Swift: How to know the top right and bottom left coordinates of a google map
<p>I need to know the top right and bottom left coordinate in a google map each time the camera is moved. The API gives me the center point of the camera. Is there a way to get what I want with the API or with some algorithm knowing the center point(target), zoom and bearing? </p>

<pre><code>func mapView(mapView: GMSMapView, didChangeCameraPosition position: GMSCameraPosition) {
    position.target
    position.zoom
    position.bearing

}
</code></pre>