I want the button in annotation to always appear - swift

Question

The application I developed creates an annotation on the map when pressed and held. When this annotation is touched, the button and other information appear. But I want the button and other information to appear directly (without touching it). And I don't know that how to use the button.
import UIKit
import MapKit
import CoreLocation
class choosingVC: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate{
var locationManager = CLLocationManager()
#IBOutlet weak var mapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
mapView.delegate = self
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
let gestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(ChooseLocation(gestureRecognizer:)))
gestureRecognizer.minimumPressDuration = 2
mapView.addGestureRecognizer(gestureRecognizer)
}
#objc func ChooseLocation(gestureRecognizer:UILongPressGestureRecognizer){
if gestureRecognizer.state == .began {
let touchPoint = gestureRecognizer.location(in: mapView)
let touchCoordinate = mapView.convert(touchPoint, toCoordinateFrom: mapView)
let annotation = MKPointAnnotation()
annotation.coordinate = touchCoordinate
annotation.title = "seçitiğiniz bölge"
annotation.subtitle = "örnek"
mapView.addAnnotation(annotation)
}
}
//annotation artı butonu ekledik.
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
if !(annotation is MKUserLocation) {
let pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: String(annotation.hash))
let rightButton = UIButton(type: .contactAdd)
rightButton.tag = annotation.hash
pinView.animatesDrop = true
pinView.canShowCallout = true
pinView.rightCalloutAccessoryView = rightButton
return pinView
}
else {
return nil
}
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = CLLocationCoordinate2D(latitude: locations[0].coordinate.latitude, longitude: locations[0].coordinate.longitude)
let span = MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1)
let region = MKCoordinateRegion(center: location, span: span)
mapView.setRegion(region, animated: true)
}
}