@vitrion/react-native-load-fonts

A powerful and flexible library that allows you to load fonts dynamically at runtime via base64 encoded TTF or OTF on your React Native application.

Screenshots

iOS	Android

Features

• Load fonts dynamically at runtime
• Support for TTF and OTF font formats
• Base64 encoded fonts
• Built with TypeScript

Installation

Install the package in your React Native project:

npm install @vitrion/react-native-load-fonts

Usage

To load a font dynamically, you must first have a base64 string of your font file (TTF or OTF):

import { loadFont, loadFonts, loadedFonts } from '@vitrion/react-native-load-fonts';

/* Load a single font */
loadFont('nameOfFont', base64FontString, 'ttf').then(function(name) {
	console.log('Loaded font successfully. Font name is: ', name);
});

/* Load a list of fonts */
loadFonts([{name: 'nameOfFont', data: base64FontString, type: 'ttf'}]).then(function(names) {
	console.log('Loaded all fonts successfully. Font names are: ', names);
});

console.log('Loaded fonts are: ', loadedFonts);
/* Be carefull this is not reactive, */

Font loading using file path

You can download font file to file system and then load it to app without sending base64 to bridge.

import { loadFontFromFile } from '@vitrion/react-native-load-fonts';
import RNFetchBlob from 'rn-fetch-blob'

const fontFilePath = RNFetchBlob.fs.dirs.DocumentDir + "fonts/roboto.ttf";

loadFontFromFile("Roboto",  fontFilePath)
   .then(function(name) {
   	    console.log('Loaded font successfully. Font name is: ', name);
   });

More examples can be found in the example directory of the repository.

Functions

loadFont(name, data, type)

Options

Option	iOS	Android	Info
name	Not used	Used	The name to be assigned to the loaded font. This parameter is used on Android to specify the registered font name (it doesn't work for iOS).
data	Used	Used	The base64 string representation of the font file (TTF or OTF). It can be a data URI or raw base64. If it is raw base64, the type must be specified, but it defaults to TTF if not provided. The data URI should have a mime type of font/ttf or font/otf.
type	Used	Used	(string, optional): Specifies the type of font in the encoded data. It should be either 'ttf' or 'otf'. Defaults to 'ttf'.

The Response

The actual name the font was registered with. Use this name for your fontFamily.

Notes

• Note for iOS: On iOS, it is not possible to explicitly specify the font name when loading fonts dynamically. As a result, both Android and iOS platforms will return the actual registered font name. For Android, this will be whatever you pass in, but for iOS, it will be the name embedded within the font file. To avoid any potential issues, it is recommended to always use the full font name embedded in the font file.

• Ensuring Proper Display: It's important to note that the dynamically loaded font will only be displayed correctly if you provide the appropriate fontWeight and fontStyle values when applying the font. Be sure to refer to the provided example for guidance on using the correct font weight and font style configurations.

Contributing

See the contributing guide to learn how to contribute to the repository and the development workflow.

License

MIT