Generation of QR Code in React Native

QR Code Generation

If we have to share any small data between different users, we can use the QR Code. Generation of QR Code in React Native is very easy as we just have to install react-native-svg and react-native-qrcode-svg package, which will provide <QRCode/> component to make QRCode.

QR Code known as Quick Response Code is a trademark for a two-dimensional barcode. QR Code is a machine/camera readable block-enabled code for encoding numeric values and alphabetic values. The QR Code stores information within a block of images and can store multiple types of information.

How to use QRCode Component?

<QRCode
  //QR code value
  value={qrvalue}
  //size of QR Code
  size={250}
  //Color of the QR Code (Optional)
  color="black"
  //Background Color of the QR Code (Optional)
  backgroundColor="white"
  //Logo of in the center of QR Code (Optional)
  logo={{
    url:
      'https://raw.githubusercontent.com/AboutReact/sampleresource/master/logosmalltransparen.png',
  }}
  //Center Logo size  (Optional)
  logoSize={30}
  //Center Logo margin (Optional)
  logoMargin={2}
  //Center Logo radius (Optional)
  logoBorderRadius={15}
  //Center Logo background (Optional)
  logoBackgroundColor="yellow"
/>

In this example, we are making a TextInput to get the value for QR Code and after clicking on “Generate QR Code” it will generate the QR Code.

You can also see how to make Barcode and QR Code Scanner using Camera in React Native.

To Make a React Native App

Getting started with React Native will help you to know more about the way you can make a React Native project. We are going to use react native command line interface to make our React Native App.

If you have previously installed a global react-native-cli package, please remove it as it may cause unexpected issues:

npm uninstall -g react-native-cli @react-native-community/cli

Run the following commands to create a new React Native project

npx react-native init ProjectName

If you want to start a new project with a specific React Native version, you can use the --version argument:

npx react-native init ProjectName --version X.XX.X

Note If the above command is failing, you may have old version of react-native or react-native-cli installed globally on your pc. Try uninstalling the cli and run the cli using npx.

This will make a project structure with an index file named App.js in your project directory.

Installation of Dependency

Open the terminal and jump into your project

cd ProjectName

We need to install react-native-svg and react-native-qrcode-svg to generate a QR code

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

npm install react-native-svg --save

This command will copy all the dependencies into your node_module directory. –save is optional, it is just to update the react-navigation dependency in your package.json file.

CocoaPods Installation

Please use the following command to install CocoaPods

npx pod-install

Code for the Generation of QR Code

Now Open App.js in any code editor and replace the code with the following code.

App.js

// Generation of QR Code in React Native
// https://aboutreact.com/generation-of-qr-code-in-react-native/

// import React in our code
import React, {useState} from 'react';

// import all the components we are going to use
import {
  SafeAreaView,
  Text,
  View,
  StyleSheet,
  TextInput,
  TouchableOpacity,
} from 'react-native';

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

const App = () => {
  const [inputText, setInputText] = useState('');
  const [qrvalue, setQrvalue] = useState('');

  return (
    <SafeAreaView style={{flex: 1}}>
      <View style={styles.container}>
        <Text style={styles.titleStyle}>
          Generation of QR Code in React Native
        </Text>
        <QRCode
          //QR code value
          value={qrvalue ? qrvalue : 'NA'}
          //size of QR Code
          size={250}
          //Color of the QR Code (Optional)
          color="black"
          //Background Color of the QR Code (Optional)
          backgroundColor="white"
          //Logo of in the center of QR Code (Optional)
          logo={{
            url:
              'https://raw.githubusercontent.com/AboutReact/sampleresource/master/logosmalltransparen.png',
          }}
          //Center Logo size  (Optional)
          logoSize={30}
          //Center Logo margin (Optional)
          logoMargin={2}
          //Center Logo radius (Optional)
          logoBorderRadius={15}
          //Center Logo background (Optional)
          logoBackgroundColor="yellow"
        />
        <Text style={styles.textStyle}>
          Please insert any value to generate QR code
        </Text>
        <TextInput
          style={styles.textInputStyle}
          onChangeText={
            (inputText) => setInputText(inputText)
          }
          placeholder="Enter Any Value"
          value={inputText}
        />
        <TouchableOpacity
          style={styles.buttonStyle}
          onPress={() => setQrvalue(inputText)}>
          <Text style={styles.buttonTextStyle}>
            Generate QR Code
          </Text>
        </TouchableOpacity>
      </View>
    </SafeAreaView>
  );
};
export default App;

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: 'white',
    justifyContent: 'center',
    alignItems: 'center',
    textAlign: 'center',
    padding: 10,
  },
  titleStyle: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  textStyle: {
    textAlign: 'center',
    margin: 10,
  },
  textInputStyle: {
    flexDirection: 'row',
    height: 40,
    marginTop: 20,
    marginLeft: 35,
    marginRight: 35,
    margin: 10,
  },
  buttonStyle: {
    backgroundColor: '#51D8C7',
    borderWidth: 0,
    color: '#FFFFFF',
    borderColor: '#51D8C7',
    alignItems: 'center',
    borderRadius: 5,
    marginTop: 30,
    padding: 10,
  },
  buttonTextStyle: {
    color: '#FFFFFF',
    paddingVertical: 10,
    fontSize: 16,
  },
});

Code to Generate and Share QR Code

// Generation of QR Code in React Native
// https://aboutreact.com/generation-of-qr-code-in-react-native/

// import React in our code
import React, {useState, useRef} from 'react';

// import all the components we are going to use
import {
  SafeAreaView,
  Text,
  View,
  StyleSheet,
  TextInput,
  TouchableOpacity,
  Share,
} from 'react-native';

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

const App = () => {
  const [inputText, setInputText] = useState('');
  const [qrvalue, setQrvalue] = useState('');
  let myQRCode = useRef();

  const shareQRCode = () => {
    myQRCode.toDataURL((dataURL) => {
      console.log(dataURL);
      let shareImageBase64 = {
        title: 'React Native',
        url: `data:image/png;base64,${dataURL}`,
        subject: 'Share Link', //  for email
      };
      Share.share(shareImageBase64).catch((error) => console.log(error));
    });
  };

  return (
    <SafeAreaView style={{flex: 1}}>
      <View style={styles.container}>
        <Text style={styles.titleStyle}>
          Generation of QR Code in React Native
        </Text>
        <QRCode
          getRef={(ref) => (myQRCode = ref)}
          // ref={myQRCode}
          //QR code value
          value={qrvalue ? qrvalue : 'NA'}
          //size of QR Code
          size={250}
          //Color of the QR Code (Optional)
          color="black"
          //Background Color of the QR Code (Optional)
          backgroundColor="white"
          //Center Logo size  (Optional)
          logoSize={30}
          //Center Logo margin (Optional)
          logoMargin={2}
          //Center Logo radius (Optional)
          logoBorderRadius={15}
          //Center Logo background (Optional)
          logoBackgroundColor="yellow"
        />
        <Text style={styles.textStyle}>
          Please insert any value to generate QR code
        </Text>
        <TextInput
          style={styles.textInputStyle}
          onChangeText={(inputText) => setInputText(inputText)}
          placeholder="Enter Any Value"
          value={inputText}
        />
        <TouchableOpacity
          style={styles.buttonStyle}
          onPress={() => setQrvalue(inputText)}>
          <Text style={styles.buttonTextStyle}>
            Generate QR Code
          </Text>
        </TouchableOpacity>

        <TouchableOpacity
          style={styles.buttonStyle}
          onPress={shareQRCode}>
          <Text style={styles.buttonTextStyle}>
            Share QR Code
          </Text>
        </TouchableOpacity>
      </View>
    </SafeAreaView>
  );
};
export default App;

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: 'white',
    justifyContent: 'center',
    alignItems: 'center',
    textAlign: 'center',
    padding: 10,
  },
  titleStyle: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  textStyle: {
    textAlign: 'center',
    margin: 10,
  },
  textInputStyle: {
    flexDirection: 'row',
    height: 40,
    marginTop: 20,
    marginLeft: 35,
    marginRight: 35,
    margin: 10,
  },
  buttonStyle: {
    backgroundColor: '#51D8C7',
    borderWidth: 0,
    color: '#FFFFFF',
    borderColor: '#51D8C7',
    alignItems: 'center',
    borderRadius: 5,
    marginTop: 30,
    padding: 10,
  },
  buttonTextStyle: {
    color: '#FFFFFF',
    paddingVertical: 10,
    fontSize: 16,
  },
});

To Run the React Native App

Open the terminal again and jump into your project using.

cd ProjectName

1. Start Metro Bundler

First, you will need to start Metro, the JavaScript bundler that ships with React Native. To start Metro bundler run following command:

npx react-native start

Once you start Metro Bundler it will run forever on your terminal until you close it. Let Metro Bundler run in its own terminal. Open a new terminal and run the application.

2. Start React Native Application

To run the project on an Android Virtual Device or on real debugging device:

npx react-native run-android

or on the iOS Simulator by running (macOS only)

npx react-native run-ios

Output Screenshots

That was the React Native Generate QR Code. If you have any doubts or want to share something about the topic you can comment below or contact us here. There will be more posts coming soon. Stay tuned!

Hope you liked it. 🙂