cllocationdistance

I have an array of annotations.I am calculating the distance between each annotation from user location.What I want to know is, how can I find lets say 3 nearest annotations from these distances? Here is how I am calculating distance from user location to annotations. CLLocation *userLocation = self.mapView.userLocation.location; for (Annotation *obj in annotations) { CLLocation *loc = [[CLLocation alloc] initWithLatitude:obj.coordinate.latitude longitude:obj.coordinate.longitude]; // CLLocation *userLocation = [[CLLocation alloc] initWithLatitude:self.mapView.userLocation.coordinate.latitude

I have an array full of longitudes and latitudes. I have two double variables with my users location. I'd like to test the distance between my user's locations against my array to see which location is the closest. How do I do this? This will get the distance between 2 location but stuggeling to understand how I'd test it against an array of locations. CLLocation *startLocation = [[CLLocation alloc] initWithLatitude:userlatitude longitude:userlongitude]; CLLocation *endLocation = [[CLLocation alloc] initWithLatitude:annotation.coordinate.latitude longitude:annotation.coordinate.longitude];

MapKit's built in function MKCoordinateRegionMakeWithDistance takes distances in meters and turns them into a MKCoordinateRegion : func MKCoordinateRegionMakeWithDistance( _ centerCoordinate: CLLocationCoordinate2D, _ latitudinalMeters: CLLocationDistance, _ longitudinalMeters: CLLocationDistance) -> MKCoordinateRegion is there a reverse function that takes a MKCoordinateRegion and gives me latitudinalMeters and longitudinalMeters? MKCoordinateRegion gives a center (latitude and longitude) and span (delta latitude and longitude). Given these values, you can determine the location of the edges