TypeError：Font.isLoaded不是函数。 @ expo / vector-icons

Question

使用@ expo / vector-icons时出现此错误。我该如何解决这个问题？

我尝试运行npm install并升级博览会，但仍然出现错误。

import React, { Component } from 'react';
import { ScrollView, StatusBar } from 'react-native';
import { Ionicons } from '@expo/vector-icons';
import { ListItem, Separator } from '../components/List';

const ICON_COLOR = '#868686';
const ICON_SIZE = 23;

class Options extends Component {
  handlePressThemes = () => {
   console.log('press themes');
};

handlePressSite = () => {
   console.log('press site');
};

render() {
  return (
    <ScrollView>
    <StatusBar translucent={false} barStyle="default" />
    <ListItem
      text="Themes"
      onPress={this.handlePressThemes}
      customIcon={<Ionicons name="arrow-right" size={ICON_SIZE} color={ICON_COLOR} />}
    />
    <Separator />
    <ListItem
      text="Fixer.io"
      onPress={this.handlePressSite}
      customIcon={<Ionicons name="link" size={ICON_SIZE} color={ICON_COLOR} />}
    />
    <Separator />
  </ScrollView>
);
}
}
export default Options;