QR Code Scanner in swift

In today’s blog let’s see how we can create a QR code scanner in swift.

What is a QR code?

A quick response (QR) code is a type of barcode that can be read easily by a digital device and which stores information as a series of pixels in a square-shaped grid. QR codes are frequently used to track information about products in a supply chain and are often used in marketing and advertising campaigns.

The demo app that we’re going to build is fairly simple and straightforward.

Before we proceed to build the demo app, however, it’s important to understand that any barcode scanning in iOS, including QR code scanning, is totally based on video capture. That’s why the barcode scanning feature is added in the AVFoundation framework. Keep this point in mind, as it’ll help you understand the entire chapter.

Let’s check below the implementation of QR code scanner in swift.

Step1: Firstly, Install SwiftQRScanner pod

pod 'SwiftQRScanner', :git => ‘https://github.com/vinodiOS/SwiftQRScanner’

1	pod 'SwiftQRScanner', :git => ‘https://github.com/vinodiOS/SwiftQRScanner’

Step2: Then, import SwiftQRScanner

#import SwiftQRScanner

1	#import SwiftQRScanner

Step3: Then, create an instance of SwiftQRScanner to scan the QR code.

let scanner = QRCodeScannerController()
scanner.delegate = self
self.present(scanner, animated: true, completion: nil)

let scanner = QRCodeScannerController()

scanner.delegate = self

self.present(scanner, animated: true, completion: nil)

In this step, you will get an error as we have not yet added QRScannerCodeDelegate

To use more features like camera switch, flash, and cancel options you can use the below code:

let scanner = QRCodeScannerController(cameraImage: UIImage(named: "camera"), cancelImage: UIImage(named: "cancel"), flashOnImage: UIImage(named: "flash-on"), flashOffImage: UIImage(named: "flash-off"))
scanner.delegate = self
self.present(scanner, animated: true, completion: nil)

let scanner = QRCodeScannerController(cameraImage: UIImage(named: "camera"), cancelImage: UIImage(named: "cancel"), flashOnImage: UIImage(named: "flash-on"), flashOffImage: UIImage(named: "flash-off"))

scanner.delegate = self

self.present(scanner, animated: true, completion: nil)

Step4: Then, add QRScannerCodeDelegate and confirm to its protocol.

func qrScanner(_ controller: UIViewController, scanDidComplete result: String) {
    print("result:\(result)")
}

func qrScannerDidFail(_ controller: UIViewController, error: String) {
    print("error:\(error)")
}

func qrScannerDidCancel(_ controller: UIViewController) {
    print("SwiftQRScanner did cancel")
}

func qrScanner(_ controller: UIViewController, scanDidComplete result: String) {

print("result:\(result)")

}

func qrScannerDidFail(_ controller: UIViewController, error: String) {

print("error:\(error)")

}

func qrScannerDidCancel(_ controller: UIViewController) {

print("SwiftQRScanner did cancel")

}

Finally, run your code and check results:

Thanks for reading 🙂

For more interesting blogs check out here – https://mobikul.com/blog/

QRCode scanner in iOS QRCode scanner in swift

Shikha Melkani 22 November 2021

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QR Code Scanner in swift

What is a QR code?

Let’s check below the implementation of QR code scanner in swift.

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