How to remove two annotation on the same spot? - ios

Question

I would like to have only one annotation on a spot with title and subtitle. I am facing the problem that i get two annotations. The default annotation and may custom annotation. I want only the custom annotation.
The main methods to look after are probably: addAnnotation and the delegate methods.
Here is picture of the problem:
enter image description here
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController {
let locationManager = CLLocationManager()
let regionInMeters: Double = 10000
let localMap: MKMapView = {
let map = MKMapView()
map.translatesAutoresizingMaskIntoConstraints = false
return map
}()
override func viewDidLoad() {
super.viewDidLoad()
setupUI()
checkLocationService()
addAnnotations()
}
private func setupUI() {
setupConstraints()
}
}
// MARK: constraints
extension ViewController {
private func setupConstraints() {
view.addSubview(localMap)
NSLayoutConstraint.activate([
localMap.topAnchor.constraint(equalTo: view.topAnchor),
localMap.leadingAnchor.constraint(equalTo: view.leadingAnchor),
localMap.trailingAnchor.constraint(equalTo: view.trailingAnchor),
localMap.bottomAnchor.constraint(equalTo: view.bottomAnchor),
])
}
}
extension ViewController: CLLocationManagerDelegate, MKMapViewDelegate {
// checking location service is available
private func checkLocationService() {
if CLLocationManager.locationServicesEnabled() {
setupLocationManager()
checkLocationAuthorization()
} else {
}
}
private func checkLocationAuthorization() {
switch CLLocationManager.authorizationStatus() {
case .authorizedWhenInUse:
print("Yesss")
localMap.showsUserLocation = true
centerViewOnUserLocation()
//locationManager.startUpdatingLocation()
break
case .denied:
break
case .notDetermined:
locationManager.requestWhenInUseAuthorization()
break
case .restricted:
break
case .authorizedAlways:
break
#unknown default:
fatalError()
}
}
private func setupLocationManager() {
localMap.delegate = self
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
}
private func centerViewOnUserLocation() {
if let location = locationManager.location?.coordinate {
let region = MKCoordinateRegion(center: location, latitudinalMeters: regionInMeters, longitudinalMeters: regionInMeters)
localMap.setRegion(region, animated: true)
}
}
// Delegate methods
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
guard let location = locations.last else { return }
let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
let region = MKCoordinateRegion(center: center, latitudinalMeters: regionInMeters, longitudinalMeters: regionInMeters)
localMap.setRegion(region, animated: true)
}
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
checkLocationAuthorization()
}
// MARK: annotation
private func addAnnotations() {
let restaurantAnnotation = MKPointAnnotation()
restaurantAnnotation.title = "FOOD BROTHER"
restaurantAnnotation.subtitle = "Best burger in town"
restaurantAnnotation.coordinate = CLLocationCoordinate2D(latitude: 52.37085, longitude: 9.732710)
localMap.addAnnotation(restaurantAnnotation)
}
// https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=2ahUKEwijvYel7NTlAhVMjqQKHWeiChAQFjAAegQICBAB&url=https%3A%2F%2Fstackoverflow.com%2Fquestions%2F49020023%2Fmapkit-annotations-disappearing&usg=AOvVaw2G13fjRVWs3b49cLQTjG_I
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
let reuseIdentifier = "annotationView"
if annotation is MKUserLocation {
return nil
}
var view = mapView.dequeueReusableAnnotationView(withIdentifier: reuseIdentifier)
if #available(iOS 11.0, *) {
if view == nil {
view = MKMarkerAnnotationView(annotation: annotation, reuseIdentifier: reuseIdentifier)
}
view?.displayPriority = .required
} else {
if view == nil {
view = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseIdentifier)
}
}
let pinImage = UIImage(named: "restaurantsIcon.png")
let size = CGSize(width: 50, height: 50)
UIGraphicsBeginImageContext(size)
pinImage!.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))
let resizedImage = UIGraphicsGetImageFromCurrentImageContext()
view?.image = resizedImage
view?.annotation = annotation
view?.canShowCallout = true
return view
}
}

Answer 1

I found another approach to tackle that problem.
Here it is:
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
let reuseIdentifier = "annotationView"
if annotation is MKUserLocation {
return nil
}
var view = MKMarkerAnnotationView(annotation: annotation, reuseIdentifier: reuseIdentifier)
view.glyphImage = UIImage(named: "restaurantsIcon")
view.markerTintColor = .systemPink
view.displayPriority = .required
view.annotation = annotation
view.canShowCallout = true
return view
}