Generation of QR Code in React Native
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-qrcode package, which will provide <QRCode/> component to make QRCode.
QR Code is known as Quick Response Code is a trademark for two-dimensional barcode. QR Code is a machine/camera readable block enabled code for encoding numeric value and alphabetic value. The QR Code stores information within a block of images and can store multiple types of information.
Render Using
1 2 3 4 5 6 7 8 9 10 | <QRCode value={this.state.valueForQRCode} //Setting the value of QRCode size={250} //Size of QRCode bgColor="#000" //Backgroun Color of QRCode fgColor="#fff" //Front Color of QRCode /> |
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 init to make our React Native App. Assuming that you have node installed, you can use npm to install thereact-native-cli command line utility.
Open the terminal and go to the workspace and runnpm install -g react-native-clireact-native init ProjectNameInstallation of Dependency
To use <QRCode /> we need to install react-native-qrcode package. To install this
Open the terminal and jump into your project
1 | cd ProjectName |
Run the following command.
1 | npm install react-native-qrcode --save |
This command will copy all the dependencies into your node_module directory, You can find the directory in node_module the directory named react-native-qrcode.
–save is optional, it is just to update the react-navigation dependancy in your package.json file.
Dependency Version for this Example Used is
1 | "react-native-qrcode": "0.2.7" |
Now Open App.js in any code editor and replace the code with the following code.
App.js
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | //This is an example code to generate QR code// import React, { Component } from 'react'; //import react in our code. import { StyleSheet, View, TextInput, TouchableOpacity, Text,} from 'react-native'; // import all basic components import QRCode from 'react-native-qrcode'; //import QRCode class App extends Component { constructor() { super(); this.state = { inputValue: '', // Default Value of the TextInput valueForQRCode: '', // Default value for the QR Code }; } getTextInputValue = () => { // Function to get the value from input // and Setting the value to the QRCode this.setState({ valueForQRCode: this.state.inputValue }); }; render() { return ( <View style={styles.MainContainer}> <QRCode value={this.state.valueForQRCode} //Setting the value of QRCode size={250} //Size of QRCode bgColor="#000" //Backgroun Color of QRCode fgColor="#fff" //Front Color of QRCode /> <TextInput // Input to get the value to set on QRCode style={styles.TextInputStyle} onChangeText={text => this.setState({ inputValue: text })} underlineColorAndroid="transparent" placeholder="Enter text to Generate QR Code" /> <TouchableOpacity onPress={this.getTextInputValue} activeOpacity={0.7} style={styles.button}> <Text style={styles.TextStyle}> Generate QR Code </Text> </TouchableOpacity> </View> ); } } export default App; const styles = StyleSheet.create({ MainContainer: { flex: 1, margin: 10, alignItems: 'center', paddingTop: 40, }, TextInputStyle: { width: '100%', height: 40, marginTop: 20, borderWidth: 1, textAlign: 'center', }, button: { width: '100%', paddingTop: 8, marginTop: 10, paddingBottom: 8, backgroundColor: '#F44336', marginBottom: 20, }, TextStyle: { color: '#fff', textAlign: 'center', fontSize: 18, }, }); |
To Run the React Native App
Open the terminal again and jump into your project using.cd ProjectNamereact-native run-androidreact-native run-ios (macOS only).
That was the React Native Generate QR Code. If you have any doubt or you want to share something about the topic you can comment below or contact us here. There will be more posts coming soon. Stay tuned!
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