class MyMapAnnotation : NSObject, MKAnnotation {

    let title: String
    let subtitle: String
    let coordinate: CLLocationCoordinate2D

    init(title: String, subtitle: String, coordinate: CLLocationCoordinate2D) {
        self.title = title
        self.subtitle = subtitle
        self.coordinate = coordinate
    }
}

let coordinate = CLLocationCoordinate2D(latitude: 46.830930, longitude: 7.705106)
let annotation = MyMapAnnotation(title: "Title", subtitle: "Subtitle", coordinate: coordinate)

if CLLocationCoordinate2DIsValid(coordinate) {
    map.addAnnotation(annotation)
}