Create React Native Named StyleSheets with Support for Dark/Light/Auto Mode

react-native-themed-stylesheet

A package that allows you to create React Native StyleSheets with support for Dark/Light/Auto Themes.

• Depends on react-native-appearance to choose the theme based on OS preference(Android 10/iOS 13)
• Simple API
• Fully typed
• Builds on top of StyleSheets and Hooks
• Storybook addon to change Theme Mode

Installation

Using Expo

expo install react-native-appearance react-native-themed-stylesheet

Using Yarn

yarn add react-native-appearance react-native-themed-stylesheet

Using NPM

npm install --save react-native-appearance react-native-themed-stylesheet

Usage

Creating the theme:

// theme.ts
import { createTheme } from 'react-native-themed-stylesheet'

const themes = {
  light: {
    textColor: '#ff0000'
  },
  dark: {
    textColor: '#fff'
  },
  common: { // Optional
    fontSize: 12
  }
}

const { ThemeProvider, useStyle, useTheme } = createTheme(themes, 'auto') // Initial Mode is optional(Default: 'auto')

export { ThemeProvider, useStyle, useTheme }

Using the theme:

// Components.tsx
import React from 'react'
import { View, Text, Button } from 'react-native'
import { ThemeProvider, useStyle, useTheme } from './theme'

const ComponentWithUseStyle: React.FC = () => {
  const styles = useStyle(theme => {
    text: {
      color: options.disabled ? '#C9C9C9' : theme.textColor,
      fontSize: theme.fontSize
    }
  })

  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text style={styles.text}>Hello World</Text>
    </View>
  )
}

const ComponentWithUseTheme: React.FC = () => {
  const { theme, mode, setThemes, setMode } = useTheme()
  console.log('Current Mode:', mode)

  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text style={{ color: theme.textColor, fontSize: theme.fontSize }}>Hello World</Text>
      <Button title='Dark Mode' onPress={() => setMode('dark')}/>
      <Button title='Light Mode' onPress={() => setMode('light')}/>
      <Button title='Auto Mode' onPress={() => setMode('auto')}/>
      <Button title='Change Themes' onPress={
          () => setThemes({
            light: {
              textColor: '#ffff00'
            },
            dark: {
              textColor: '#C9C9C9'
            },
            common: {
              fontSize: 14
            }
          })
        }
      />
    </View>
  )
}

Storybook Addon

Installation:

// storybook.js
import {
  getStorybookUI,
  configure,
  addDecorator,
  addParameters
} from '@storybook/react-native'
import { withThemeHook } from 'react-native-themed-stylesheet/storybook'
import 'react-native-themed-stylesheet/storybook/register'
import { useTheme } from './theme'

addDecorator(withThemeHook)
addParameters({
  useTheme
})

configure(() => {
  require('path/to/some/story')
}, module)

const StorybookUIRoot = getStorybookUI()

export default StorybookUIRoot // Make sure to use this component within ThemeProvider.

API

Function: createTheme(themes, [initialMode])

Use this function to create the theme.

Parameters

• themes: An object containing light, dark and an optional common theme(Will be merge with boths themes).
• initialMode: A string(‘light’, ‘dark’ or ‘auto’) specifying the initial mode(Default: ‘auto’).

Returns

ThemeObject

---

Object: ThemeObject

An object containing the following properties:

• ThemeProvider: Theme Provider.
• useStyle: Hook to create Named StyleSheets.
• useTheme: Hook to get access to ThemeContext.

---

React Component: ThemeProvider

A react component to provide ThemeContext.

---

Function: useStyle(createStyles)

Hook to create themed stylesheets.

Parameters

• createStyles: A function that receives the current theme and returns an object of type T.

Returns

StyleSheet.NamedStyles<T>

---

Function: useTheme()

Hook to get access to theme context.

Returns

{ theme, mode, setThemes, setMode }

An object containing the following properties:

• theme: The current theme.
• mode: The current mode.
• setThemes: Function to set the themes(The same type of createTheme themes param).
• setMode: Function to set the mode(‘light’, ‘dark’ or ‘auto’).

Download Details:

Author: andreppedroza

Source Code: https://github.com/andreppedroza/react-native-themed-stylesheet

#react-native #react #mobile-apps

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