Adding Settings Screen + App Icon Switcher

SwiftLeeds.xcodeproj/project.pbxproj

@@ -120,8 +120,16 @@
 		AEDC22532898281300746247 /* MyConferenceViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = AEDC22522898281300746247 /* MyConferenceViewModel.swift */; };
 		AEDC22552898288F00746247 /* Schedule.swift in Sources */ = {isa = PBXBuildFile; fileRef = AEDC22542898288F00746247 /* Schedule.swift */; };
 		AEDC2257289C65D500746247 /* Calendar.swift in Sources */ = {isa = PBXBuildFile; fileRef = AEDC2256289C65D500746247 /* Calendar.swift */; };
-		E3569AEE2E5A1D0200BC9556 /* ShimmerView.swift in Sources */ = {isa = PBXBuildFile; fileRef = E3569AED2E5A1D0200BC9556 /* ShimmerView.swift */; };
 		E3569AEF2E5A1D0200BC9556 /* ShimmerView.swift in Sources */ = {isa = PBXBuildFile; fileRef = E3569AED2E5A1D0200BC9556 /* ShimmerView.swift */; };
+		E3569AF42E5A2F1D00BC9556 /* SettingsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = E3569AF12E5A2F1D00BC9556 /* SettingsView.swift */; };
+		E3569AF52E5A2F1D00BC9556 /* SettingsViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = E3569AF22E5A2F1D00BC9556 /* SettingsViewModel.swift */; };
+		E3569AF92E5A301D00BC9556 /* ThemeManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = E3569AF82E5A301D00BC9556 /* ThemeManager.swift */; };
+		E3569B002E5A55D000BC9556 /* UserDefaultsKeys.swift in Sources */ = {isa = PBXBuildFile; fileRef = E3569AFF2E5A55D000BC9556 /* UserDefaultsKeys.swift */; };
+		E3569B052E5B902B00BC9556 /* UserDefaultsKeys.swift in Sources */ = {isa = PBXBuildFile; fileRef = E3569AFF2E5A55D000BC9556 /* UserDefaultsKeys.swift */; };
+		E3569B062E5B903800BC9556 /* ShimmerView.swift in Sources */ = {isa = PBXBuildFile; fileRef = E3569AED2E5A1D0200BC9556 /* ShimmerView.swift */; };
+		E3569B072E5B904400BC9556 /* ThemeManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = E3569AF82E5A301D00BC9556 /* ThemeManager.swift */; };
+		E3569B082E5B905100BC9556 /* SettingsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = E3569AF12E5A2F1D00BC9556 /* SettingsView.swift */; };
+		E3569B092E5B905700BC9556 /* SettingsViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = E3569AF22E5A2F1D00BC9556 /* SettingsViewModel.swift */; };
 		FA1F7EF7287CB71600E12F8C /* HeaderView.swift in Sources */ = {isa = PBXBuildFile; fileRef = FA1F7EF6287CB71600E12F8C /* HeaderView.swift */; };
 		FA534D8228A1909300A3BFBB /* Local.swift in Sources */ = {isa = PBXBuildFile; fileRef = FA534D8128A1909300A3BFBB /* Local.swift */; };
 		FA534D8828A1939500A3BFBB /* LocalViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = FA534D8728A1939500A3BFBB /* LocalViewModel.swift */; };
@@ -264,6 +272,10 @@
 		AEDC22542898288F00746247 /* Schedule.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Schedule.swift; sourceTree = "<group>"; };
 		AEDC2256289C65D500746247 /* Calendar.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Calendar.swift; sourceTree = "<group>"; };
 		E3569AED2E5A1D0200BC9556 /* ShimmerView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ShimmerView.swift; sourceTree = "<group>"; };
+		E3569AF12E5A2F1D00BC9556 /* SettingsView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingsView.swift; sourceTree = "<group>"; };
+		E3569AF22E5A2F1D00BC9556 /* SettingsViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingsViewModel.swift; sourceTree = "<group>"; };
+		E3569AF82E5A301D00BC9556 /* ThemeManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ThemeManager.swift; sourceTree = "<group>"; };
+		E3569AFF2E5A55D000BC9556 /* UserDefaultsKeys.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UserDefaultsKeys.swift; sourceTree = "<group>"; };
 		FA1F7EF6287CB71600E12F8C /* HeaderView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HeaderView.swift; sourceTree = "<group>"; };
 		FA534D8128A1909300A3BFBB /* Local.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Local.swift; sourceTree = "<group>"; };
 		FA534D8728A1939500A3BFBB /* LocalViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LocalViewModel.swift; sourceTree = "<group>"; };
@@ -487,6 +499,7 @@
 				AEDC0DAF28675D060078A153 /* My Conference */,
 				0B4B1A492A4858DC00ED7EA9 /* Sponsors */,
 				AEDC0DAC286759570078A153 /* Tab */,
+				E3569AF32E5A2F1D00BC9556 /* Settings */,
 			);
 			path = Views;
 			sourceTree = "<group>";
@@ -498,6 +511,8 @@
 				AECB29832741ABFD00CDC983 /* Info.plist */,
 				AECB295627417F9D00CDC983 /* SwiftLeedsApp.swift */,
 				740162D92A7053A000C2D1B3 /* AppState.swift */,
+				E3569AF82E5A301D00BC9556 /* ThemeManager.swift */,
+				E3569AFF2E5A55D000BC9556 /* UserDefaultsKeys.swift */,
 			);
 			path = App;
 			sourceTree = "<group>";
@@ -546,6 +561,15 @@
 			path = "My Conference";
 			sourceTree = "<group>";
 		};
+		E3569AF32E5A2F1D00BC9556 /* Settings */ = {
+			isa = PBXGroup;
+			children = (
+				E3569AF12E5A2F1D00BC9556 /* SettingsView.swift */,
+				E3569AF22E5A2F1D00BC9556 /* SettingsViewModel.swift */,
+			);
+			path = Settings;
+			sourceTree = "<group>";
+		};
 		FA57DE412875B03800911F03 /* Common */ = {
 			isa = PBXGroup;
 			children = (
@@ -830,6 +854,8 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				E3569AF42E5A2F1D00BC9556 /* SettingsView.swift in Sources */,
+				E3569AF52E5A2F1D00BC9556 /* SettingsViewModel.swift in Sources */,
 				0B4CB3E028EAF58A00246E62 /* Schedule.swift in Sources */,
 				0B4CB3EE28EAF5FB00246E62 /* String.swift in Sources */,
 				0B4CB3DF28EAF58400246E62 /* Constants.swift in Sources */,
@@ -840,6 +866,7 @@
 				0B4CB3ED28EAF5F200246E62 /* SwiftLeedsContainer.swift in Sources */,
 				0B4CB3EC28EAF5E900246E62 /* ActivityView.swift in Sources */,
 				0B4CB3F228EAF61600246E62 /* WebView.swift in Sources */,
+				E3569B052E5B902B00BC9556 /* UserDefaultsKeys.swift in Sources */,
 				AE1CDBF02AC05B2B00E83420 /* HttpMethod.swift in Sources */,
 				0B4B1A512A48FB6400ED7EA9 /* SponsorsViewModel.swift in Sources */,
 				0B4CB3EA28EAF5D900246E62 /* Color.swift in Sources */,
@@ -853,10 +880,10 @@
 				0B4CB3E928EAF5D200246E62 /* Local.swift in Sources */,
 				0B4CB3E228EAF59900246E62 /* Calendar.swift in Sources */,
 				0B910A352A48FEC100648B32 /* SponsorTileView.swift in Sources */,
+				E3569B062E5B903800BC9556 /* ShimmerView.swift in Sources */,
 				AE1CDBED2AC05B2B00E83420 /* Request.swift in Sources */,
 				AE9367972A9354CC00F2DB3F /* Helper.swift in Sources */,
 				0B4CB3E528EAF5B700246E62 /* Speaker.swift in Sources */,
-				E3569AEE2E5A1D0200BC9556 /* ShimmerView.swift in Sources */,
 				0B4CB3E828EAF5CD00246E62 /* AnnouncementCell.swift in Sources */,
 				0B4CB3DD28EAF57900246E62 /* MyConferenceView.swift in Sources */,
 				0B4CB3CA28EAF19100246E62 /* ContentView.swift in Sources */,
@@ -868,6 +895,7 @@
 				0B4CB3F428EAF62100246E62 /* CommonTileView.swift in Sources */,
 				0B4CB3C828EAF19100246E62 /* SwiftLeedsAppClipApp.swift in Sources */,
 				0B4CB3F328EAF61B00246E62 /* CommonTileButton.swift in Sources */,
+				E3569B072E5B904400BC9556 /* ThemeManager.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -901,6 +929,7 @@
 				AED26F7828676A9900E06064 /* AboutView.swift in Sources */,
 				FA57DE502875B09900911F03 /* SponsorTileView.swift in Sources */,
 				394653AB288BB7C800212E1C /* SpeakerView.swift in Sources */,
+				E3569B002E5A55D000BC9556 /* UserDefaultsKeys.swift in Sources */,
 				FA57DE4D2875B08600911F03 /* LinearGradient.swift in Sources */,
 				394653A9288BB47A00212E1C /* SectionHeader.swift in Sources */,
 				FA57DE552875B0C100911F03 /* SquishyButtonStyle.swift in Sources */,
@@ -917,13 +946,16 @@
 				AE8C1B2428BFCFC700AF7318 /* Presentation.swift in Sources */,
 				AE1CDBE92AC058C300E83420 /* URLSession.swift in Sources */,
 				2A3831122884A96600030002 /* FancyHeaderView.swift in Sources */,
+				E3569B082E5B905100BC9556 /* SettingsView.swift in Sources */,
 				FA57DE4B2875B06B00911F03 /* SwiftLeedsContainer.swift in Sources */,
 				74F5EF892A49CECB008D9413 /* SidebarView.swift in Sources */,
 				FAAB819128844EBC001159BB /* View+MeasureSize.swift in Sources */,
+				E3569AF92E5A301D00BC9556 /* ThemeManager.swift in Sources */,
 				AECB298227418DA200CDC983 /* Color.swift in Sources */,
 				AE1CDBE12AC0586500E83420 /* HttpMethod.swift in Sources */,
 				FA534D8828A1939500A3BFBB /* LocalViewModel.swift in Sources */,
 				AE5EFD75289E7CBF00464FE1 /* ActivityView.swift in Sources */,
+				E3569B092E5B905700BC9556 /* SettingsViewModel.swift in Sources */,
 				AED26F7028675DA000E06064 /* AnnouncementCell.swift in Sources */,
 				AEB06BD128CF8D2100E51967 /* WebView.swift in Sources */,
 				AE8C1B2828C4B36B00AF7318 /* AppDelegate+Push.swift in Sources */,
@@ -997,6 +1029,7 @@
 		0B4CB3D628EAF19100246E62 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				ASSETCATALOG_COMPILER_ALTERNATE_APPICON_NAMES = "AppIcon-Space AppIcon-Olympics";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
@@ -1035,6 +1068,7 @@
 		0B4CB3D728EAF19100246E62 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				ASSETCATALOG_COMPILER_ALTERNATE_APPICON_NAMES = "AppIcon-Space AppIcon-Olympics";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
@@ -1252,6 +1286,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
+				ASSETCATALOG_COMPILER_ALTERNATE_APPICON_NAMES = "AppIcon-Space AppIcon-Olympics";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CODE_SIGN_ENTITLEMENTS = SwiftLeeds/SwiftLeeds.entitlements;
@@ -1288,6 +1323,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
+				ASSETCATALOG_COMPILER_ALTERNATE_APPICON_NAMES = "AppIcon-Space AppIcon-Olympics";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CODE_SIGN_ENTITLEMENTS = SwiftLeeds/SwiftLeeds.entitlements;

SwiftLeeds/App/AppState.swift

@@ -7,7 +7,7 @@
 
 import Foundation
 enum TabItems: Int {
-    case conference, location, about, sponsors
+    case conference, location, about, sponsors, settings
 }
 
 final class AppState: ObservableObject {

SwiftLeeds/App/SwiftLeedsApp.swift

@@ -12,11 +12,13 @@ struct SwiftLeedsApp: App {
     @UIApplicationDelegateAdaptor(AppDelegate.self) private var appDelegate
 
     @StateObject private var appState = AppState()
+    @StateObject private var themeManager = ThemeManager.shared
 
     var body: some Scene {
         WindowGroup {
             Tabs()
                 .environmentObject(appState)
+                .environmentObject(themeManager)
                 .onContinueUserActivity(NSUserActivityTypeBrowsingWeb, perform: handleUserActivity)
         }
     }

SwiftLeeds/App/ThemeManager.swift

@@ -0,0 +1,87 @@
+//
+//  ThemeManager.swift
+//  SwiftLeeds
+//
+//  Created by Adam Rush on 23/08/2025.
+//
+
+import SwiftUI
+import UIKit
+
+/// Available theme options for the application
+enum ThemeOption: String, CaseIterable {
+    case system = "system"
+    case light = "light"
+    case dark = "dark"
+
+    /// User-friendly display name for the theme option
+    var displayName: String {
+        switch self {
+        case .system: return "System"
+        case .light: return "Light"
+        case .dark: return "Dark"
+        }
+    }
+
+    /// Corresponding UIUserInterfaceStyle for the theme
+    var userInterfaceStyle: UIUserInterfaceStyle {
+        switch self {
+        case .light: return .light
+        case .dark: return .dark
+        case .system: return .unspecified
+        }
+    }
+}
+
+/// Manages the application's theme settings and appearance
+final class ThemeManager: ObservableObject {
+    /// Shared singleton instance
+    static let shared = ThemeManager()
+
+    /// Currently selected theme, automatically synced with UserDefaults
+    @Published var currentTheme: ThemeOption = .system
+
+    private init() {
+        loadTheme()
+        applyTheme(currentTheme)
+    }
+
+    /// Updates the application theme and persists the selection
+    /// - Parameter theme: The new theme to apply
+    func setTheme(_ theme: ThemeOption) {
+        currentTheme = theme
+        UserDefaults.standard.set(theme.rawValue, forKey: UserDefaultsKeys.selectedTheme)
+        applyTheme(theme)
+    }
+
+    /// Loads the saved theme preference from UserDefaults
+    private func loadTheme() {
+        if let savedTheme = UserDefaults.standard.string(forKey: UserDefaultsKeys.selectedTheme),
+           let theme = ThemeOption(rawValue: savedTheme) {
+            currentTheme = theme
+        }
+    }
+
+    /// Applies the specified theme to the application UI
+    /// - Parameter theme: The theme to apply
+    private func applyTheme(_ theme: ThemeOption) {
+        DispatchQueue.main.async {
+            self.updateUserInterfaceStyle(theme.userInterfaceStyle)
+        }
+    }
+
+    /// Updates the user interface style for all windows in the current scene
+    /// - Parameter style: The UIUserInterfaceStyle to apply
+    private func updateUserInterfaceStyle(_ style: UIUserInterfaceStyle) {
+        guard let windowScene = UIApplication.shared.connectedScenes
+            .compactMap({ $0 as? UIWindowScene })
+            .first else {
+            print("Warning: Unable to find window scene for theme application")
+            return
+        }
+
+        windowScene.windows.forEach { window in
+            window.overrideUserInterfaceStyle = style
+        }
+    }
+}

SwiftLeeds/App/UserDefaultsKeys.swift

@@ -0,0 +1,13 @@
+//
+//  UserDefaultsKeys.swift
+//  SwiftLeeds
+//
+//  Created by Adam Rush on 23/08/2025.
+//
+
+import Foundation
+
+enum UserDefaultsKeys {
+    static let selectedTheme = "selectedTheme"
+    static let selectedAppIcon = "selectedAppIcon"
+}