@expo/vector从子文件夹运行时未加载图标

Question

我正在尝试使用create-react-native-app与世博在一个单一的设置。当我从一个子文件夹app/启动应用程序并导入@expo/vector-icons时，我会发现字体家族丢失了一个错误。

"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，图标就会很好地加载。

我已经配置了我的rn-cli.config.js，以便该应用程序能够对其他依赖项进行编译和运行。我的项目的设置类似于一个monorepo，这样我就可以在回购中拥有多个本地应用程序。

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

我试过几件事都没有用：

• 在子文件夹@expo/vector-icons中安装package.json
• 在"assetExts": ["ttf"]文件中设置app.json。

我的代码(主要来自一个新的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

问题似乎是我有两个不同的世博会模块。摆脱子文件夹中的那个使它正常工作。

Answer 2

我是一个很新的反应-本土的，但我有一个类似的问题，我解决了完全不安装世博图标，并使用它们正常。所以在我的package.json里

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

我导入的字体如下：

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

我敢打赌这不是一个完美的解决方案，但由于世博只是一种让事情变得更简单的工具，我不觉得做一些有用的事情会有什么不好，而不是使用另一种使事情复杂化的工具；

Answer 3

我的世博会版本是“博览会”："^32.0.0“。您所需要做的就是添加您的字体系列，它支持react本机-矢量-图标组，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/找到图标。