react-native-custom-fonts

Use dynamic fonts specified via a network location, instead of managing them in your native builds!

🚀 Getting Started

>=0.60.0

yarn add react-native-custom-fonts # or npm install --save react-native-custom-fonts

Then rebuild your app. On iOS, be sure to pod install your cocoapods in your app's /ios directory.

<=0.59.X

Using yarn:

yarn add react-native-custom-fonts
react-native link react-native-custom-fonts

Breaking Changes

<1.2.0
- We've added a bunch of stability improvements, and migrated to a new Hooks-based API.
- The fontFaces array prop has been turned into a fontFaces object, whose keys are the names of font styles you'd like to reference in your app.
- To use a fontFace, you must specify the name in a call to useCustomFont(name:String).

✍️ Example

Please check out the example project for a full demonstration. Just cd into the directory, use npm or yarn to install the dependencies, then execute the app using the following:

react-native run-android # run on android
react-native run-ios     # run on ios

Simple

import React from "react";
import PropTypes from "prop-types";
import {View, Text} from "react-native";
import CustomFontsProvider, {useCustomFont} from "react-native-custom-fonts";

const fontFaces = {
  // XXX: Specify the local name of your font. You'll use this to refer to it via the useCustomFont hook.
  'UbuntuBold': {
    uri: 'https://github.com/google/fonts/raw/master/ufl/ubuntu/Ubuntu-Bold.ttf',
    fontFamily: 'Ubuntu',
    fontWeight: 'bold',
    // XXX: You can also specify additional font styling.
    color: 'blue',
  },
};

const SomeComponent = () => {
  // Fetch the desired font by name. When the font has been cached, it will automatically update the View.
  const {...fontProps} = useCustomFont('UbuntuBold');
  return (
    <Text
      {...fontProps}
      children="Hello, world!"
    />
  );
};

export default () => (
  <CustomFontsProvider
    fontFaces={fontFaces}
  >
    <SomeComponent />
  </CustomFontsProvider>
);

Where's my ref?

react-native-custom-fonts captures the ref prop of the Text component to make runtime property assignment. You can still access the ref, in one of two ways:

You can either supply a ref:

const ref = useRef();
const {...fontProps} = useCustomFont('UbuntuBold', ref);
return (
  <Text
    ref={ref}
    {...fontProps}
  />
);

Or you can use the provided ref:

const {ref, ...fontProps} = useCustomFont('UbuntuBold');
return (
  <Text
    ref={ref}
    {...fontProps}
  />
);

Awesome, so what about additional styles?

It's possible to do this, too. Just fetch the style prop from the call to useCustomFont:

const {style, ...fontProps} = useCustomFont('UbuntuBold');
return (
  <TextInput
    style={[style, {fontColor: 'blue'}]}
    {...fontProps}
  />
);

📌 Prop Types

`CustomFontsProvider`

This is a React Context Provider for all children who were wrapped with a call to ReactNativeCustomFonts.withCustomFont. Manages the caching and assignment of remote fonts to children.

Prop Name	Data Type	Required	Default	Description
`fontFaces`	propTypes.shape({})	false	{}	Defines the configuration of the remote fonts.
`fallback`	propTypes.shape({})	false	{color: 'red', fontWeight:'bold'}	The style to use when font downloads fail.
`onDownloadDidStart`	propTypes.func	false	() => null	Callback for when the Provider begins downloading the fontFaces.
`onDownloadDidEnd`	propTypes.func	false	() => null	Callback for when the Provider has completed downloading the fontFaces.
`onDownloadDidError`	propTypes.func	false	() => null	Called when an error has been thrown when downloading the fontFaces.

😬 Contributing

Please report any issues you come across, and feel free to submit a Pull Request if you'd like to add any enhancements. To make any changes, you can just branch from master.

✌️ License

MIT

cawfree / react-native-custom-fonts