Nrthugu

I add places using a longtapgesture recognizer and while it shows on my map, it dissapears when i leave the view and then comeback.

so I'm adding the locations using firebase fetching the location and I want it to show on my mapview.
I'm getting the values on snapshot.value and i'm trying to showcase on my mapview, please help me. this is the last step that I can't seem to figure out.

 func fetchlocations() {

    let ref = Database.database().reference()

    ref.child("Map").observe(.value) { (snapshot) in

        print(snapshot.value)



        let activity = (snapshot.value as AnyObject!)!["activity"] as? String?

        let lat = (snapshot.value as AnyObject!)!["lat"] as? String?

        let long = (snapshot.value as AnyObject!)!["long"] as? String?



        let annotation = MKPointAnnotation()

        annotation.coordinate = CLLocationCoordinate2D(latitude: (Double(lat!))!, longitude: (Double(long!))!)

        annotation.title = activity

        self.mapView?.addAnnotation(annotation)

    }

}