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141 changes: 141 additions & 0 deletions
141
Shared/Samples/Identify layer features/IdentifyLayerFeaturesView.swift
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| // Copyright 2023 Esri | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // https://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
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| import ArcGIS | ||
| import SwiftUI | ||
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| struct IdentifyLayerFeaturesView: View { | ||
| /// A map with a topographic basemap centered on the United States. | ||
| @State var map: Map = { | ||
| let map = Map(basemapStyle: .arcGISTopographic) | ||
| map.initialViewpoint = Viewpoint( | ||
| center: Point(x: -10977012.785807, y: 4514257.550369, spatialReference: .webMercator), | ||
| scale: 68015210 | ||
| ) | ||
| return map | ||
| }() | ||
|
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| /// The tapped screen point. | ||
| @State var tapScreenPoint: CGPoint? | ||
|
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| /// The string text for the identify layer results overlay. | ||
| @State var overlayText = "Tap on the map to identify feature layers." | ||
|
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| /// A Boolean value indicating whether to show an error alert. | ||
| @State var isShowingAlert = false | ||
|
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| /// The error shown in the error alert. | ||
| @State var error: Error? { | ||
| didSet { isShowingAlert = error != nil } | ||
| } | ||
|
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| var body: some View { | ||
| ZStack { | ||
| MapViewReader { proxy in | ||
| MapView(map: map) | ||
| .onSingleTapGesture { screenPoint, _ in | ||
| tapScreenPoint = screenPoint | ||
| } | ||
| .task { | ||
| do { | ||
| // Add map image layer to the map. | ||
| let mapImageLayer = ArcGISMapImageLayer(url: .worldCities) | ||
| try await mapImageLayer.load() | ||
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| // Hide continent and world layers. | ||
| mapImageLayer.subLayerContents[1].isVisible = false | ||
| mapImageLayer.subLayerContents[2].isVisible = false | ||
| map.addOperationalLayer(mapImageLayer) | ||
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| // Add feature layer to the map. | ||
| let featureTable = ServiceFeatureTable(url: .damageAssessment) | ||
| try await featureTable.load() | ||
| let featureLayer = FeatureLayer(featureTable: featureTable) | ||
| map.addOperationalLayer(featureLayer) | ||
| } catch { | ||
| // Present error load the layers if any. | ||
| self.error = error | ||
| } | ||
| } | ||
| .task(id: tapScreenPoint) { | ||
| // Identify layers using the screen point. | ||
| if let screenPoint = tapScreenPoint, | ||
| let results = try? await proxy.identifyLayers( | ||
| screenPoint: screenPoint, | ||
| tolerance: 12, | ||
| returnPopupsOnly: false, | ||
| maximumResultsPerLayer: 10 | ||
| ) { | ||
| handleIdentifyResults(results) | ||
| } | ||
| } | ||
| .overlay(alignment: .top) { | ||
| Text(overlayText) | ||
| .frame(maxWidth: .infinity, alignment: .center) | ||
| .padding(8) | ||
| .background(.thinMaterial, ignoresSafeAreaEdges: .horizontal) | ||
| } | ||
| .alert(isPresented: $isShowingAlert, presentingError: error) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| private extension IdentifyLayerFeaturesView { | ||
| /// Updates the overlay text based on the identify layer results. | ||
| /// - Parameter results: An `IdentifyLayerResult` array to handle. | ||
| func handleIdentifyResults(_ results: [IdentifyLayerResult]) { | ||
| // Get layer names and geoelement counts from the results. | ||
| let identifyLayerResultInfo: [(layerName: String, geoElementsCount: Int)] = results.map { identifyLayerResult in | ||
| let layerName = identifyLayerResult.layerContent.name | ||
| let geoElementsCount = geoElementsCountFromResult(identifyLayerResult) | ||
| return (layerName, geoElementsCount) | ||
| } | ||
|
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| let message = identifyLayerResultInfo | ||
| .map { "\($0.layerName): \($0.geoElementsCount)" } | ||
| .joined(separator: "\n") | ||
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| let totalGeoElementsCount = identifyLayerResultInfo.map(\.geoElementsCount).reduce(0, +) | ||
|
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| // Update overlay text with the geo-elements found if any. | ||
| overlayText = totalGeoElementsCount > 0 ? message : "No element found." | ||
| } | ||
|
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| /// Counts the geo-elements from an identify layer result using recursion. | ||
| /// - Parameter result: The `IdentifyLayerResult` to count. | ||
| /// - Returns: The count of the geo-elements. | ||
| private func geoElementsCountFromResult(_ identifyResult: IdentifyLayerResult) -> Int { | ||
| // Get geoElements count from the result. | ||
| var count = identifyResult.geoElements.count | ||
|
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| // Get the count using recursion from the result's sublayer results if any. | ||
| for result in identifyResult.sublayerResults { | ||
| count += geoElementsCountFromResult(result) | ||
| } | ||
| return count | ||
| } | ||
| } | ||
|
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| private extension URL { | ||
| /// A world cities image layer URL. | ||
| static var worldCities: URL { | ||
| URL(string: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/SampleWorldCities/MapServer")! | ||
| } | ||
|
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| /// A damage assessment feature layer URL. | ||
| static var damageAssessment: URL { | ||
| URL(string: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/DamageAssessment/FeatureServer/0")! | ||
| } | ||
| } | ||
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| # Identify layer features | ||
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| Identify features in all layers in a map. | ||
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|  | ||
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| ## Use case | ||
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| "Identify layers" operation allows users to tap on a map, returning features at that location across multiple layers. Because some layer types have sublayers, the sample recursively counts results for sublayers within each layer. | ||
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| ## How to use the sample | ||
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| Tap to identify features. The text overlay will update to show all layers with features under the tapped location, as well as a layer count. | ||
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| ## How it works | ||
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| 1. The tapped position is passed to `MapViewProxy.identifyLayers(screenPoint:tolerance:returnPopupsOnly:maximumResultsPerLayer:)` method. | ||
| 2. For each `IdentifyLayerResult` in the results, features are counted. | ||
| * Note: there is one identify result per layer with matching features; if the feature count is 0, that means a sublayer contains the matching features. | ||
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| ## Relevant API | ||
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| * IdentifyLayerResult | ||
| * LayerContent | ||
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| ## Additional information | ||
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| The GeoView supports two methods of identify: `identifyLayer`, which identifies features within a specific layer and `identifyLayers`, which identifies features for all layers in the current view. | ||
|
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| ## Tags | ||
|
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| identify, recursion, recursive, sublayers |
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Shared/Samples/Identify layer features/README.metadata.json
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| { | ||
| "category": "Maps", | ||
| "description": "Identify features in all layers in a map.", | ||
| "ignore": false, | ||
| "images": [ | ||
| "identify-layer-features.png" | ||
| ], | ||
| "keywords": [ | ||
| "identify", | ||
| "recursion", | ||
| "recursive", | ||
| "sublayers", | ||
| "IdentifyLayerResult", | ||
| "LayerContent" | ||
| ], | ||
| "redirect_from": [], | ||
| "relevant_apis": [ | ||
| "IdentifyLayerResult", | ||
| "LayerContent" | ||
| ], | ||
| "snippets": [ | ||
| "IdentifyLayerFeaturesView.swift" | ||
| ], | ||
| "title": "Identify layer features" | ||
| } |
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