MKAnnotation Swift
- All initialization methods in Swift must simply be "init"
- MKAnnotation requires that the object inherit from NSObjectProtocol. To do that, you should have your class inherit from NSObject
- You should declare your properties to match those of the MKAnnotation protocol
- You should not declare your parameters as Implicitly Unwrapped Optionals unless you really have to. Let the compiler check if something is nil instead of throwing runtime errors.
This gives you the result:
class MapPin : NSObject, MKAnnotation { var coordinate: CLLocationCoordinate2D var title: String? var subtitle: String? init(coordinate: CLLocationCoordinate2D, title: String, subtitle: String) { self.coordinate = coordinate self.title = title self.subtitle = subtitle }}