topic Re: mapViewProxy.identifyGraphicsOverlays returns only one object per layer in Swift Maps SDK Questions

mapViewProxy.identifyGraphicsOverlays returns only one object per layer

zdtorok — Thu, 10 Oct 2024 09:35:24 GMT

I have added multiple objects to the same coordinate and layer. I have four layers and tried adding multiple objects for each layers but when I tap on the object it returns an array only with 4 elements - one per layer.

I also set maximumResultsPerOverlay to both a high number and to nil as well - neither of these worked.

The code I refer to:

ArcGIS.MapViewReader { proxy in ArcGIS.MapView(map: model.map, viewpoint: model.viewpoint, graphicsOverlays: model.graphicsOverlays) .onSingleTapGesture { screenPoint, mapPoint in onSingleTapGesture(screenPoint: screenPoint, mapPoint: mapPoint, proxy: proxy) } ... } } private func onSingleTapGesture(screenPoint: CGPoint, mapPoint: ArcGIS.Point, proxy: ArcGIS.MapViewProxy) { Task { guard !model.geometryEditor.isStarted, let identifiedGraphicsOverlays = try? await proxy.identifyGraphicsOverlays(screenPoint: screenPoint, tolerance: 100, maximumResultsPerOverlay: 😎 else { return } // Here identifiedGraphicsOverlays.count = 4 ... } }

I'm using v200.5.1.

Is it a known issue?

Thanks.

Re: mapViewProxy.identifyGraphicsOverlays returns only one object per layer

Ting — Thu, 10 Oct 2024 20:09:54 GMT

Just want to clarify, are you trying to identify on layers or graphics overlays?

The former uses this API: identifyLayers(screenPoint:tolerance:returnPopupsOnly:maximumResultsPerLayer:), whereas the latter uses this: identifyGraphicsOverlays(screenPoint:tolerance:returnPopupsOnly:maximumResultsPerOverlay:)

Re: mapViewProxy.identifyGraphicsOverlays returns only one object per layer

zdtorok — Thu, 10 Oct 2024 20:39:02 GMT

I am identifying graphics overlays, and use identifyGraphicsOverlays(screenPoint:tolerance:returnPopupsOnly:maximumResultsPerOverlay:)

Re: mapViewProxy.identifyGraphicsOverlays returns only one object per layer

Ting — Thu, 10 Oct 2024 20:55:32 GMT

I see. The problem is that each "result" (IdentifyGraphicsOverlayResult type) contains the identified geo-elements for a single graphics overlay. You can access the identified geo-elements, or in this case, the graphics, in each result object, with identifyResult.graphics.

See the following code snippet as an example

struct ContentView: View { @State private var map = Map(basemapStyle: .arcGISLightGray) @State private var graphicsOverlays: [GraphicsOverlay] = { let g1 = Graphic(geometry: Point(latitude: 34.05, longitude: -117), symbol: SimpleMarkerSymbol(color: .red)) let g2 = Graphic(geometry: Point(latitude: 33.95, longitude: -117), symbol: SimpleMarkerSymbol(color: .blue)) let g3 = Graphic(geometry: Point(latitude: 34, longitude: -117.05), symbol: SimpleMarkerSymbol(color: .yellow)) let g4 = Graphic(geometry: Point(latitude: 34, longitude: -116.95), symbol: SimpleMarkerSymbol(color: .green)) let overlay1 = GraphicsOverlay(graphics: [g1, g2]) let overlay2 = GraphicsOverlay(graphics: [g3, g4]) return [overlay1, overlay2] }() @State private var screenPoint: CGPoint? var body: some View { MapViewReader { proxy in MapView(map: map, graphicsOverlays: graphicsOverlays) .onSingleTapGesture { screenPoint, _ in self.screenPoint = screenPoint } .task(id: screenPoint) { guard let screenPoint, let identifyResult = try? await proxy.identifyGraphicsOverlays( screenPoint: screenPoint, tolerance: 10, maximumResultsPerOverlay: nil // nil means unlimited result count ) else { return } print(identifyResult.count) // 2 because we have 2 overlays print(identifyResult.flatMap(\.graphics).count) // 4 because we have 4 graphics } } } }