convenience init!(centerCoordinate coord: CLLocationCoordinate2D, radius radius: CLLocationDistance)

let center = CLLocationCoordinate2D(
        latitude: mapView.userLocation.coordinate.latitude,
        longitude: mapView.userLocation.coordinate.longitude)

let rad = CLLocationDistance(1000)

convenience init!(coord: CLLocationCoordinate2D, radius: CLLocationDistance){
            self.init(radius: rad)
            self.init(coord: center)
    }

convenience init!(centerCoordinate coord: CLLocationCoordinate2D, radius radius: CLLocationDistance)

MKCircle(centerCoordinate coord: CLLocationCoordinate2D, radius: CLLocationDistance)

let center = CLLocationCoordinate2D(
latitude: mapView.userLocation.coordinate.latitude,
longitude: mapView.userLocation.coordinate.longitude)

let rad = CLLocationDistance(1000)

MKCircle(centerCoordinate: center, radius: rad)