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Add custom fonts to react native (expo) app

edo_begagic profile image Edo Begagic ・2 min read

STEP 1:

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

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

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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.

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

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STEP 2:

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

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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')
});
};

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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

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

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You should see the different custom fonts on your screen:

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

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Discussion

markdown guide
 

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...

 

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

 

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.

 

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 :)

 

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>

);
}

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

});

 

Thanks, very explained post, solved my problems!

 

Nice explanations , Very helpful for me

 

hi this is work for me
useEffect

 

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.