Swift - GoogleMaps SDK get coordinates on touch - swift

Question

I am new to swift and the Google Maps SDK, and was wondering how to get the coordinates of where the user has tapped using the Google Maps SDK. For example if a user holds their finger down on a certain place on a map, a annotation is created there. I would really appreciate your help, thanks.

Answer 1

In the GMSMapViewDelegate there is a method named: mapView:didLongPressAtCoordinate: which is called after a long-press gesture at a particular coordinate. See the reference here.
By implementing this method you could then add a marker to the map view:
func mapView(mapView: GMSMapView!, didLongPressAtCoordinate coordinate: CLLocationCoordinate2D) {
let marker = GMSMarker(position: coordinate)
marker.title = "Hello World"
marker.map = mapView
}
For a tap gesture a similar delegate method can be implemented called mapView:didTapAtCoordinate: which can be used in a similar way:
func mapView(mapView: GMSMapView!, didTapAtCoordinate coordinate: CLLocationCoordinate2D) {
print("Tapped at coordinate: " + String(coordinate.latitude) + " "
+ String(coordinate.longitude))
}

Answer 2

Try this
extension ViewController: GMSMapViewDelegate {
func mapView(_ mapView: GMSMapView, didTapAt coordinate: CLLocationCoordinate2D)
{
print("Tapped at coordinate: " + String(coordinate.latitude) + " "
+ String(coordinate.longitude))
}
}

Answer 3

For Swift 5.0+
First, make sure you have added GMSMapViewDelegate delegate to your ViewController Class
Add this default function in your class
func mapView(_ mapView: GMSMapView, didLongPressAt coordinate: CLLocationCoordinate2D) {
debugPrint("Coordinates: ", coordinate)
}
If you just want coordinates, then above function is perfect for you But if you want to create Marker or get local address from touch then see below function
func mapView(_ mapView: GMSMapView, didLongPressAt coordinate: CLLocationCoordinate2D) {
let marker = GMSMarker(position: coordinate) //Add this line if you want to add marker
let decoder = CLGeocoder()
decoder.reverseGeocodeLocation(CLLocation(latitude: coordinate.latitude, longitude: coordinate.longitude)) { placemarks, err in
if let placeMark = placemarks?.first {
let plName = placeMark.name ?? placeMark.subThoroughfare ?? placeMark.thoroughfare! //Place Name
var address : String! = "" //This will be the local address
if let subLocality = placeMark.subLocality ?? placeMark.name {
address.append(subLocality)
address.append(", ")
}
if let city = placeMark.locality ?? placeMark.subAdministrativeArea {
address.append(city)
address.append(", ")
}
if let state = placeMark.administrativeArea, let country = placeMark.country {
address.append(state)
address.append(", ")
address.append(country)
}
// Add Marker:
marker.title = plName
marker.snippet = address
marker.appearAnimation = .pop
marker.map = mapView
}
}
}
This Function does not only get coordinates but creates a Marker with all the details fetched from the coordinates(Like PlaceName, city, state,country etc.) too
If you just want local address, then remove all the code lines related to marker
The reason why i have used CLGeocoder and not GMSGeocoder from
GoogleMapDelegate is that Apple's CLGeocoder is much more precise
in getting the place-name while GMSGeocoder does not fetch
place-name accurately.
Also Note that : Apple's Geocoding requests are rate-limited for each app, so making too many requests in a short period of time may
cause some of the requests to fail.