swift-sample-region-notification-1.swift

override func viewDidLoad() {
    super.viewDidLoad()
    
    // setup Map View on User Location
    let noLocation = CLLocationCoordinate2D()
    let span = MKCoordinateSpan(latitudeDelta: 0.001, longitudeDelta: 0.001)
    let viewRegion = MKCoordinateRegion(center: noLocation, span: span)
    
    mapView.delegate = self
    mapView.region = viewRegion
    mapView.showsUserLocation = true
    mapView.userTrackingMode = .follow
}