How to count number and which annotations shown on MapView, when zooming?

Question

I need to count number of annotations when i zooming mapView, and get array with which are shown on map, and then, i need to reload my Table and show list of only which shown on map.

How can i get number and array with annotation?

Answer 1

David's great solution in Swift 4

extension MKMapView {
    func visibleAnnotations() -> [MKAnnotation] {
        return self.annotations(in: self.visibleMapRect).map { obj -> MKAnnotation in return obj as! MKAnnotation }
    }
}

Answer 2

As for swift 2.0, I usually use this mapView extension to get all currently visible annotations as an array of MKAnnotations:

extension MKMapView {
    func visibleAnnotations() -> [MKAnnotation] {
        return self.annotationsInMapRect(self.visibleMapRect).map { obj -> MKAnnotation in return obj as! MKAnnotation }
    }
}