Change MKMapView's Zoom - Swift 4 - ios

Question

I using Apple's MapKit and MKMapView to show a location on screen. The function I am using is:
func displayLocation() {
locationMap.setRegion(MKCoordinateRegion(center: CLLocationCoordinate2DMake(userConnected.siteConnectedLat!, userConnected.siteConnectedLong!), span: MKCoordinateSpanMake(0.05, 0.05)), animated: true)
let locationPin = CLLocationCoordinate2D(latitude: userConnected.siteConnectedLat!, longitude: userConnected.siteConnectedLong!)
let annotation = MKPointAnnotation()
annotation.coordinate = locationPin
locationMap.addAnnotation(annotation)
locationMap.showAnnotations([annotation], animated: true)
}
Is is then called in the viewDidLoad method of the View Controller. Apple's documentation says that the span should change the zoom but even changing the span is putting minimum effect on the map. I want it to be zoomed out enough so that we can clearly see like 3-4 European countries, i.e, a significant amount of zoom-out.
This is what my map looks like in simulator:
This is how it looks like after I press enlarge:

Answer 1

You need to set the region of the map in viewDidAppear, not viewDidLoad. When viewDidLoad is called, the map view has just been loaded - the map hasn't been rendered yet, so you can't set its region.
Another thing to change is the span. (0.05, 0.05) seems too small a span to show 3-4 countries. You should try something bigger, like (5, 5). Remember that these numbers represent in degrees the width and height of the map region.