react native qr code scanner

React Native QR Code Scanner

As a developer, I have worked with different programming languages and frameworks to create web applications. Among these, I have had the opportunity to use React Native to create mobile applications. One of the key features that many mobile apps require is the ability to scan QR codes. In this post, I will discuss how to implement a QR code scanner using React Native.

Using react-native-camera

The easiest way to add a QR code scanner in a React Native application is to use the react-native-camera package. This package provides a camera component that can scan QR codes and return the result.

To use react-native-camera, you need to install it in your project using the command:

npm install react-native-camera

Once you've installed the package, you need to link it to your project using the command:

react-native link react-native-camera

After linking the package, you can use the RNCamera component in your code. Here's an example of how to use it to scan a QR code:

import React, { useState } from 'react';
import { View, Text } from 'react-native';
import { RNCamera } from 'react-native-camera';

const ScannerScreen = () => {
  const [result, setResult] = useState('');

  const handleBarCodeScanned = ({ data }) => {
    setResult(data);
  };

  return (
    
      
      {result !== '' && (
        
          {result}
        
      )}
    
  );
};

export default ScannerScreen;

In this example, we define a ScannerScreen component that renders the RNCamera component. We also define a state variable called result to store the scanned QR code value. Whenever a QR code is scanned, the handleBarCodeScanned function is called, which sets the result state variable. Finally, if a QR code has been scanned, the component renders a view showing the scanned value.

Using react-native-qrcode-scanner

Another package that you can use to add a QR code scanner in a React Native application is react-native-qrcode-scanner. This package is similar to react-native-camera, but provides additional features like scanning multiple barcodes and customizing the scanner view.

To use react-native-qrcode-scanner, you need to install it in your project using the command:

npm install react-native-qrcode-scanner

Once you've installed the package, you need to link it to your project using the command:

react-native link react-native-qrcode-scanner

After linking the package, you can use the QRCodeScanner component in your code. Here's an example of how to use it to scan a QR code:

import React, { useState } from 'react';
import { View, Text } from 'react-native';
import QRCodeScanner from 'react-native-qrcode-scanner';

const ScannerScreen = () => {
  const [result, setResult] = useState('');

  const handleBarCodeScanned = ({ data }) => {
    setResult(data);
  };

  return (
    
      
      {result !== '' && (
        
          {result}
        
      )}
    
  );
};

export default ScannerScreen;

In this example, we define a ScannerScreen component that renders the QRCodeScanner component. We also define a state variable called result to store the scanned QR code value. Whenever a QR code is scanned, the handleBarCodeScanned function is called, which sets the result state variable. Finally, if a QR code has been scanned, the component renders a view showing the scanned value.

Conclusion

In this post, we discussed how to add a QR code scanner in a React Native application. We looked at two packages that can be used for this purpose: react-native-camera and react-native-qrcode-scanner. Both packages are easy to use and provide similar features. Depending on your requirements, you can choose either of them to add a QR code scanner in your app.