maps navigation change annotation title & coordinates

i have a lot of annotations on a map and a link inside each annotationcallout, which forwards the user to the native mapsapp for a navigation process.

i created my link in here:

    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        guard let annot = annotation as? customAnnotation else { return nil }

        if annotation is MKUserLocation {
            return nil
        }
        
        let annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "customAnnotation")
        annotationView.image = UIImage(named: annot.icon)
        annotationView.canShowCallout = true
        
        let rightButton = UIButton(type: .detailDisclosure)
        rightButton.setImage(UIImage(named: annot.isCollapsed ? "ic_showmore" : "ic_showless"), for: .normal)
        annotationView.rightCalloutAccessoryView = rightButton
        
        if (annot.isCollapsed) {
            annotationView.detailCalloutAccessoryView = nil
        }
        else {
            //create NavigationButton
            let naviButton = UIButton(type: UIButtonType.custom) as UIButton
            naviButton.setTitle(annot.address, for: .normal)
            naviButton.setTitleColor(.black, for: .normal)
            naviButton.titleLabel?.numberOfLines = 0
            naviButton.titleLabel?.font = UIFont.italicSystemFont(ofSize: 14.0)
            naviButton.frame = CGRect(x: 0, y: 0, width: 200, height: 21)
            naviButton.backgroundColor = .white
            naviButton.addTarget(self, action: #selector(naviButtonAction), for: .touchUpInside)
            annotationView.detailCalloutAccessoryView = naviButton
            
            naviButton.widthAnchor.constraint(lessThanOrEqualToConstant: naviButton.frame.width).isActive = true
            naviButton.heightAnchor.constraint(lessThanOrEqualToConstant: 90.0).isActive = true
        }
        return annotationView
}

and my "naviButtonAction" here:

@objc func naviButtonAction(sender: UIButton) {
        
        let latitude: CLLocationDegrees = 48.147989
        let longitude: CLLocationDegrees = 11.617287
        
        let regionDistance: CLLocationDistance = 1000;
        let coordinates = CLLocationCoordinate2DMake(latitude, longitude)
        let regionSpan = MKCoordinateRegionMakeWithDistance(coordinates, regionDistance, regionDistance)
        
        let options = [MKLaunchOptionsMapCenterKey: NSValue(mkCoordinate: regionSpan.center), MKLaunchOptionsMapSpanKey: NSValue(mkCoordinateSpan: regionSpan.span)]
        
        let placemark = MKPlacemark(coordinate: coordinates)
        let mapItem = MKMapItem(placemark: placemark)
        mapItem.name = "B"
        mapItem.openInMaps(launchOptions: options)
        
    }

now i want the coordinates and the title to change depending on the annotation the user has clicked. The question is just how?

i tried a little bit and never got a useful result, so i looked if my @objc func naviButtonAction can actually view the coordinates and title and tried printing them, but all it returned was "nil".

The title, coordinates, etc. where created for each annotation inside this for-loop in my override func viewDidLoad:

        for location in locations {
            let annotation = customAnnotation()
            annotation.title = location.title
            annotation.address = location.address
            annotation.oHour = location.oHour
            annotation.oMin = location.oMin
            annotation.cHour = location.cHour
            annotation.cMin = location.cMin
            annotation.coordinate = CLLocationCoordinate2D (latitude: location.latitude, longitude: location.longitude)

Any ideas why i cant call the title and how i can solve this?

Thanks a lot,

Gus