DEV Community 👩‍💻👨‍💻

Edo Begagic
Edo Begagic

Posted on

Add custom fonts to react native (expo) app

STEP 1:

1. In your assets folder (or anywhere you prefer) create a new 'fonts' folder.

Alt Text

2. Go to https://fonts.google.com/ (or any other fonts library) and download your preferred font or multiple fonts.

Alt Text

3. Extract the TrueTypeFont (.ttf) file to your fonts folder. (If you are using VSCode text editor, you can drag the extracted files directly into the editor.

Alt Text

4. I added three different fonts: 'Roboto-Bold.ttf', 'Roboto-Italic.ttf' and 'Roboto-Regular.ttf'.

Alt Text

STEP 2:

In your project root, using the command prompt, install expo-font with following command: expo install expo-font

Alt Text

STEP 3:

1. In your App.js import following:

import * as Font from 'expo-font';
import { AppLoading } from 'expo';

2. Write following function

const fetchFonts = () => {
return Font.loadAsync({
'roboto-bold': require('./assets/fonts/Roboto-Bold.ttf'),
'roboto-italic': require('./assets/fonts/Roboto-Italic.ttf'),
'roboto-regular': require('./assets/fonts/Roboto-Regular.ttf')
});
};

Alt Text

I am using the 'roboto-bold', 'roboto-italic' and 'roboto-regular' fonts. You will use the name of the font you downloaded.

3.Add state

Alt Text

4. Add if statement to check if the fonts loaded and style the text components to check if your custom fonts are working.

Alt Text

You should see the different custom fonts on your screen:

Alt Text

If you have any additional questions or suggestions, feel free to leave a comment! :)

Top comments (16)

Collapse
 
emma___09 profile image
Emma • Edited on

Hey, thanks for you article !

However I still have the same error ("fontFamily : 'OpenSans-SemiBold" is not a system font and has not been loaded through Font.loadAsync")... I don't understand why, I have checked and re-checked my code but it still doesn't work. Can you help me to figure it out ?

screen of my code:
drive.google.com/file/d/1filV2ZK9Y...

Collapse
 
adelpro profile image
adelpro

Im using this method with Expo react native:
first install the relative npm packages, in my case im using "tajawal" font

npm i @expo-google-fonts/tajawal
Enter fullscreen mode Exit fullscreen mode

in App.js:

let [fontsLoaded] = useFonts({
    Tajawal_300Light,
    Tajawal_400Regular,
    Tajawal_500Medium,
    Tajawal_800ExtraBold,
  });

  if (!fontsLoaded) {
    return <AppLoading />;
  }
Enter fullscreen mode Exit fullscreen mode

Then

const TajawalFontFamily = StyleSheet.create({
  ExtraBold: {
    fontFamily: "Tajawal_800ExtraBold",
  },
  Light: {
    fontFamily: "Tajawal_300Light",
  },
  Regular: {
    fontFamily: "Tajawal_400Regular",
  },
  Medium: {
    fontFamily: "Tajawal_500Medium",
  },
});
Enter fullscreen mode Exit fullscreen mode

then i pass (TajawalFontFamily ) as prop to my component

<Home font:{TajawalFontFamily }
Enter fullscreen mode Exit fullscreen mode

in Home component:

<Text style={[styles.headerText, font.ExtraBold]}>الباحث في الحديث</Text>
Enter fullscreen mode Exit fullscreen mode
Collapse
 
katnel20 profile image
Katie Nelson

Hi Emma, I'm Katie, welcome to the DEV community!
I see you are new here and already asking questions which is great!
I'm sure you'll find lots of help and support on DEV for all your coding needs.

Collapse
 
alexparton profile image
AlexParton

Me too, same stetps and same error. Did you solve it Emma?
thanks

Collapse
 
adelpro profile image
adelpro

Im using this method with Expo react native:
first install the relative npm packages, in my case im using "tajawal" font

npm i @expo-google-fonts/tajawal
Enter fullscreen mode Exit fullscreen mode

in App.js:

let [fontsLoaded] = useFonts({
    Tajawal_300Light,
    Tajawal_400Regular,
    Tajawal_500Medium,
    Tajawal_800ExtraBold,
  });

  if (!fontsLoaded) {
    return <AppLoading />;
  }
Enter fullscreen mode Exit fullscreen mode

Then

const TajawalFontFamily = StyleSheet.create({
  ExtraBold: {
    fontFamily: "Tajawal_800ExtraBold",
  },
  Light: {
    fontFamily: "Tajawal_300Light",
  },
  Regular: {
    fontFamily: "Tajawal_400Regular",
  },
  Medium: {
    fontFamily: "Tajawal_500Medium",
  },
});
Enter fullscreen mode Exit fullscreen mode

then i pass (TajawalFontFamily ) as prop to my component

<Home font:{TajawalFontFamily }
Enter fullscreen mode Exit fullscreen mode

in Home component:

<Text style={[styles.headerText, font.ExtraBold]}>الباحث في الحديث</Text>
Enter fullscreen mode Exit fullscreen mode
Collapse
 
edo_begagic profile image
Edo Begagic

Dear Emma & Alex,

Sorry for the late reply. You can download a version from my github, compare it with your code and try for yourself. :)

github.com/edobegagic/loadfont

Hope this helps :)

Collapse
 
hassanrahimi profile image
hassanrahimi • Edited on

hi , this is work correctly , useEffect

import React, { useState, useEffect } from 'react';
import { StyleSheet, Text, View } from 'react-native';
import TextTraning from './Component/L001_Text';
import * as font from 'expo-font';
import { AppLoading } from 'expo-font';

export default function App() {

useEffect(() => {
font.loadAsync({
'nazanin': require('./assets/fonts/BNazanin.ttf'),
'b-titr': require('./assets/fonts/BTitrBd.ttf'),
'yekan': require('./assets/fonts/BYekan.ttf'),
'zar': require('./assets/fonts/BZar.ttf'),
'roboto-bold': require('./assets/fonts/Roboto-Bold.ttf'),
'roboto-italic': require('./assets/fonts/Roboto-Italic.ttf'),
'roboto-regular': require('./assets/fonts/Roboto-Black.ttf')
})
},[])
return (

    <Text style={}>Hiiiiiiiiiiii</Text>{fontFamily:'roboto-italic'}
    <Text style={fontFamily:'b-titr'}}>سلام به همه دوستان </Text>

</View>
Enter fullscreen mode Exit fullscreen mode

);
}

const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#aaa',
alignItems: 'center',
justifyContent: 'center',
}

});

Collapse
 
mohamamddev profile image
mohamamddev

thank you

Collapse
 
hik8hik profile image
Hik Hik

This was a cool shortcut. Thanks to the post owner

Collapse
 
daltonfelipe profile image
Dalton Felipe Silva Varão

Thanks, very explained post, solved my problems!

Collapse
 
hassanrahimi profile image
hassanrahimi • Edited on

hi this is work for me
useEffect

Collapse
 
mohamamddev profile image
mohamamddev

Great, thanks for your content.

Collapse
 
mps000 profile image
mps000

Nice explanations , Very helpful for me

Collapse
 
bamoohaa profile image
Bashir Hamza

Thank you for this. It helped a great deal.

So there is no way to just have a global font that every tag will automatically use.

Collapse
 
burakodabas profile image
Burak Odabaş

I found this;
npmjs.com/package/react-native-glo...

However, not font changes in globally. I think you should put fontFamily for every tags.

Collapse
 
devahmedbakr profile image
AhmedBakr

Hi , Emma & Alex

This solution worked for me
drive.google.com/file/d/1u0HzPNILU...

Top Heroku Alternatives (For Free!)

Recently Heroku shut down free Heroku Dynos, free Heroku Postgres, and free Heroku Data for Redis on November 28th, 2022. So Meshv Patel put together some free alternatives in this classic DEV post.