Loading font native-base error

This new code for expo SDK 35 which was modified from @akhil xavier 's answer

First install expo-font

expo install 'expo-font'

here is the App.js

import React from "react";
import * as Font from "expo-font";
import { ActivityIndicator } from "react-native";
import { Root } from "native-base";

export default class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = { loading: true };
  }

  async componentWillMount() {
    await Font.loadAsync({
      Roboto: require("native-base/Fonts/Roboto.ttf"),
      Roboto_medium: require("native-base/Fonts/Roboto_medium.ttf"),
      Ionicons: require("@expo/vector-icons/build/vendor/react-native-vector-icons/Fonts/Ionicons.ttf"),
    });
    this.setState({ loading: false });
  }

  render() {
    if (this.state.loading) {
      return <ActivityIndicator />;
    }
    return (
      <Root>
       <RootPage /> // starter component (i.e. nav)
      </Root>
    );
  }
}

you need to wait till the fonts get loaded. You can do something like this

import React from "react";
import { StatusBar } from "react-native";
import { Container, Button, text, ListItem, Text } from "native-base";
import Expo from "expo";

export default class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = { loading: true };
  }

  async componentWillMount() {
    await Expo.Font.loadAsync({
      Roboto: require("native-base/Fonts/Roboto.ttf"),
      Roboto_medium: require("native-base/Fonts/Roboto_medium.ttf"),
      Ionicons: require("@expo/vector-icons/fonts/Ionicons.ttf"),
    });
    this.setState({ loading: false });
  }

  render() {
    if (this.state.loading) {
      return <Expo.AppLoading />;
    }
    return (
      <Container>
        <StatusBar hidden={true} />

        <Button>
          <Text>Button</Text>
        </Button>

        <ListItem />
      </Container>
    );
  }
}

The solution that works for me is below. The error I had was that I imported Font as (Fonts) but while calling it failed to notice the 's'. Fixed it by making sure the import name is similar to what you call the loadAsync to. You need to have 'expo-font' installed in your project for it to work

import React from "react";
import * as Font from "expo-font";
import { AppLoading } from "expo";
import MealsNavigator from "./navigation/MealsNavigator";


const fetchFonts = () => {
  return Font.loadAsync({
    "open-sans": require("./assets/fonts/OpenSans-Regular.ttf"),
    "open-sans-bold": require("./assets/fonts/OpenSans-Bold.ttf")
  });
};

export default function App() {
  const [fontLoaded, setFontLoaded] = useState(false);
  if (!fontLoaded) {
    return (
      <AppLoading
        startAsync={fetchFonts}
        onFinish={() => setFontLoaded(true)}
        onError={err => console.log(err)}
      />
    );
  }
  return <MealsNavigator />;
}