This library adds support for dynamic styling based on device size, it was built to replace inline dynamic styles for individual components.

This library builds a single stylesheet from the provided styles and conditionally returns them based on device size. It uses a custom version of React Native's useWindowDimensions so that it only re-renders when the device size passes over one of the breakpoints, instead of re-rendering on every pixel change.

Installation

yarn add rn-responsive-styles or npm install rn-responsive-styles --save

Demo

Usage

import { Text, View } from 'react-native'
import { CreateResponsiveStyle, DEVICE_SIZES, useDeviceSize } from 'rn-responsive-styles'

export default function App() {
  const styles = useStyles()
  const deviceSize = useDeviceSize()

  return (
    <View style={styles.container}>
      <Text style={styles.text}>Device Size: {deviceSize}</Text>
    </View>
  )
}

const useStyles = CreateResponsiveStyle(
  {
    container: {
      flex: 1,
      backgroundColor: '#fff',
      alignItems: 'center',
      justifyContent: 'center',
    },
    text: {
      fontSize: 30,
      color: 'white',
    },
  },
  {
    [DEVICE_SIZES.XL]: {
      container: {
        backgroundColor: 'blue',
      },
    },
    [DEVICE_SIZES.SM]: {
      container: {
        backgroundColor: 'red',
      },
      text: {
        fontSize: 20,
      },
    },
  }
)

Simple Media Queries

To specify styles that apply to multiple device sizes you can use the built in minSize() and maxSize() functions. These allow you to specify styles similar to CSS media queries min-width and max-width.

import { CreateResponsiveStyle, DEVICE_SIZES, minSize, maxSize } from 'rn-responsive-styles'

const useStyles = CreateResponsiveStyle(
  { ... },
  {
    // Will apply the size 30 font to large and extra large devices
    [minSize(DEVICE_SIZES.LG)]: {
      text: {
        fontSize: 30,
      },
    },
    // Will apply the size 20 to medium, small and extra-small devices
    [maxSize(DEVICE_SIZES.MD)]: {
      text: {
        fontSize: 20,
      },
    },
  },
)

Using Media Queries for Conditional Rendering

useSizeRender is a custom hook provided to facilitate conditional rendering based on the device size. It returns three helper functions: isSmallerThan, isLargerThan, and isSize, which can be used to determine if the current device size is smaller than, larger than, or equal to a specified size. This allows you to add performant conditional rendering that will only trigger a re-render when the device size changes.

import React from 'react'
import { Text, View } from 'react-native'
import { useSizeRender, DEVICE_SIZES } from 'rn-responsive-styles'

export default function Sample() {
  const styles = useStyles()
  const { isLargerThan, isSmallerThan, isSize } = useSizeRender()

  return (
    <View style={styles.container}>
      <Text style={styles.text}>Device Size: {useDeviceSize()}</Text>
      {isLargerThan(DEVICE_SIZES.MD) && <Text>Only rendered for devices larger than medium</Text>}
      {isSize(DEVICE_SIZES.MD) && <Text>Only rendered for medium devices</Text>}
      {isSmallerThan(DEVICE_SIZES.MD) && <Text>Only rendered for devices smaller than medium</Text>}
    </View>
  )
}

Breakpoints

The currently configured breakpoints are:

| Size | Value | Shorthand | Breakpoints | | :---------: | :-------------------------------: | :---------------: | :-------------------: | | extra small | DEVICE_SIZES.EXTRA_SMALL_DEVICE | DEVICE_SIZES.XS | width <= 540 | | small | DEVICE_SIZES.SMALL_DEVICE | DEVICE_SIZES.SM | 540 < width <= 768 | | medium | DEVICE_SIZES.MEDIUM_DEVICE | DEVICE_SIZES.MD | 768 < width <= 992 | | large | DEVICE_SIZES.LARGE_DEVICE | DEVICE_SIZES.LG | 992 < width <= 1200 | | extra large | DEVICE_SIZES.EXTRA_LARGE_DEVICE | DEVICE_SIZES.XL | 1200 < width |

Customizing Breakpoints

If you would like to change the breakpoints you can wrap your entire app in the BreakpointsProvider this will allow you to specify exactly when styles will come into effect. This is optional and only required for finer control over styling different device sizes.

import { BreakpointsProvider } from 'rn-responsive-styles'

export default function App() {
  return (
    <BreakpointsProvider breakpoints={[1200, 992, 768, 540]}>
      <Component />
    </BreakpointsProvider>
  )
}

Support for Next.js

NextJS provides server-side-rendering (SSR) for react-native-web projects. This library supports that by delaying rendering until it has reached the client, this is a similar approach used by many other packages, as there is no way to know the device size in the server, so responsive styles are meaningless. In order to support SSR you must add this provider to your component that imports any component relying on rn-responsive-styles. The best way to do this is in your App.tsx or index.tsx file add the SSRProvider

import { ActivityIndicator } from 'react-native'
import { SSRProvider } from 'rn-responsive-styles'

export default function App() {
  return (
    <SSRProvider placeholder={<ActivityIndicator />}>
      <Component />
    </SSRProvider>
  )
}

• You can see the full example in the nexpo-example directory