Center a MKMapView given a GeoJSON bounding box

gistfile1.m

            double lng1 = [bbox[0] doubleValue];
            double lat1 = [bbox[1] doubleValue];
            double lng2 = [bbox[2] doubleValue];
            double lat2 = [bbox[3] doubleValue];
 
            MKCoordinateSpan span;
            span.latitudeDelta = fabs(lat2 - lat1);
            span.longitudeDelta = fabs(lng2 - lng1);
 
            CLLocationCoordinate2D center;
            center.latitude = fmax(lat1, lat2) - (span.latitudeDelta / 2.0);
            center.longitude = fmax(lng1, lng2) - (span.longitudeDelta / 2.0);
 
            MKCoordinateRegion region;
            region.span = span;
            region.center = center;
 
            [self.mapView setRegion:region animated:NO];

Hey, just ran across this while working on a project. I need to go the opposite direction, but this was a nice help. Thanks Aaron!