Hi Claude!
I am going to try to rephrase my problem and also link the QRCodeReaderViewController.swift file below.
Basically i had a button on my app that opens upp a barcode scanner, I could then scan an item and it prints the barcode etc.
My Viewcontroller was getting very full of codes, and i just wanted to create another class to seperate and make my code easier to read. So i put all of the barcodescanner code in the class "Partnyallen" and kept my button in class "NewViewController". I can open the barcode, but as soon as i scan an item or even if i press the "cancel" button inside, it just freezes. I want it to act normal and print out my barcodes etc, basically return the results.
Here comes the QRCodeReaderViewController definition/code.
import UIKit
import AVFoundation
/// Convenient controller to display a view to scan/read 1D or 2D bar codes like the QRCodes. It is based on the `AVFoundation` framework from Apple. It aims to replace ZXing or ZBar for iOS 7 and over.
public class QRCodeReaderViewController: UIViewController {
	private let builder: QRCodeReaderViewControllerBuilder
	/// The code reader object used to scan the bar code.
	public var codeReader: QRCodeReader {
		return builder.reader
	}
	// MARK: - Managing the Callback Responders
	/// The receiver's delegate that will be called when a result is found.
	public weak var delegate: QRCodeReaderViewControllerDelegate?
	/// The completion blocak that will be called when a result is found.
	public var completionBlock: ((QRCodeReaderResult?) -> Void)?
	deinit {
		codeReader.stopScanning()
		NotificationCenter.default.removeObserver(self)
	}
	// MARK: - Creating the View Controller
	/**
	 Initializes a view controller using a builder.
	 - parameter builder: A QRCodeViewController builder object.
	 */
	required public init(builder: QRCodeReaderViewControllerBuilder) {
		self.builder = builder
		super.init(nibName: nil, bundle: nil)
		view.backgroundColor = .black
		codeReader.didFindCode = { [weak self] resultAsObject in
			if let weakSelf = self {
				if let qrv = builder.readerView.displayable as? QRCodeReaderView {
					qrv.addGreenBorder()
				}
				weakSelf.completionBlock?(resultAsObject)
				weakSelf.delegate?.reader(weakSelf, didScanResult: resultAsObject)
			}
		}
		codeReader.didFailDecoding = {
			if let qrv = builder.readerView.displayable as? QRCodeReaderView {
				qrv.addRedBorder()
			}
		}
		setupUIComponentsWithCancelButtonTitle(builder.cancelButtonTitle)
	}
	required public init?(coder aDecoder: NSCoder) {
		self.builder = QRCodeReaderViewControllerBuilder()
		super.init(coder: aDecoder)
	}
	// MARK: - Responding to View Events
	override public func viewWillAppear(_ animated: Bool) {
		super.viewWillAppear(animated)
		if builder.startScanningAtLoad {
			builder.readerView.displayable.setNeedsUpdateOrientation()
			startScanning()
		}
	}
	override public func viewWillDisappear(_ animated: Bool) {
		stopScanning()
		super.viewWillDisappear(animated)
	}
	override public func viewWillLayoutSubviews() {
		super.viewWillLayoutSubviews()
		codeReader.previewLayer.frame = view.bounds
	}
	public override var preferredStatusBarStyle: UIStatusBarStyle {
		return builder.preferredStatusBarStyle ?? super.preferredStatusBarStyle
	}
	// MARK: - Initializing the AV Components
	private func setupUIComponentsWithCancelButtonTitle(_ cancelButtonTitle: String) {
		view.addSubview(builder.readerView.view)
		builder.readerView.view.translatesAutoresizingMaskIntoConstraints = false
		builder.readerView.setupComponents(with: builder)
		// Setup action methods
		builder.readerView.displayable.switchCameraButton?.addTarget(self, action: #selector(switchCameraAction), for: .touchUpInside)
		builder.readerView.displayable.toggleTorchButton?.addTarget(self, action: #selector(toggleTorchAction), for: .touchUpInside)
		builder.readerView.displayable.cancelButton?.setTitle(cancelButtonTitle, for: .normal)
		builder.readerView.displayable.cancelButton?.addTarget(self, action: #selector(cancelAction), for: .touchUpInside)
		// Setup constraints
		for attribute in [.left, .top, .right] as [NSLayoutConstraint.Attribute] {
				NSLayoutConstraint(item: builder.readerView.view, attribute: attribute, relatedBy: .equal, toItem: view, attribute: attribute, multiplier: 1, constant: 0).isActive = true
		}
		
		if #available(iOS 11.0, *) {
				view.safeAreaLayoutGuide.bottomAnchor.constraint(equalTo: builder.readerView.view.bottomAnchor).isActive = true
		}
		else {
				NSLayoutConstraint(item: builder.readerView.view, attribute: .bottom, relatedBy: .equal, toItem: view, attribute: .bottom, multiplier: 1, constant: 0).isActive = true
		}
	}
	// MARK: - Controlling the Reader
	/// Starts scanning the codes.
	public func startScanning() {
		codeReader.startScanning()
	}
	/// Stops scanning the codes.
	public func stopScanning() {
		codeReader.stopScanning()
	}
	// MARK: - Catching Button Events
	@objc func cancelAction(_ button: UIButton) {
		codeReader.stopScanning()
		if let _completionBlock = completionBlock {
			_completionBlock(nil)
		}
		delegate?.readerDidCancel(self)
	}
	@objc func switchCameraAction(_ button: SwitchCameraButton) {
		if let newDevice = codeReader.switchDeviceInput() {
			delegate?.reader(self, didSwitchCamera: newDevice)
		}
	}
	
	@objc func toggleTorchAction(_ button: ToggleTorchButton) {
		codeReader.toggleTorch()
	}
}
