react-native-qrcode-scanner
    TypeScript icon, indicating that this package has built-in type declarations

    1.5.4 • Public • Published

    react-native-qrcode-scanner

    npm version Backers on Open Collective Sponsors on Open Collective

    A QR code scanner component for React Native built on top of react-native-camera by Lochlan Wansbrough

    Please note, this will also function as a generic barcode scanner by the virtue of the above module supporting barcode scanning, however, this module was initially built as a QR code scanner.

    This module was originally written because the author couldn't find a module that could be simply plugged into a project without requiring too much setup.

    Looking for active contributors. See Contribution guide for more details.

    Please note: Most of the support on debugging new issues, especially with Android, relies on the open source community. The project is on the look out for active contributors who want to maintain this library more rigorously.

    Getting started

    Requirements

    iOS 10

    With iOS 10 and higher you need to add the "Privacy - Camera Usage Description" key to the info.plist of your project. This should be found in 'your_project/ios/your_project/Info.plist'. Add the following code:

    <key>NSCameraUsageDescription</key>
    <string>Your message to user when the camera is accessed for the first time</string>
    
    <!-- Include this only if you are planning to use the camera roll -->
    <key>NSPhotoLibraryUsageDescription</key>
    <string>Your message to user when the photo library is accessed for the first time</string>
    
    <!-- Include this only if you are planning to use the microphone for video recording -->
    <key>NSMicrophoneUsageDescription</key>
    <string>Your message to user when the microsphone is accessed for the first time</string>
    

    Android 7

    With Android 7 and higher you need to add the "Vibration" permission to your AndroidManifest.xml of your project. This should be found in your android/app/src/main/AndroidManifest.xml Add the following:

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

    You need to add the "missingDimensionStrategy" config for the 'react-native-camera' setting to 'general', this should be found in your android/app/build.gradle add the following:

    android {
      ...
      defaultConfig {
        ...
        missingDimensionStrategy 'react-native-camera', 'general' <-- insert this line
      }
    }
    

    react-native-camera

    react-native-camera is a dependency for this package that you'll need to add to your project. To install, run the following commands:

    1. npm install react-native-camera --save
    2. react-native link react-native-camera

    New Version/Migration

    If using an older version of this module with RCTCamera you will need to follow the docs here to move from the old RCTCamera to the new RNCamera. You will then need to install it as above.

    Versions of this library > 0.0.30 will not support react-native-camera versions less than 1.0.0.

    To install and start using react-native-qrcode-scanner:

    1. npm install react-native-qrcode-scanner --save
    2. react-native link react-native-qrcode-scanner

    react-native-permissions

    You will also need to install react-native-permissions to handle camera related permissions

    1. npm install react-native-permissions --save
    2. react-native link react-native-permissions

    For iOS, as part of the react-native-permissions setup you will need to add the following code to your Podfile

    permissions_path = '../node_modules/react-native-permissions/ios'
    pod 'Permission-Camera', :path => "#{permissions_path}/Camera"
    

    You may also need to reset your simulator data after adding those permissions Device -> Erase All Content and Settings...

    Usage

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

    Here is an example of basic usage:

    'use strict';
    
    import React, { Component } from 'react';
    
    import {
      AppRegistry,
      StyleSheet,
      Text,
      TouchableOpacity,
      Linking
    } from 'react-native';
    
    import QRCodeScanner from 'react-native-qrcode-scanner';
    import { RNCamera } from 'react-native-camera';
    
    class ScanScreen extends Component {
      onSuccess = e => {
        Linking.openURL(e.data).catch(err =>
          console.error('An error occured', err)
        );
      };
    
      render() {
        return (
          <QRCodeScanner
            onRead={this.onSuccess}
            flashMode={RNCamera.Constants.FlashMode.torch}
            topContent={
              <Text style={styles.centerText}>
                Go to{' '}
                <Text style={styles.textBold}>wikipedia.org/wiki/QR_code</Text> on
                your computer and scan the QR code.
              </Text>
            }
            bottomContent={
              <TouchableOpacity style={styles.buttonTouchable}>
                <Text style={styles.buttonText}>OK. Got it!</Text>
              </TouchableOpacity>
            }
          />
        );
      }
    }
    
    const styles = StyleSheet.create({
      centerText: {
        flex: 1,
        fontSize: 18,
        padding: 32,
        color: '#777'
      },
      textBold: {
        fontWeight: '500',
        color: '#000'
      },
      buttonText: {
        fontSize: 21,
        color: 'rgb(0,122,255)'
      },
      buttonTouchable: {
        padding: 16
      }
    });
    
    AppRegistry.registerComponent('default', () => ScanScreen);

    Screenshot of the above:

    screenshot 2017-05-02 15 06 33

    Please open an issue if something doesn't work or is not clear enough.

    Methods

    reactivate()

    Call this method to programmatically enabling scanning again. Use this by attaching a ref like so <QRCodeScanner ref={(node) => { this.scanner = node }}> and calling this.scanner.reactivate()

    Props

    onRead (required)

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

    Will call this specified method when a QR code or a barcode is detected in the camera's view passing in the event emitted upon reading the code.

    fadeIn

    propType: bool default: true

    When set to true this ensures that the camera view fades in after the initial load up instead of being rendered immediately. Set this to false to prevent the animated fade in of the camera view.

    reactivate

    propType: bool default: false

    When set to false, when a QR code is scanned, the QRCodeScanner will not scan another code until it is re-rendered. When set to true this will reactivate the scanning ability of the component.

    reactivateTimeout

    propType: number default: 0

    Use this to configure how long it should take (in milliseconds) before the QRCodeScanner should reactivate.

    cameraTimeout

    propType: number default: 0

    Use this to configure how long it should take (in milliseconds) before the QRCodeScanner should be displayed. After that the camera will be inactive and press the view to reactivate it. The 0 default means it's always on.

    cameraTimeoutView

    propType: element

    Pass an RN element/component to show it when the camera is inactive for cameraTimeout (another prop) milliseconds. If the cameraTimeout is 0 or not specified, this prop will never be used.

    flashMode

    propType: RNCamera.Constants.FlashMode default: RNCamera.Constants.FlashMode.auto

    Flash modes

    FYI: react-native-camera/flashMode

    • RNCamera.Constants.FlashMode.off turns it off.
    • RNCamera.Constants.FlashMode.on means camera will use flash in all photos taken.
    • RNCamera.Constants.FlashMode.auto leaves your phone to decide when to use flash when taking photos, based on the lightning conditions that the camera observes.
    • RNCamera.Constants.FlashMode.torch turns on torch mode, meaning the flash light will be turned on all the time (even before taking photo) just like a flashlight.

    topContent

    propType: oneOfType([ PropTypes.element, PropTypes.string, ])

    Use this to render any additional content at the top of the camera view.

    bottomContent

    propType: oneOfType([ PropTypes.element, PropTypes.string, ])

    Use this to render any additional content at the bottom of the camera view.

    containerStyle

    propType: any

    Use this to pass styling for the outermost container. Useful for adding margin/padding to account for navigation bar.

    cameraStyle

    propType: any

    Use this to pass or overwrite styling for the camera window rendered.

    topViewStyle

    propType: any

    Use this to pass or overwrite styling for the <View> that contains the topContent prop.

    bottomViewStyle

    propType: any

    Use this to pass or overwrite styling for the <View> that contains the bottomContent prop.

    showMarker

    propType: boolean default: false

    Use this to show marker on the camera scanning window.

    customMarker

    propType: element

    Pass a RN element/component to use it as a custom marker.

    markerStyle

    propType: any

    Use this to add custom styling to the default marker.

    notAuthorizedView

    propType: element

    Pass a RN element/component to use it when no permissions given to the camera (iOS only).

    cameraType

    propType: oneOf(['front', 'back']) default: 'back'

    Use this to control which camera to use for scanning QR codes, defaults to rear camera.

    checkAndroid6Permissions

    propType: bool default: false

    Use this to enable permission checking on Android 6

    permissionDialogTitle

    propType: string default: 'Info'

    Use this to set permission dialog title (Android only).

    permissionDialogMessage

    propType: string default: 'Need camera permission'

    Use this to set permission dialog message (Android only).

    buttonPositive

    propType: string default: 'OK'

    Use this to set permission dialog button text (Android only).

    cameraProps

    propType: object

    Properties to be passed to the Camera component.

    Contributors

    This project exists thanks to all the people who contribute. We're immensely gratetful to everyone who has taken the time to submit pull requests, spent time debugging or filing issues.

    Backers & Sponsors

    Most of the core contributors maintain this library, add new features, and review PRs in their free time. If you're using react-native-qrcode-scanner in a commercial app, or have found it to be valuable, please considering backing or sponsoring the project on OpenCollective. Please note that you do not need to give any amount of money in order to use this library.

    This is how the donations will be used:

    • Allow the core contributors to work on react-native-qrcode-scanner
    • Thank contributors if they invested a large amount of time in contributing
    • Setup a contributor bounty program to encourage participation
    • Fees for money handling

    Thank you to all our backers & sponsors! 🙏

    [Become a backer] [Become a sponsor]

    Support this project by becoming a sponsor. Your logo will show up here with a link to your website.

    License

    See LICENSE.md

    Thanks

    Thanks to Lochlan Wansbrough for the react-native-camera module which provided me with an awesome example of how to set up this module.

    This QR code scanner was inspired by the QR code scanner within Whatsapp.

    Install

    npm i react-native-qrcode-scanner

    DownloadsWeekly Downloads

    25,220

    Version

    1.5.4

    License

    MIT

    Unpacked Size

    36.8 kB

    Total Files

    10

    Last publish

    Collaborators

    • moaazsidat