How to get coordinate center of gmsmapview in iphone

Are you looking for mapView.camera.target? This is a CLLocationCoordinate2D.

Here is how to do it in Swift 4

let coordinate = mapView.projection.coordinate(for: mapView.center)

Use the projection method - (CLLocationCoordinate2D)coordinateForPoint:(CGPoint)pointof the mapview to convert a point in the map to the geological coordinates

CGPoint point = mapView.center;
CLLocationCoordinate2D coor = [mapView.projection coordinateForPoint:point];

I suggest to use [yourMapView.camera target] instead of Jing's solution.

Jing's solution work fine on iOS 6, but maybe having issue on iOS 7/7.1, the projection may report wrong coordinate (a bit downward shift) ! I have checked the map bounds and padding is correct, both result of [projection pointForCoordinate: coordinate] and [projection coordinateForPoint:point] can contrast to each other, no ideas where the problem is...