here iOS SDK creating draggable marker : I want to create draggable marker but it doesn't work. What I have missing?



'''

    let marker = NMAMapMarker(geoCoordinates: coordinates, image: markerImage!)
                
    marker.isDraggable = true            
    mapView.add(mapObject: maker)
    mapView.respond(to: .markerDragBegan) { (drag, map, marker) -> Bool in
                    
       return true
    }

'''