react-native-qrcode-svg

A QR Code generator for React Native based on react-native-svg and javascript-qrcode.

Discussion: https://discord.gg/RvFM97v

Features

• Easily render QR code images
• Optionally embed a logotype

Installation

Please install react-native-svg first.

npm install react-native-svg --save
react-native link react-native-svg
npm install react-native-qrcode-svg --save

Examples

import QRCode from 'react-native-qrcode-svg';

//Simple usage, defaults for all but the value
render() {
  return (
    <QRCode
      value="http://awesome.link.qr"
    />
  );
};

// 30px logo from base64 string with transparent background
render() {
  let base64Logo = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAOEAA..';
  return (
    <QRCode
      value="Just some string value"
      logo={{uri: base64Logo}}
      logoSize={30}
      logoBackgroundColor='transparent'
    />
  );
};

// 20% (default) sized logo from local file string with white logo backdrop
render() {
  let logoFromFile = require('../assets/logo.png');
  return (
    <QRCode
      value="Just some string value"
      logo={logoFromFile}
    />
  );
};

// get base64 string encode of the qrcode (currently logo is not included)
getDataURL() {
  this.svg.toDataURL(this.callback);
}
callback(dataURL) {
  console.log(dataURL);
}
render() {
  return (
    <QRCode
      value="Just some string value"
      getRef={(c) => (this.svg = c)}
    />
  );
}

Props

Name | Default | Description ----------------|------------|-------------- size | 100 | Size of rendered image in pixels value | 'this is a QR code' | String Value of the QR code. Can also accept an array of segments as defined in Manual mode. Ex. [{ data: 'ABCDEFG', mode: 'alphanumeric' }, { data: '0123456', mode: 'numeric' }, { data: [253,254,255], mode: 'byte' }] color | 'black' | Color of the QR code backgroundColor | 'white' | Color of the background enableLinearGradient | false | enables or disables linear gradient linearGradient | ['rgb(255,0,0)','rgb(0,255,255)'] | array of 2 rgb colors used to create the linear gradient gradientDirection| [170,0,0,0] | the direction of the linear gradient logo | null | Image source object. Ex. {uri: 'base64string'} or {require('pathToImage')} logoSize | 20% of size | Size of the imprinted logo. Bigger logo = less error correction in QR code logoBackgroundColor | backgroundColor | The logo gets a filled quadratic background with this color. Use 'transparent' if your logo already has its own backdrop. logoMargin | 2 | logo's distance to its wrapper logoBorderRadius | 0 | the border-radius of logo image (Android is not supported) quietZone | 0 | quiet zone around the qr in pixels (useful when saving image to gallery) getRef | null | Get SVG ref for further usage ecl | 'M' | Error correction level onError(error) | undefined | Callback fired when exception happened during the code generating process

Saving generated code to gallery

Note: Experimental only ( not tested on iOS) , uses getRef() and needs RNFS module

npm install --save react-native-fs

Example for Android:

import { CameraRoll , ToastAndroid } from "react-native"
import RNFS from "react-native-fs"
...

  saveQrToDisk() {
   	this.svg.toDataURL((data) => {
   		RNFS.writeFile(RNFS.CachesDirectoryPath+"/some-name.png", data, 'base64')
   		  .then((success) => {
   			  return CameraRoll.saveToCameraRoll(RNFS.CachesDirectoryPath+"/some-name.png", 'photo')
   		  })
   		  .then(() => {
   			  this.setState({ busy: false, imageSaved: true  })
   			  ToastAndroid.show('Saved to gallery !!', ToastAndroid.SHORT)
   		  })
   	})
  }

Dependencies

PeerDependencies

• react-native-svg

Dependencies

• node-qrcode

If you like this project, please consider buy me a coffee :)

https://www.buymeacoffee.com/LquC7mid5