I'm trying to figure out a straightforward way to determine in Google Maps for iOS if a given GMSMarker is within the bounds of the visible map. There seems to be solutions for this in the Javascript API but other than perhaps doing some complex reasoning based on [this post](https://stackoverflow.com/questions/15317359/google-maps-ios-sdk-how-do-i-get-accurate-latitude-and-longitude-coordinates-fr) there doesn't seem to be a way.