React Native - Expo：fontFamily“SimpleLineIcons”不是系统字体，尚未通过 Font.loadAsync 加载

所以我在 Android 设备/模拟器上收到此错误：

另一方面，在 iOS 上，它编译得很好，并且simple-line-icons都可以正确显示。

我正在运行最新版本的expo。

我的package.json：

{
  "name": "FamScore3",
  "version": "0.1.0",
  "private": true,
  "devDependencies": {
    "react-native-scripts": "1.14.0",
    "jest-expo": "^31.0.0",
    "react-test-renderer": "16.3.1"
  },
  "main": "./node_modules/react-native-scripts/build/bin/crna-entry.js",
  "scripts": {
    "start": "react-native-scripts start",
    "eject": "react-native-scripts eject",
    "android": "react-native-scripts android",
    "ios": "react-native-scripts ios",
    "test": "jest"
  },
  "jest": {
    "preset": "jest-expo"
  },
  "dependencies": {
    "@firebase/auth": "^0.7.6",
    "@firebase/database": "^0.3.6",
    "axios": "^0.18.0",
    "metro-react-native-babel-preset": "^0.45.0",
    "expo": "^31.0.4",
    "firebase": "^5.5.1",
    "react": "16.5.0",
    "react-native": "https://github.com/expo/react-native/archive/sdk-31.0.1.tar.gz",
    "react-native-elements": "^0.19.1",
    "react-native-material-dropdown": "^0.11.1",
    "react-native-router-flux": "^4.0.1",
    "react-redux": "^5.0.7",
    "redux": "^4.0.0",
    "redux-thunk": "^2.3.0"
  }
}

我的应用程序.json：

{
  "expo": {
    "sdkVersion": "31.0.0"
  }
}

我在 App.js 中的 Font.loadAsync 方法在文档中实现：

export default class App extends Component {

  state = {
    fontLoaded: false
  }

  async componentDidMount() {
    try {

      await Font.loadAsync({
        amaticBold: require('./assets/fonts/amaticSC-Bold.ttf'),
        indieFlower: require('./assets/fonts/indieFlower.ttf'),
        'Material Icons': require('@expo/vector-icons/fonts/MaterialIcons.ttf'),
        'simple-line-icons': require('@expo/vector-icons/fonts/SimpleLineIcons.ttf')

      })

      this.setState({ fontLoaded: true })

    } catch (error) {
      console.log('error loading fonts', error);
    }

  }

  render() {
    const store = createStore(reducers, {}, applyMiddleware(ReduxThunk))

    if (!this.state.fontLoaded) {
      return <AppLoading />
    }

    return (
      <Provider store={store}>
        <Router />
      </Provider> 
    )
  }
}

预先非常感谢。任何帮助将非常感激！ 我已经被困了一段时间了。

我遇到了同样的问题，并在这个错误上浪费了很多时间。现在是 2021 年，有更好的方法来做同样的事情，所以不要使用下面的代码

Font.loadAsync({
    'MyAwesomeFont': require('./path/to/MyAwesomeFont.ttf')
})

正确的方法是

import { useFonts } from 'expo-font';
import AppLoading from 'expo-app-loading';

  let [fontsLoaded] = useFonts({
    'open-sans': require('./assets/fonts/OpenSans-Regular.ttf'),
    'open-sans-bold': require('./assets/fonts/OpenSans-Bold.ttf'),
  });
  if (!fontsLoaded) {
    return <AppLoading />;
  }

如果您想进一步解释，请查看官方文档here https://docs.expo.dev/develop/user-interface/fonts/#use-a-custom-font