i need the delegate method that about zoom the map

wangchao1 — Wed, 01 Nov 2017 08:59:36 GMT

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.

Re: i need the delegate method that about zoom the map

Nicholas-Furness — Sun, 12 Dec 2021 07:26:51 GMT

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)")
    }
}
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

topic Re: i need the delegate method that about zoom the map in ArcGIS Runtime SDK for iOS Questions

i need the delegate method that about zoom the map

Re: i need the delegate method that about zoom the map