UIView to UIViewController communication via protocol not working

Question

maybe I am missing something really fundamental here, but after staring at the code for an hour or so, my brain is going trough cycles and I would appreciate a fresh glance at this problem.

I have the following UIView:

import UIKit

protocol DetailViewWillShowUpDelegate {
    func sendDetailOpened(_ openedBool: Bool)
}

class locationXIBController: UIView {

    @IBOutlet weak var loationLabel: UILabel!
    @IBOutlet weak var vsedniOteviraciDobaLabel: UILabel!
    @IBOutlet weak var prijmajiKartyLabel: UILabel!
    @IBOutlet weak var detailViewButtonOutlet: UIButton!
    @IBOutlet weak var backgroundViewButton: UIButton!

    let openedBool = true
    var detailViewWillShowUpDelegate: DetailViewWillShowUpDelegate?

    override func awakeFromNib() {
        super.awakeFromNib()
    }

    @IBAction func vecerkaDetailButtonPressed(_ sender: UIButton) {
        detailViewWillShowUpDelegate?.sendDetailOpened(openedBool)
        print("pressed")
    }

    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        if let result = detailViewButtonOutlet.hitTest(convert(point, to: detailViewButtonOutlet), with: event) {
            return result
        }
        return backgroundViewButton.hitTest(convert(point, to: backgroundViewButton), with: event)
    }

}

Now the problem is, that when I call/press the vecerkaDetailButtonPressed function I get "pressed" output in the console but the protocol for some reason doesn't go trough.

The other side looks like this (stripped for simplicity):

class MapViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

    let locationXIB = locationXIBController()
    let isVecerkaDetailOpened = false

    override func viewDidLoad() {
       locationXIB.detailViewWillShowUpDelegate = self
    }



extension MapViewController: DetailViewWillShowUpDelegate {
    func sendDetailOpened(_ openedBool: Bool) {
        isVecerkaDetailOpened = openedBool
        print("success")
    }
}

I know the protocol value at the moment of execution is nil. As I said, any help is appreciated, thanks!

Answer 1

Answer to the credit of @Paulw11

I finally managed to get it working by communicating like so:

step 1) 1:1 communication via protocol between MKAnnotation and MKAnnotationView

step 2) 1:1 communication via protocol between MKAnnotationView and MapViewController passing the same data

Finally works like a charm, thanks!