Showing multiple Marker in map - ios

Question

i am making an app with google map it is showing multiple marker on map i want to show only for current location.
//
import UIKit
import GoogleMaps
import GooglePlaces
import GooglePlacePicker
class HomeLocationVC: UIViewController{
#IBOutlet var addressTextField: UITextField!
#IBOutlet var mapViewContainer: UIView!
var locationManager = CLLocationManager()
var currentLocation: CLLocation?
var mapView: GMSMapView!
var placesClient: GMSPlacesClient!
var zoomLevel: Float = 15.0
var likelyPlaces: [GMSPlace] = []
var selectedPlace: GMSPlace?
var camera:GMSCameraPosition?
var marker = GMSMarker()
override func viewDidLoad() {
super.viewDidLoad()
locationManager = CLLocationManager()
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.distanceFilter = 50
locationManager.startUpdatingLocation()
locationManager.delegate = self
placesClient = GMSPlacesClient.shared()
userCurrentLocation()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
#IBAction func searchWIthAddress(_ sender: Any) {
// Prepare the segue.
func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "segueToSelect" {
if let nextViewController = segue.destination as? PlacesViewController {
nextViewController.likelyPlaces = likelyPlaces
}
}
}
}
}
extension HomeLocationVC: CLLocationManagerDelegate {
// Handle incoming location events.
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let location = locations.first{
print("Location: \(location)")
camera = GMSCameraPosition.camera(withLatitude: location.coordinate.latitude,
longitude: location.coordinate.longitude,
zoom: zoomLevel)
if mapView.isHidden {
mapView.isHidden = false
mapView.camera = camera!
} else {
mapView.animate(to: camera!)
}
listLikelyPlaces()
locationManager.stopUpdatingLocation()
}
let position = CLLocationCoordinate2D(latitude: (locations.last?.coordinate.latitude)!, longitude: (locations.last?.coordinate.longitude)!)
marker = GMSMarker(position: position)
marker.title = "Location"
marker.map = self.mapView
// marker.isTappable = true
}
// Handle authorization for the location manager.
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
switch status {
case .restricted:
print("Location access was restricted.")
case .denied:
print("User denied access to location.")
// Display the map using the default location.
mapView.isHidden = false
case .notDetermined:
print("Location status not determined.")
case .authorizedAlways: fallthrough
case .authorizedWhenInUse:
locationManager.startUpdatingLocation()
mapView.isMyLocationEnabled = true
mapView.settings.myLocationButton = true
print("Location status is OK.")
}
}
// Handle location manager errors.
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
locationManager.stopUpdatingLocation()
print("Error: \(error)")
}
}
extension HomeLocationVC: GMSMapViewDelegate{
func mapView(_ mapView: GMSMapView, idleAt position: GMSCameraPosition) {
reverseGeocodeCoordinate(coordinate: position.target)
}
}

Answer 1

Each time func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) is called you ADD a marker. Even by calling locationManager.stopUpdatingLocation() there could still be pending updates.
You should keep a reference to a single marker and update it's position property instead.
so add a stored property to the class
var marker: GSMMarker?
and then each you receive new location updates just update it.
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let position = CLLocationCoordinate2D(latitude: (locations.last?.coordinate.latitude)!, longitude: (locations.last?.coordinate.longitude)!)
if let marker = self.marker {
marker = GMSMarker(position: position)
}
}
Note: there's a stray bracket in your code above, I imagine it will just be a copy error, but its just under locationManager.stopUpdatingLocation() in the func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) function