Latest Contributions by SteveEllis1

I'm using the ArcGIS 100.6 iOS SDK and am populating the map with markers on a Graphics Overlay Layer whose locations are stored in a database common to all users of my application. Each marker is stored in a unique record and each record contains the Latitude & Longitude of the marker. When the App is launched it reads the location of all markers in the database and adds each one to the Graphics Overlay as shown below:    let areaMarker = AGSPictureMarkerSymbol(image: UIImage(named: "CustomMarker")!)    let areaMarkerLocation = AGSPointMakeWGS84(y ?? 0.0, x ?? 0.0)    let markerKey = AGSGraphic(geometry: areaMarkerLocation, symbol: areaMarker, attributes: ["marker": markerKey])    self.overlay.graphics.add(markerKey) As shown above, each marker is assigned an attribute "marker:markerKey" that is the unique database record number (key) where the marker location information is stored and serves as the marker ID. Once the initial markers are added to the Overlay, the App "Listens" to the database for the following events: A new marker is added An existing marker is moved to a new location An existing marker is deleted When a marker is moved or deleted the database listener is notified and passed the record number (key) of the marker that was moved (or deleted). If the marker was moved, the record will then contain the new Latitude & Longitude information. I have experimented with reading the graphics overlay and determined that it is a Collection contained in a NSMutable Array. I can read all attributes as follows:    let graphicsCollection = self.overlay.graphics.mutableArrayValue(forKey: "attributes")    print(graphicsCollection) The result is:    (       {          marker = "-KlRW2_rba1zBrDPpxSl";       },       {          marker = "-Lu915xF3zQp4dIYnsP_";       }    ) I can do the same for "geometry" and get the array of AGSPoints:    let graphicsCollection = self.overlay.graphics.mutableArrayValue(forKey: "geometry")    print(graphicsCollection) The result is:    (       "AGSPoint: (-117.826127, 44.781139), sr: 4326",       "AGSPoint: (-112.056906, 33.629829), sr: 4326"    ) I have been unable to determine how to get the "index" of the attribute array (e.g. marker "-KlRW2_rba1zBrDPpxSl" above should have an index of [0]) so I can then use that "index" to access the appropriate AGSPoint and update the Latitude & Longitude or remove the marker. Thanks in advance for the help. ... View more

I am using the ArcGIS 100.6 iOS SDK and am trying to determine the current center of the map view in lat/long coordinates and the view area.  I also want to invoke a listener to detect when a user pans of zooms the map to get the new center and view area.  I am need this information to create and update queries to Firebase/GeoFire so that I can place the appropriate markers on the map based on the viewable area.  As the user zooms out more markers should become visible. Google maps has a simple way to do this:  center = map.getCenter. I cannot find a simple answer to this in the SDK documentation. I have tried setting  currentCenter = mapView.center, but the result is in screen coordinates and there is no concise documentation as to how to convert this point to lat/long. Thanks, Steve ... View more