Fungerande QR-kodscanner

//
//  ViewController.swift
//  QRCodeTEst
//
//  Created by Mikael Grön on 2023-03-01.
//

import UIKit
import AVFoundation

class ViewController: UIViewController {
    var captureSession = AVCaptureSession()
    var videoPreviewLayer:AVCaptureVideoPreviewLayer?

    override func viewDidLoad() {
        super.viewDidLoad()

        print("viewDidLoad")

        let discoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInDualCamera, .builtInTelephotoCamera, .builtInTripleCamera, .builtInDualWideCamera, .builtInUltraWideCamera], mediaType: .video, position: .back)

        guard let captureDevice = discoverySession.devices.first else {
            print("No device found")
            return
        }

        do {
            let input = try AVCaptureDeviceInput(device: captureDevice)
            captureSession.addInput(input)

            let videoMetaDataOutput = AVCaptureMetadataOutput()
            captureSession.addOutput(videoMetaDataOutput)

            videoMetaDataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)

            videoMetaDataOutput.metadataObjectTypes = [.qr]

            videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
            videoPreviewLayer?.videoGravity = .resizeAspectFill
            videoPreviewLayer?.frame = view.layer.bounds

            view.layer.addSublayer(videoPreviewLayer!)

            captureSession.startRunning()

            print("all done!")

        } catch {
            print(error)
            return
        }

    }


}

extension ViewController: AVCaptureMetadataOutputObjectsDelegate {
    func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
        print("Count: \(metadataObjects.count)")
    }
}