How do I move marker along with moving of Google Map in iOS?

Question

I am displaying a marker in a particular place, along with displaying the current address in the address label on Google Maps.

Now, I want to change the location by

Answer 1

There is one trick that can help you out here. Instead of using a GMSMarker here, put an image pointing to the center, over your Google MapView.

You can easily find the coordinates of Map's center using this :

double latitude = mapView.camera.target.latitude;
double longitude = mapView.camera.target.longitude;

Or this

GMSCoordinateBounds *bounds = nil;
bounds = [[GMSCoordinateBounds alloc] initWithRegion: visibleRegion];

CLLocationCoordinate2D centre = CLLocationCoordinate2DMake(
                                                           (bounds.southWest.latitude + bounds.northEast.latitude) / 2,
                                                           (bounds.southWest.longitude + bounds.northEast.longitude) / 2);

Now you can get the location address by using Geocoding API by google.

Here is the reference : https://developers.google.com/maps/documentation/ios-sdk/reference/interface_g_m_s_geocoder

You can refresh Address when this delegate method is called :

- (void) mapView:(GMSMapView *)mapView idleAtCameraPosition:(GMSCameraPosition *)position 

Hope this helps.