your phone to open the developer menu.</Text>
        <MaterialIcons name="search" color="black" size={32} />
        <MaterialIcons name="location-searching" color="black" size={32} />
      </View>
    );
  }
}
const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: "#fff",
    alignItems: "center",
    justifyContent: "center"
  }
});

Answer 1

我是 react-native 的新手，但我有一个类似的问题，我通过根本不安装 expo 图标并正常使用它们来解决。所以在我的package.json中我有

 "react-native-vector-icons": "^4.4.2",

我导入的字体如下：

import Icon from 'react-native-vector-icons/FontAwesome';

我打赌这不是完美的解决方案，但由于 expo 只是一个让事情变得更简单的工具，我不觉得做一些有用的事情而不是使用另一个工具会使事情复杂化；）

Answer 2

问题似乎出在我有两个不同的 expo 模块。删除子文件夹中的那个使其工作。

Answer 3

我的 expo 版本是 "expo"：“^32.0.0”。您需要做的就是在 react-native-vector-icons 组中添加支持的字体系列，例如 AntDesign、MaterialIcons、FontAwesome 等

import FontAwesomeIcon from 'react-native-vector-icons/FontAwesome';

<FontAwesomeIcon name="circle" size={10} color="#FF6859" style={{ marginLeft: 5 }} />

您还可以从 https://expo.github.io/vector-icons/

中找到图标

@expo/vector-icons 未从子文件夹加载 运行 时

@expo/vector-icons not loaded when running from subfolder

react-native

expo

create-react-native-app

@expo/vector-icons 未从子文件夹加载运行时