How TO Work MKAnotation In Swift Ios 

func mapView(mapView: MKMapView!, annotationView view: 
 MKAnnotationView!, didChangeDragState newState: 
 MKAnnotationViewDragState, fromOldState oldState: 
 MKAnnotationViewDragState) {
 
    switch (newState) {
 
    case .Starting:
        view.dragState = .Dragging
    case .Ending, .Canceling:
        view.dragState = .None
    default: break
 
    }
}

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