How To Prevent Deselection Of An Annotation Automatically Swift

I've a view with a map inside. I'd like to achieve the following: when the user taps on the map an annotation is displayed and selected (so the callout bubble is shown) until the user taps another point on the map (in this case, the previous annotation should be removed).

The problem is that when I tap on the map the annotation is added and selected for a little time, then somehow it's deselected (so the callout disappears). I want the callout bubble to persist until the user taps on another point

In the following there is my attempt, could anyone help me, please?

@objc func handleTap(_ sender: UITapGestureRecognizer){

    //...some code that computes the country code starting from latitude and longitude

            var countryCurrency = ""

            func countryRequest(countryLabel: String, completion: @escaping (String)->()){
                //api request that receives the currency name of the country
                completion(countryCurrency)
            }
            countryRequest(countryLabel: countryLabel){ countryCurrency in

                DispatchQueue.main.async {

                    let locat:CLLocationCoordinate2D = CLLocationCoordinate2DMake(locationCoord.latitude, locationCoord.longitude)
                    let annotation = MKPointAnnotation()
                    annotation.coordinate = locat
                    annotation.title = countryCurrency
                    annotation.subtitle = "subtitle"
                    self.mapView.addAnnotation(annotation)
                    self.mapView.selectAnnotation(annotation, animated: true)

                }

            }
}

I also have an extension of the MKMapViewDelegate to customise the callout:

extension MapsItem: MKMapViewDelegate {

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {

    if !(annotation is MKPointAnnotation){
        return nil
    }

    var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: "demo")
    if annotationView == nil {
        annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "demo")
        annotationView!.canShowCallout = true
        annotationView!.sizeToFit()
    }
    else{
        annotationView!.annotation = annotation
    }

    return annotationView

}
}

Thanks in advance!!

Try this

set isTappingNow to true before adding annotation and to false after selecting it

   func mapView(_ mapView: MKMapView, didDeselect view: MKAnnotationView)
   {

      if(!isTappingNow)
      {

           self.mapView.selectAnnotation(view.annotation, animated: false)
      } 

    }