Latest Contributions by Nicholas-Furness

Sounds like you really want to use multiple Graphics, where each graphic's geometry is a single point rather than a single graphic with a multipoint geometry. However,  you could use GeometryEngine.nearestVertex(), passing in the identified multipoint geometry and the identify map location. This returns a ProximityResult which includes a partIndex and pointIndex. ... View more

Yes. You can get the center of the current viewpoint by calling GeoView::currentViewpoint() and passing in a viewpoint type of CenterAndScale (a GeoView could be a MapView (2D) or a SceneView (3D)). The Viewpoint you get back has a targetGeometry, which in this case will be a Point representing the center of the map/scene view. Since you want lat/lon… The units of x/y coordinates of the center point will depend on the spatial reference of the map/scene view. If you know it's WGS84, you're good. But if you don't know, or you know it's something else (a map using our basemaps will likely be Web Mercator), then you can use GeometryEngine to easily project that point to WGS84 and then get the Lat Lon. Note, lat/lon is y/x, not x/y.     ... View more

Simply updating the builder will not update the graphic's geometry. After you removeAll() on the builders, you need to set the geometry on wayPointMakeGraphic and wayPointLineMakeGraphic from the builders again, as you do in your onMouseClicked method. This should set the geometries on the graphics to valid, but empty geometries. ... View more

Out of interest, what do you want the behavior to be when you hit your limiting criteria? But you should be creating an AGSImageTiledLayer with an AGSTileInfo and a full extent. See AGSImageTiledLayer(CustomImageTiledLayer). Since you're working with an ArcGIS service for the layer, you can just lift that directly from the service. This code works well (you should probably modify the tileCount code - I've put no effort into making it thread safe and am relying on the tileRequestHandler being called on the main queue to force sequential access to tileCount) :     import UIKit import ArcGIS class ViewController: UIViewController { @IBOutlet weak var mapView: AGSMapView! let layerURL = URL(string: "https://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer")! var tileCount = 0 override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. let metadataLayer = AGSArcGISTiledLayer(url: layerURL) metadataLayer.load { [weak self] (error) in guard let self = self else { return } if let error = error { print("Error loading layer: \(error.localizedDescription)") return } if let tileInfo = metadataLayer.tileInfo, let fullExtent = metadataLayer.fullExtent { let customLayer = AGSImageTiledLayer(tileInfo: tileInfo, fullExtent: fullExtent) // This highlights how tiles are not retrieved customLayer.noDataTileBehavior = .blank customLayer.tileRequestHandler = { [weak self, layerURL = self.layerURL] tileKey in guard let self = self else { return } guard self.tileCount < 4 else { // Note, the first tile (global tile at zoom 0) might not be displayed as it // is superceded by tiles at zoom level 1. customLayer.respondWithNoDataTile(for: tileKey) return } self.tileCount += 1 let tileUrl = layerURL .appendingPathComponent("tile") .appendingPathComponent("\(tileKey.level)") .appendingPathComponent("\(tileKey.row)") .appendingPathComponent("\(tileKey.column)") // print("\(self.tileCount) \(tileUrl.path)") // Piggy back on ArcGIS Authentication with AGSRequestOperation let tileOp = AGSRequestOperation(url: tileUrl) tileOp.registerListener(customLayer) { [weak customLayer] (tileData, error) in guard let customLayer = customLayer else { return } guard let tileData = tileData as? Data else { customLayer.respondWithNoDataTile(for: tileKey) return } customLayer.respond(with: tileKey, data: tileData, error: error) } AGSOperationQueue.shared().addOperation(tileOp) } let basemap = AGSBasemap(baseLayer: customLayer) self.mapView.map = AGSMap(basemap: basemap) } } } }     ... View more