@pushpendersingh/react-native-scanner

@pushpendersingh/react-native-scanner

A QR code & Barcode Scanner for React Native Projects.

For React Native developers that need to scan barcodes and QR codes in their apps, this package is a useful resource. It supports React Native's new Fabric Native architecture and was created in Kotlin and Objective-C.

With this package, users can quickly and easily scan barcodes and QR codes with their device's camera. Using this package, several types of codes can be scanned, and it is simple to use.

If you want to provide your React Native app the ability to read barcodes and QR codes, you should definitely give this package some thought.

The @pushpendersingh/react-native-scanner package also includes a flashlight feature that can be turned on and off. This can be useful when scanning QR codes & barcodes in low light conditions.

Getting started

Requirements

IOS

Open your project's Info.plist and add the following lines inside the outermost <dict> tag:

<key>NSCameraUsageDescription</key>
<string>Your message to user when the camera is accessed for the first time</string>

Open your project's Podfile and add enable the new architecture:

:fabric_enabled => true,

Run below command to enable the new architecture in IOS folder

bundle install && RCT_NEW_ARCH_ENABLED=1 bundle exec pod install

Android

Open your project's AndroidManifest.xml and add the following lines inside the <manifest> tag:

<uses-permission android:name="android.permission.CAMERA" />

<uses-feature android:name="android.hardware.camera.any" />

Open your project's gradle.properties and add enable the new architecture:

newArchEnabled=true

To install and start using @pushpendersingh/react-native-scanner

npm install @pushpendersingh/react-native-scanner

Supported Formats

1D product	1D industrial	2D
UPC-A	Code 39	QR Code
UPC-E	Code 93	Data Matrix
EAN-8	Code 128	Aztec
EAN-13	Codabar	PDF 417
	ITF

Usage

To use @pushpendersingh/react-native-scanner, import the @pushpendersingh/react-native-scanner module and use the <ReactNativeScannerView /> tag. More usage examples can be seen under the examples/ folder.

Basic usage

Here is an example of basic usage:

import React, {useEffect, useRef, useState} from 'react';
import {
  Alert,
  Platform,
  Text,
  SafeAreaView,
  Button,
  View,
  StyleSheet,
} from 'react-native';

import {
  request,
  PERMISSIONS,
  openSettings,
  RESULTS,
} from 'react-native-permissions'; // For camera permission
import {
  Commands,
  ReactNativeScannerView,
} from '@pushpendersingh/react-native-scanner';

export default function App() {
  const scannerRef = useRef(null);
  const [isCameraPermissionGranted, setIsCameraPermissionGranted] =
    useState(false);
  const [isActive, setIsActive] = useState(true);
  const [scannedData, setScannedData] = useState(null);

  useEffect(() => {
    checkCameraPermission();
  }, []);

  const handleBarcodeScanned = event => {
    const {data, bounds, type} = event?.nativeEvent;
    setScannedData({data, bounds, type});
    console.log('Barcode / QR Code scanned:', data, bounds, type);
  };

  const enableFlashlight = () => {
    if (scannerRef?.current) {
      Commands.enableFlashlight(scannerRef.current);
    }
  };

  const disableFlashlight = () => {
    if (scannerRef?.current) {
      Commands.disableFlashlight(scannerRef.current);
    }
  };

  // Pause the camera after barcode / QR code is scanned
  const stopScanning = () => {
    if (scannerRef?.current) {
      Commands.stopScanning(scannerRef?.current);
      console.log('Scanning paused');
    }
  };

  // Resume the camera after barcode / QR code is scanned
  const resumeScanning = () => {
    if (scannerRef?.current) {
      Commands.resumeScanning(scannerRef?.current);
      console.log('Scanning resumed');
    }
  };

  const releaseCamera = () => {
    if (scannerRef?.current) {
      Commands.releaseCamera(scannerRef?.current);
    }
  }

  const startScanning = () => {
    if (scannerRef?.current) {
      Commands.startCamera(scannerRef?.current);
    }
  }

  const checkCameraPermission = async () => {
    request(
      Platform.OS === 'ios'
        ? PERMISSIONS.IOS.CAMERA
        : PERMISSIONS.ANDROID.CAMERA,
    ).then(async (result: any) => {
      switch (result) {
        case RESULTS.UNAVAILABLE:
          // console.log('This feature is not available (on this device / in this context)');
          break;
        case RESULTS.DENIED:
          Alert.alert(
            'Permission Denied',
            'You need to grant camera permission first',
          );
          openSettings();
          break;
        case RESULTS.GRANTED:
          setIsCameraPermissionGranted(true);
          break;
        case RESULTS.BLOCKED:
          Alert.alert(
            'Permission Blocked',
            'You need to grant camera permission first',
          );
          openSettings();
          break;
      }
    });
  };

  if (isCameraPermissionGranted) {
    return (
      <SafeAreaView style={styles.container}>
        {isActive && (
          <ReactNativeScannerView
            ref={scannerRef}
            style={styles.scanner}
            onQrScanned={handleBarcodeScanned}
            pauseAfterCapture={true} // Pause the scanner after barcode / QR code is scanned
            isActive={isActive} // Start / stop the scanner using this prop
            showBox={true} // Show the box around the barcode / QR code
          />
        )}

        <View style={styles.controls}>
          <Button
            title="Stop Scanning"
            onPress={() => {
              stopScanning();
              setIsActive(false);
            }}
          />
          <Button
            title="Resume Scanning"
            onPress={() => {
              resumeScanning();
              setIsActive(true);
            }}
          />
          <Button
            title="Flash Off"
            onPress={() => {
              disableFlashlight();
            }}
          />
          <Button
            title="Flash On"
            onPress={() => {
              enableFlashlight();
            }}
          />
          <Button
            title="Release Camera"
            onPress={() => {
              releaseCamera();
            }}
          />
          <Button
            title="Start Camera"
            onPress={() => {
              startScanning();
            }}
          />
        </View>

        {scannedData && (
          <View style={styles.result}>
            <Text style={styles.resultText}>
              Scanned Data: {scannedData?.data}
            </Text>
            <Text style={styles.resultText}>Type: {scannedData?.type}</Text>
          </View>
        )}
      </SafeAreaView>
    );
  } else {
    return (
      <Text style={styles.TextStyle}>
        You need to grant camera permission first
      </Text>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  box: {
    position: 'absolute',
    borderWidth: 2,
    borderColor: 'green',
    zIndex: 10,
  },
  scanner: {
    flex: 1,
  },
  controls: {
    flexDirection: 'row',
    justifyContent: 'space-around',
    marginVertical: 10,
    flexWrap: 'wrap',
    gap: 8,
    marginHorizontal: 10,
  },
  result: {
    marginTop: 16,
    padding: 16,
    backgroundColor: '#f9f9f9',
    borderRadius: 8,
  },
  resultText: {
    fontSize: 16,
    marginVertical: 4,
  },
  TextStyle: {
    fontSize: 30,
    color: 'red',
  },
});

Flashlight Feature

Flashlight Feature

To use the flashlight feature, add the following code to your project:

import React, {useEffect, useRef, useState} from 'react';
import {
  Alert,
  Platform,
  useWindowDimensions,
  Text,
  SafeAreaView,
  TouchableOpacity,
} from 'react-native';

import {
  request,
  PERMISSIONS,
  openSettings,
  RESULTS,
} from 'react-native-permissions';
import {
  ReactNativeScannerView,
  Commands,
} from '@pushpendersingh/react-native-scanner';

export default function App() {
  const {height, width} = useWindowDimensions();
  const [isCameraPermissionGranted, setIsCameraPermissionGranted] =
    useState(false);
  const cameraRef = useRef(null);

  useEffect(() => {
    checkCameraPermission();

    return () => {
      if(cameraRef.current) {
        Commands.releaseCamera(cameraRef.current);
      }
    };
  }, []);

  const enableFlashlight = () => {
    Commands.enableFlashlight(cameraRef.current);
  };

  const disableFlashlight = () => {
    Commands.disableFlashlight(cameraRef.current);
  };

  const checkCameraPermission = async () => {
    request(
      Platform.OS === 'ios'
        ? PERMISSIONS.IOS.CAMERA
        : PERMISSIONS.ANDROID.CAMERA,
    ).then(async (result: any) => {
      switch (result) {
        case RESULTS.UNAVAILABLE:
          break;
        case RESULTS.DENIED:
          Alert.alert(
            'Permission Denied',
            'You need to grant camera permission first',
          );
          openSettings();
          break;
        case RESULTS.GRANTED:
          setIsCameraPermissionGranted(true);
          break;
        case RESULTS.BLOCKED:
          Alert.alert(
            'Permission Blocked',
            'You need to grant camera permission first',
          );
          openSettings();
          break;
      }
    });
  };

  if (isCameraPermissionGranted) {
    return (
      <SafeAreaView style={{flex: 1}}>
        <ReactNativeScannerView
          ref={ref => (cameraRef.current = ref)}
          style={{height, width}}
          onQrScanned={(value: any) => {
            console.log(value.nativeEvent);
          }}
        />

        <TouchableOpacity
          style={{
            position: 'absolute',
            bottom: 20,
            left: 20,
            padding: 10,
            backgroundColor: 'blue',
            borderRadius: 10,
          }}
          onPress={enableFlashlight}>
          <Text>Turn ON</Text>
        </TouchableOpacity>

        <TouchableOpacity
          style={{
            position: 'absolute',
            bottom: 20,
            right: 20,
            padding: 10,
            backgroundColor: 'blue',
            borderRadius: 10,
          }}
          onPress={disableFlashlight}>
          <Text>Turn OFF</Text>
        </TouchableOpacity>
      </SafeAreaView>
    );
  } else {
    return (
      <Text style={{fontSize: 30, color: 'red'}}>
        You need to grant camera permission first
      </Text>
    );
  }
}

Props

onQrScanned (required)

propType: function.isRequired default: (e) => (console.log('QR code scanned!', e))

In the event that a QR code or barcode is detected in the camera's view, this specified method will be called.

pauseAfterCapture (required)

propType: boolean default: false

If set to true, the scanner will pause after capturing a QR code or barcode.

showBox (optional)

propType: boolean default: false

If set to true, a green box will be displayed around the QR code or barcode that is detected.

isActive (required)

propType: boolean default: true

If set to false, the scanner will be disabled. This can be useful when you want to pause the scanner.

Native Commands

The @pushpendersingh/react-native-scanner package also includes a few native commands that can be used to control the camera and flashlight.

Commands

enableFlashlight

This command is used to turn on the flashlight.

if(cameraRef.current) {
  Commands.enableFlashlight(cameraRef.current);
}

disableFlashlight

This command is used to turn off the flashlight.

if(cameraRef.current) {
  Commands.disableFlashlight(cameraRef.current);
}

releaseCamera

This command is used to release the camera.

if(cameraRef?.current) {
  Commands?.releaseCamera(cameraRef?.current);
}

startCamera

This command is used to start the camera.

if(cameraRef?.current) {
  Commands.startCamera(cameraRef?.current);
}

stopScanning

This command is used to stop the scanning.

if(cameraRef.current) {
  Commands.stopScanning(cameraRef.current);
}

resumeScanning

This command is used to resume the scanning.

if(cameraRef.current) {
  Commands.resumeScanning(cameraRef.current);
}

Contributing

See the contributing guide to learn how to contribute to the repository and the development workflow.

License

MIT