By default, points of interest (POIs) appear on the base map along with their
corresponding icons. POIs include parks, schools, government buildings, and
more. In addition, business POIs appear by default on the map when the map
type is kGMSTypeNormal
. Business POIs represent businesses such as shops,
restaurants, hotels, and more.
A POI corresponds to a Place ID, as defined in the Places SDK for iOS. For example, recreational parks are POIs, but things like water fountains are generally not POIs (unless they're of national or historic significance).
Listening for click events on POIs
If you want to respond to a user tapping on a POI, implement GMSMapViewDelegate
, and implement the
mapView(_:didTapPOIWithPlaceID:name:location:)
method, as shown in the following example:
Swift
import GoogleMaps class POI: UIViewController, GMSMapViewDelegate { override func loadView() { let camera = GMSCameraPosition.camera( withLatitude: 47.603, longitude:-122.331, zoom:14 ) let mapView = GMSMapView.map(withFrame: .zero, camera: camera) mapView.delegate = self self.view = mapView } func mapView( _ mapView: GMSMapView, didTapPOIWithPlaceID placeID: String, name: String, location: CLLocationCoordinate2D ) { print("You tapped \(name): \(placeID), \(location.latitude)/\(location.longitude)") } }
Objective-C
#import "POI.h" @import GoogleMaps; @interface POI () <GMSMapViewDelegate> @end @implementation POI - (void)loadView { GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:47.603 longitude:-122.331 zoom:14]; GMSMapView *mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera]; mapView.delegate = self; self.view = mapView; } #pragma mark - GMSMapViewDelegate - (void)mapView:(GMSMapView *)mapView didTapPOIWithPlaceID:(NSString *)placeID name:(NSString *)name location:(CLLocationCoordinate2D)location { NSLog(@"You tapped %@: %@, %f/%f", name, placeID, location.latitude, location.longitude); } @end
Showing details in an info window
POIs appear on the map by default, but there is no default on-click UI (the API does not automatically display an info window or any other user interface when the user taps a POI). The following example shows how to use a marker to display an info window for a POI:
Swift
// Declare GMSMarker instance at the class level. let infoMarker = GMSMarker() // Attach an info window to the POI using the GMSMarker. func mapView( _ mapView: GMSMapView, didTapPOIWithPlaceID placeID: String, name: String, location: CLLocationCoordinate2D ) { infoMarker.snippet = placeID infoMarker.position = location infoMarker.title = name infoMarker.opacity = 0; infoMarker.infoWindowAnchor.y = 1 infoMarker.map = mapView mapView.selectedMarker = infoMarker }
Objective-C
// Declare a GMSMarker instance at the class level. GMSMarker *infoMarker; // Attach an info window to the POI using the GMSMarker. - (void)mapView:(GMSMapView *)mapView didTapPOIWithPlaceID:(NSString *)placeID name:(NSString *)name location:(CLLocationCoordinate2D)location { infoMarker = [GMSMarker markerWithPosition:location]; infoMarker.snippet = placeID; infoMarker.title = name; infoMarker.opacity = 0; CGPoint pos = infoMarker.infoWindowAnchor; pos.y = 1; infoMarker.infoWindowAnchor = pos; infoMarker.map = mapView; mapView.selectedMarker = infoMarker; }
Stopping POIs from showing on the map
You can hide POIs by applying custom styles to all POIs or to specific categories of POIs.
The following JSON style declaration hides all business POIs on the map:
[
{
"featureType": "poi.business",
"stylers": [
{ "visibility": "off" }
]
}
]
As another example, the following JSON simplifies the display of all categories of POIs:
[
{
"featureType": "poi",
"stylers": [
{ "visibility": "simplified" }
]
}
]
For more details, see the guide to hiding map features with styling.