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‎Samples.xcodeproj/project.pbxproj‎

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@@ -367,6 +367,8 @@
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‎Shared/Samples/Create dynamic basemap gallery/CreateDynamicBasemapGalleryView.Views.swift‎

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// Copyright 2024 Esri
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import ArcGIS
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import SwiftUI
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extension CreateDynamicBasemapGalleryView {
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/// A view for selecting a basemap.
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struct BasemapGallery: View {
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/// The view model for the sample.
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@ObservedObject var model: Model
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var body: some View {
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Form {
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Picker("Style", selection: $model.basemapStyle) {
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ForEach(model.stylesInfo, id: \.style) { styleInfo in
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HStack {
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if let image = styleInfo.thumbnail?.image {
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Image(uiImage: image)
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.resizable()
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.scaledToFit()
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.frame(height: 50)
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}
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Text(styleInfo.styleName)
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}
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.tag(styleInfo.style)
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}
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}
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.pickerStyle(.navigationLink)
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Picker("Language", selection: $model.basemapStyleLanguage) {
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Section("Strategy") {
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ForEach(model.languageStrategies, id: \.self) { strategy in
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Text(strategy.label)
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.tag(BasemapStyleLanguage.strategic(strategy))
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}
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}
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Section("Specific") {
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ForEach(model.languages, id: \.self) { language in
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Text(language.label ?? "Unknown")
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.tag(BasemapStyleLanguage.specific(language))
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}
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}
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}
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Picker("Worldview", selection: $model.worldviewCode) {
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ForEach(model.worldviews, id: \.?.code) { worldview in
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Text(worldview?.displayName ?? "")
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.tag(worldview?.code)
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}
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}
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}
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}
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}
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}
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extension BasemapStyleLanguage: Hashable {
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public func hash(into hasher: inout Hasher) {
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switch self {
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case .strategic(let strategy):
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hasher.combine(strategy)
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case .specific(let language):
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hasher.combine(language)
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@unknown default:
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fatalError("Unknown basemap style language.")
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}
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}
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}
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private extension BasemapStyleLanguage {
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/// A human-readable label for the basemap style language.
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var label: String? {
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switch self {
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case .strategic(let strategy):
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strategy.label
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case .specific(let language):
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language.label
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@unknown default:
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fatalError("Unknown basemap style language.")
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}
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}
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}
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private extension BasemapStyleLanguageStrategy {
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/// A human-readable label for the basemap style language strategy.
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var label: String {
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switch self {
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case .default: "Default"
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case .global: "Global"
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case .local: "Local"
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case .applicationLocale: "System Locale"
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@unknown default:
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fatalError("Unknown basemap style language strategy.")
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}
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}
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}
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private extension Locale.Language {
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/// A human-readable label for the language.
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var label: String? {
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Locale.current.localizedString(forIdentifier: self.maximalIdentifier)
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}
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}

‎Shared/Samples/Create dynamic basemap gallery/CreateDynamicBasemapGalleryView.swift‎

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@@ -16,14 +16,140 @@ import ArcGIS
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import SwiftUI
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struct CreateDynamicBasemapGalleryView: View {
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/// A map with a topographic basemap.
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@State private var map = Map(basemapStyle: .arcGISTopographic)
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/// The view model for the sample.
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@StateObject private var model = Model()
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/// A Boolean value indicating whether the basemap gallery is showing.
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@State private var isShowingBasemapGallery = false
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/// The error shown in the error alert.
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@State private var error: Error?
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var body: some View {
23-
MapView(map: map)
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MapView(map: model.map)
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.toolbar {
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ToolbarItemGroup(placement: .bottomBar) {
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Button("Basemap") {
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isShowingBasemapGallery.toggle()
34+
}
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.popover(isPresented: $isShowingBasemapGallery) {
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NavigationStack {
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BasemapGallery(model: model)
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.navigationTitle("Basemap")
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.navigationBarTitleDisplayMode(.inline)
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.toolbar {
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ToolbarItem(placement: .confirmationAction) {
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Button("Done") { isShowingBasemapGallery = false }
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}
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}
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}
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.presentationDetents([.fraction(0.5)])
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.frame(idealWidth: 320, idealHeight: 380)
48+
}
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}
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}
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.task {
52+
do {
53+
try await model.loadStylesInfo()
54+
} catch {
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self.error = error
56+
}
57+
}
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.errorAlert(presentingError: $error)
59+
}
60+
}
61+
62+
extension CreateDynamicBasemapGalleryView {
63+
/// The view model for the sample.
64+
@MainActor
65+
final class Model: ObservableObject {
66+
/// The map shown in the map view.
67+
let map = Map()
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69+
/// The basemap style of the map's basemap.
70+
@Published var basemapStyle = Basemap.Style.arcGISNavigation {
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didSet {
72+
guard basemapStyle != oldValue else { return }
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basemapStyleLanguage = .strategic(.default)
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worldviewCode = nil
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basemapStyleInfo = stylesInfo.first { $0.style == basemapStyle }
77+
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updateBasemap()
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}
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}
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/// The basemap style language of the map's basemap.
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@Published var basemapStyleLanguage = BasemapStyleLanguage.strategic(.default) {
84+
didSet {
85+
guard basemapStyleLanguage != oldValue else { return }
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updateBasemap()
87+
}
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}
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/// The worldview code of the map's basemap.
91+
@Published var worldviewCode: String? {
92+
didSet {
93+
guard worldviewCode != oldValue else { return }
94+
updateBasemap()
95+
}
96+
}
97+
98+
/// The basemap styles info from the basemap styles service.
99+
@Published private(set) var stylesInfo: [BasemapStyleInfo] = []
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/// The basemap style info for the basemap style.
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@Published private var basemapStyleInfo: BasemapStyleInfo?
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104+
/// The basemap style language strategy options for the basemap style info.
105+
var languageStrategies: [BasemapStyleLanguageStrategy] {
106+
return [.default] + (basemapStyleInfo?.languageStrategies ?? [])
107+
}
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109+
/// The language options for the basemap style info.
110+
var languages: [Locale.Language] {
111+
basemapStyleInfo?.languages ?? []
112+
}
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/// The worldview options for the basemap style info.
115+
var worldviews: [Worldview?] {
116+
return [nil] + (basemapStyleInfo?.worldviews ?? [])
117+
}
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119+
init() {
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map.basemap = Basemap(style: basemapStyle)
121+
map.initialViewpoint = Viewpoint(latitude: 52.3433, longitude: -1.5796, scale: 25e5)
122+
}
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/// Loads the styles info from the basemap styles service.
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func loadStylesInfo() async throws {
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let service = BasemapStylesService()
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try await service.load()
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guard let info = service.info else { return }
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stylesInfo = info.stylesInfo
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basemapStyleInfo = stylesInfo.first { $0.style == basemapStyle }
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// Loads the styles info thumbnails.
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await stylesInfo.compactMap(\.thumbnail).load()
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}
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/// Updates the map's basemap with the `basemapStyle`, `basemapStyleLanguage` and `worldviewCode`.
138+
private func updateBasemap() {
139+
let basemapStyleParameters = BasemapStyleParameters(language: basemapStyleLanguage)
140+
basemapStyleParameters.worldview = if let worldviewCode {
141+
Worldview(code: worldviewCode)
142+
} else {
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nil
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}
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map.basemap = Basemap(style: basemapStyle, parameters: basemapStyleParameters)
147+
}
24148
}
25149
}
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27151
#Preview {
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CreateDynamicBasemapGalleryView()
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NavigationStack {
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CreateDynamicBasemapGalleryView()
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}
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}

‎Shared/Samples/Create dynamic basemap gallery/README.metadata.json‎

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"Worldview"
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],
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"snippets": [
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"CreateDynamicBasemapGalleryView.swift"
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"CreateDynamicBasemapGalleryView.swift",
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"CreateDynamicBasemapGalleryView.Views.swift"
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],
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"title": "Create dynamic basemap gallery"
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}

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