Show shapefile metadata

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 // Copyright 2025 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 ShowShapefileMetadataView: View {  /// Model which contains the logic for loading and setting the data.  @State private var model = Model()  /// The error that occurred, if any, when trying to load the shapefile or display its metadata.  @State private var error: Error?  /// A Boolean value specifying whether the metadata view should be shown  @State private var showMetadata: Bool = false   var body: some View {  MapViewReader { mapView in  MapView(map: model.map)  .onAppear {  Task {  do {  // Attempt to asynchronously load the  // feature layer from the model.  try await model.loadShapefile()  // If the feature layer has a full extent,  // use it to set the map's viewpoint.  if let fullExtent = model.featureLayer?.fullExtent {  await mapView.setViewpointGeometry(  fullExtent,  padding: 50  )  }  } catch {  self.error = error  }  }  }  .toolbar {  ToolbarItem(placement: .bottomBar) {  Button("Show Shapefile Metadata") {  showMetadata.toggle()  }  .popover(isPresented: $showMetadata) {  metadataPopover  }  }  }  .errorAlert(presentingError: $error)  }  }   @ViewBuilder var metadataPopover: some View {  NavigationStack {  MetadataPanel(model: $model)  .navigationTitle("Shapefile Metadata")  .navigationBarTitleDisplayMode(.inline)  .toolbar {  ToolbarItem(placement: .confirmationAction) {  Button("Done") {  showMetadata = false  }  }  }  }  .presentationDetents([.fraction(0.55)])  .frame(idealWidth: 320, idealHeight: 380)  } }  private extension ShowShapefileMetadataView {  @MainActor  @Observable  class Model {  /// Create a map with a topographic basemap.  @ObservationIgnored var map = Map(basemapStyle: .arcGISTopographic)   /// Declare a FeatureLayer to display the shapefile features on the map.  @ObservationIgnored var featureLayer: FeatureLayer?   /// Holds metadata information about the shapefile, such as name, description, etc.  var shapefileInfo: ShapefileInfo?   /// Holds the thumbnail image associated with the shapefile, if available.  var thumbnailImage: UIImage?   /// Asynchronous function to load the feature layer from the shapefile.  func loadShapefile() async throws {  let featureTable = ShapefileFeatureTable(fileURL: .auroraShapefile)  let layer = FeatureLayer(featureTable: featureTable)   try await layer.featureTable?.load()   map.addOperationalLayer(layer)  featureLayer = layer  shapefileInfo = featureTable.info  thumbnailImage = featureTable.info?.thumbnail  }  }   struct MetadataPanel: View {  /// Binding to the model to reflect changes in the UI.  @Binding var model: ShowShapefileMetadataView.Model   var body: some View {  VStack(alignment: .center, spacing: 16) {  if let info = model.shapefileInfo {  Text(info.credits)  .bold()  Text(info.summary)  .font(.caption)  .multilineTextAlignment(.leading)  }  if let image = model.thumbnailImage {  Image(uiImage: image)  .resizable()  .scaledToFit()  .frame(maxHeight: 150)  }   if let tags = model.shapefileInfo?.tags {  Text("Tags: \(tags.joined(separator: ", "))")  .font(.caption2)  .foregroundColor(.secondary)  }  }  .padding()  .cornerRadius(8)  .padding(.horizontal)  }  } }  private extension URL {  static var auroraShapefile: URL {  Bundle.main.url(  forResource: "TrailBikeNetwork",  withExtension: "shp",  subdirectory: "Aurora_CO_shp"  )!  } }  #Preview {  ShowShapefileMetadataView() }