Marker events and gestures

When specific advanced marker properties are set, you can monitor marker events such as taps and gestures. If a marker is tapped, one can see additional information such as a marker title or snippet. One can also move draggable markers using a long press gesture.

• To track marker events, add the GMSMapViewDelegate to your view.
• To make a marker draggable, set the GMSMarker.draggable property.
• To set descriptive text for a marker, use the GMSMarker.title property.

Respond to marker events

You can respond to marker events by adding the GMSMapViewDelegate protocol to your view and implementing the corresponding callback. This example identifies the title and snippet for a selected marker.

Swift

// MARK: GMSMapViewDelegate

func mapView(_ mapView: GMSMapView, didTap marker: GMSMarker) -> Bool {
  if let title = marker.title {
    if let snippet = marker.snippet {
      print("marker title: \(title): snippet: \(snippet)")
    }
  }
  return true
}

Objective-C

// MARK: GMSMapViewDelegate

-   (BOOL)mapView:(GMSMapView *)mapView didTapMarker:(GMSMarker *)marker {
  if (marker.title && marker.snippet) {
    NSLog(@"marker with title:%@ snippet: %@", marker.title,  marker.snippet)
  }
  return YES;
}

Control marker visibility by map zoom level

To control the visibility of GMSMarker, implement the GMSMapViewDelegate protocol and add a condition to set GMSMarker.map.

Swift

// MARK: GMSMapViewDelegate

func mapView(_ mapView: GMSMapView, didChange position: GMSCameraPosition) {
    marker.map = position.zoom >= 14 ? mapView : nil
}

Objective-C

// MARK: GMSMapViewDelegate

-   (void)mapView:(GMSMapView *)mapView didChangeCameraPosition:(GMSCameraPosition *)position {
  marker.map = position.zoom >= 14 ? mapView : nil;
}

Make a marker draggable

When you enable the draggable property users can drag markers on the map with a long press gesture. To make a marker draggable, set the GMSMarker.draggable property to true.

Swift

marker.draggable = true

Objective-C

marker.draggable = YES;