Google Maps for iOS - How can you tell if a marker is within the bounds of the screen?

Question

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 there doesn't seem to be a way.

Answer 1

The swift 4 version of the answer. Returning a boolean if marker is within the screen region or not

func isMarkerWithinScreen(marker: GMSMarker) -> Bool {
    let region = self.mapView.projection.visibleRegion()
    let bounds = GMSCoordinateBounds(region: region)
    return bounds.contains(marker.position)
}

Answer 2

A code example based on Andy's helpful response:

- (void)snapToMarkerIfItIsOutsideViewport:(GMSMarker *)m{
    GMSVisibleRegion region = _mapView.projection.visibleRegion;
    GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc] initWithRegion:region];
    if (![bounds containsCoordinate:m.position]){
        GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:m.position.latitude
                                              longitude:m.position.longitude
                                                   zoom:_mapView.camera.zoom];
        [self.mapView animateToCameraPosition: camera];
    }
}