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@nfarshchi
Created February 19, 2018 22:12
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Binary/Raw data from QR Code scanning with swift 4.0 by AVFoundation.
//
// QRScanVC.swift
//
// Created by Farshchi, Navid on 1/2/18.
//
import UIKit
import AVFoundation
class QRScanVC: UIViewController, AVCaptureMetadataOutputObjectsDelegate {
//The camera preview frame
@IBOutlet weak var previewFrame: UIView!
var videoCaptureDevice = AVCaptureDevice.default(for: .video)
var device = AVCaptureDevice.default(for: .video)
var output = AVCaptureMetadataOutput()
var previewLayer: AVCaptureVideoPreviewLayer?
var captureSession = AVCaptureSession()
var code: String?
override func viewDidLoad() {
super.viewDidLoad()
self.setupCamera()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
}
private func setupCamera() {
do {
let input = try AVCaptureDeviceInput(device: videoCaptureDevice!)
if self.captureSession.canAddInput(input) {
self.captureSession.addInput(input)
}
self.previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
if let videoPreviewLayer = self.previewLayer {
videoPreviewLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill
videoPreviewLayer.frame = self.previewFrame.bounds
self.previewFrame.layer.addSublayer(videoPreviewLayer)
}
let metadataOutput = AVCaptureMetadataOutput()
if self.captureSession.canAddOutput(metadataOutput) {
self.captureSession.addOutput(metadataOutput)
metadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
metadataOutput.metadataObjectTypes = [AVMetadataObject.ObjectType.upce, AVMetadataObject.ObjectType.code39, AVMetadataObject.ObjectType.code39Mod43, AVMetadataObject.ObjectType.ean13, AVMetadataObject.ObjectType.ean8, AVMetadataObject.ObjectType.code93, AVMetadataObject.ObjectType.code128, AVMetadataObject.ObjectType.pdf417, AVMetadataObject.ObjectType.qr, AVMetadataObject.ObjectType.aztec]
} else {
print("Could not add metadata output")
}
} catch {
print("Error while setting camera")
}
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// This if for start capture session again while the VC become visible
if (captureSession.isRunning == false) {
captureSession.startRunning();
}
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
// This if for stopping capture session while the VC is not visible
if (captureSession.isRunning == true) {
captureSession.stopRunning();
}
}
func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
print(metadataObjects)
for metadataObject in metadataObjects {
print("type: " + metadataObject.type.rawValue)
let readableObject = metadataObject as! AVMetadataMachineReadableCodeObject;
let rawReadableObjectTemp = readableObject.value(forKeyPath: "_internal.basicDescriptor")! as! [String:Any]
let rawReadableObject = rawReadableObjectTemp["BarcodeRawData"] as? Data
if let rawBytes = rawReadableObject {
print(rawBytes)
let dataString = rawBytes.hexEncodedString()
print("dataString: \(dataString)")
}
}
}
}
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