Geocode offline

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 // 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.  import ArcGIS import SwiftUI  struct GeocodeOfflineView: View {  /// The view model for the sample.  @StateObject private var model = Model()   /// The viewpoint of the map view, initially centered on San Diego, CA, USA.  @State private var viewpoint = Viewpoint(  center: Point(x: -13_042_250, y: 3_857_970, spatialReference: .webMercator),  scale: 2e4  )   /// The text in the search bar.  @State private var searchText = ""   /// The search text that has been submitted.  @State private var submittedSearchText: String?   /// A Boolean value indicating whether the "No results found." alert is showing.  @State private var resultAlertIsShowing = false   /// A pre-populated list of example addresses.  private let exampleAddresses = [  "910 N Harbor Dr, San Diego, CA 92101",  "2920 Zoo Dr, San Diego, CA 92101",  "111 W Harbor Dr, San Diego, CA 92101",  "868 4th Ave, San Diego, CA 92101",  "750 A St, San Diego, CA 92101"  ]   var body: some View {  GeocodeMapView(model: model, viewpoint: $viewpoint)  .searchable(text: $searchText, prompt: "Type in an address")  .autocorrectionDisabled()  .onSubmit(of: .search) {  submittedSearchText = searchText  }  .toolbar {  ToolbarItem(placement: .primaryAction) {  Menu {  ForEach(exampleAddresses, id: \.self) { address in  Button(address) {  searchText = address  submittedSearchText = address  }  }  } label: {  Image(systemName: "chevron.down.circle")  }  }  }  .onChange(of: searchText) {  // Reset the marker when the search text changes.  model.resetGraphics()  }  .task(id: submittedSearchText) {  // Geocode the text when a search is submitted.  if let submittedSearchText {  if let resultExtent = await model.geocodeSearch(address: submittedSearchText) {  // If found, zoom to the extent of the result's location.  viewpoint = Viewpoint(boundingGeometry: resultExtent)  } else {  // If no result was found, inform the user with an alert.  resultAlertIsShowing = true  }  }   submittedSearchText = nil  }  .alert("No results found.", isPresented: $resultAlertIsShowing, actions: {})  } }  private extension GeocodeOfflineView {  /// The map view for the sample.  struct GeocodeMapView: View {  /// The view model for the sample.  @ObservedObject var model: Model   /// The action that ends the current search interaction.  @Environment(\.dismissSearch) private var dismissSearch   /// The current viewpoint of the map view.  @Binding var viewpoint: Viewpoint   /// The point on the map where the user tapped.  @State private var tapLocation: Point?   var body: some View {  MapView(map: model.map, viewpoint: viewpoint, graphicsOverlays: [model.graphicsOverlay])  .onViewpointChanged(kind: .centerAndScale) { viewpoint = $0 }  .callout(placement: $model.calloutPlacement) { _ in  Text(model.calloutText)  .font(.callout)  .padding(8)  }  .onSingleTapGesture { _, mapPoint in  tapLocation = mapPoint  }  .onLongPressAndDragGesture { mapPoint in  model.calloutIsOffset = true  tapLocation = mapPoint  } onEnded: {  // Reset the callout's offset when the gesture ends.  if let tapLocation {  model.calloutIsOffset = false  model.updateCalloutPlacement(to: tapLocation)  }  tapLocation = nil  }  .task(id: tapLocation) {  // Reverse geocode the tap location when it changes.  if let tapLocation {  dismissSearch()  await model.reverseGeocode(mapPoint: tapLocation)  }  }  }  } }  private extension MapView {  /// Sets a closure to perform when the map view recognizes a long press and drag gesture.  /// - Parameters:  /// - action: The closure to perform when the gesture is recognized.  /// - onEnded: The closure to perform when the gesture ends.  /// - Returns: A new `View` object.  func onLongPressAndDragGesture(  perform action: @escaping (Point) -> Void,  onEnded: @escaping () -> Void  ) -> some View {  self  .onLongPressGesture { _, mapPoint in  action(mapPoint)  }  .gesture(  LongPressGesture()  .simultaneously(with: DragGesture())  .onEnded { _ in  onEnded()  }  )  } }