i need the delegate method that about zoom the map

Question

i need to do something when map is zoomed to a scale.  i need to know the mapscale in real-time when the map is being zoomed.

Nicholas-Furness · Accepted Answer

Hi, Assuming you have a reference to the AGSMapView named mapView, then if you're using Runtime 100.x, you can use KVO on the map's mapScale property, like this: override func viewDidLoad() { super.viewDidLoad() mapView.addObserver(self, forKeyPath: "mapScale", options: [.new, .old], context: nil) } override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) { if let mapViewThatChanged = object as? AGSMapView, keyPath == "mapScale" { print("Map scale changed to \(mapViewThatChanged.mapScale)") } }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ or if you're using Swift 4, it might look like this: private var scaleKvoToken:NSKeyValueObservation? override func viewDidLoad() { super.viewDidLoad() scaleKvoToken = mapView.observe(\.mapScale) { mapViewThatChanged, _ in print("Map scale changed to \(mapViewThatChanged.mapScale)") } } ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍