A React-Native utility belt for scaling the size your apps UI across different sized devices.
![](https://raw.githubusercontent.com/Meligy/react-native-size-matters/master/./examples/ipad.gif)
npm install --save react-native-size-matters
//or:
yarn add react-native-size-matters
When developing with react-native, you need to manually adjust your app to look great on variety of different screen sizes. That's a tedious job.
react-native-size-matters provides some simple tooling to make your scaling a whole lot easier.
The idea is to develop once on a standard ~5" screen mobile device and then simply apply the provided utils.
📖 You can read more about what led to this library on my blog post, that can be found in this repo or at Soluto Engineering Blog.
import { scale, verticalScale, moderateScale } from 'react-native-size-matters';
const Component = props =>
<View style={{
width: scale(30),
height: verticalScale(50),
padding: moderateScale(5)
}}/>;
-
scale(size: number)
Will return linear scaled result of the provided size, based on your device's screen width. -
verticalScale(size: number)
Will return linear scaled result of the provided size, based on your device's screen height. -
moderateScale(size: number, factor?: number)
Sometimes you don't want to scale everything in a linear manner, that's where moderate scale comes in.
The cool thing about it is that you can control the resize factor (default is 0.5).
If normal scale will increase your size by +2X, moderateScale will only increase it by +X, for example:
➡️ scale(10) = 20
➡️ moderateScale(10) = 15
➡️ moderateScale(10, 0.1) = 11
import { ScaledSheet } from 'react-native-size-matters';
const styles = ScaledSheet.create(stylesObject)
ScaleSheet will take the same stylesObject a regular StyleSheet will take, plus a special (optional) annotation that will automatically apply the scale functions for you:
<size>@s
- will applyscale
function onsize
.<size>@vs
- will applyverticalScale
function onsize
.<size>@ms
- will applymoderateScale
function with resize factor of 0.5 onsize
.<size>@ms<factor>
- will applymoderateScale
function with resize factor offactor
on size.
Example:
import { ScaledSheet } from 'react-native-size-matters';
const styles = ScaledSheet.create({
container: {
width: '100@s', // = scale(100)
height: '200@vs', // = verticalScale(200)
margin: 5
},
row: {
padding: '10@ms0.3', // = moderateScale(10, 0.3)
height: '50@ms' // = moderateScale(50)
}
});
You can clone the expo-example-app from this repo, run npm install
and npm start
and scan the presented QR code in the Expo app on your preferred device.
The app has a on/off switch for using react-native-size-matters
, so you can test yourself how the app will look with and without scaling.
It is expected to look good on every device you want - iOS or Android, phone or tablet, basically anything (please let me know if not).
There are also some attached screenshots in the repo if you don't feel like cloning.