Positioning MKMapView to show multiple annotations at once

I've got several annotations I want to add to my MKMapView (it could 0-n items, where n is generally around 5). I can add the annotations fine, but I want to resize the map to fit all annotations onscreen at once, and I'm not sure how to do this. I've been looking at `-regionThatFits:` but I'm not quite sure what to do with it. I'll post some code to show what I've got so far. I think this should be a generally straightforward task but I'm feeling a bit overwhelmed with MapKit so far. ``` - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{ location = newLocation.coordinate; //One location is obtained.. just zoom to that location MKCoordinateRegion region; region.center = location; //Set Zoom level using Span MKCoordinateSpan span; span.latitudeDelta = 0.015; span.longitudeDelta = 0.015; region.span = span; // Set the region here... but I want this to be a dynamic size // Obviously this should be set after I've added my annotations [mapView setRegion:region animated:YES]; // Test data, using these as annotations for now NSArray *arr = [NSArray arrayWithObjects:@"one", @"two", @"three", @"four", nil]; float ex = 0.01; for (NSString *s in arr) { JBAnnotation *placemark = [[JBAnnotation alloc] initWithLat:(location.latitude + ex) lon:location.longitude]; [mapView addAnnotation:placemark]; ex = ex + 0.005; } // What do I do here? [mapView setRegion:[mapView regionThatFits:region] animated:YES]; } ``` Notice, this all happens as I receive a location update... I don't know if that's an appropriate place to do this. If not, where would be a better place? `-viewDidLoad`?