A simple Swift implementation, if you use outlets.
@IBOutlet weak var mapView: MKMapView! {
didSet {
let noLocation = CLLocationCoordinate2D()
let viewRegion = MKCoordinateRegionMakeWithDistance(noLocation, 500, 500)
self.mapView.setRegion(viewRegion, animated: false)
}
}
Based on @Carnal's answer.