iOS: Add theme override setting

Gemini-iOS/Preferences.swift

@@ -5,7 +5,7 @@
 //  Created by Shadowfacts on 9/27/20.
 //
 
-import Foundation
+import UIKit
 
 class Preferences: Codable, ObservableObject {
     
@@ -34,6 +34,8 @@ class Preferences: Codable, ObservableObject {
     required init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: CodingKeys.self)
         
+        theme = try container.decode(UIUserInterfaceStyle.self, forKey: .theme)
+        
         useInAppSafari = try container.decode(Bool.self, forKey: .useInAppSafari)
         useReaderMode = try container.decode(Bool.self, forKey: .useReaderMode)
     }
@@ -41,16 +43,25 @@ class Preferences: Codable, ObservableObject {
     func encode(to encoder: Encoder) throws {
         var container = encoder.container(keyedBy: CodingKeys.self)
         
+        try container.encode(theme, forKey: .theme)
+        
         try container.encode(useInAppSafari, forKey: .useInAppSafari)
         try container.encode(useReaderMode, forKey: .useReaderMode)
     }
     
+    @Published var theme = UIUserInterfaceStyle.unspecified
+    
     @Published var useInAppSafari = false
     @Published var useReaderMode = false
     
     enum CodingKeys: String, CodingKey {
+        case theme
+        
         case useInAppSafari
         case useReaderMode
     }
     
 }
+
+
+extension UIUserInterfaceStyle: Codable {}

Gemini-iOS/PreferencesView.swift

@@ -15,6 +15,8 @@ struct PreferencesView: View {
     var body: some View {
         NavigationView {
             List {
+                appearanceSection
+                
                 safariSection
             }
             .navigationBarTitle("Preferences")
@@ -34,6 +36,16 @@ struct PreferencesView: View {
         })
     }
     
+    private var appearanceSection: some View {
+        Section(header: Text("Appearance")) {
+            Picker(selection: $preferences.theme, label: Text("Theme")) {
+                Text("Use System Theme").tag(UIUserInterfaceStyle.unspecified)
+                Text("Always Light").tag(UIUserInterfaceStyle.light)
+                Text("Always Dark").tag(UIUserInterfaceStyle.dark)
+            }
+        }
+    }
+    
     private var safariSection: some View {
         Section(header: Text("Safari")) {
             Toggle("Use In-App Safari", isOn: $preferences.useInAppSafari)

Gemini-iOS/SceneDelegate.swift

@@ -9,12 +9,15 @@ import UIKit
 import SwiftUI
 import BrowserCore
 import SafariServices
+import Combine
 
 class SceneDelegate: UIResponder, UIWindowSceneDelegate {
 
     var window: UIWindow?
 
     var navigationManager: NavigationManager!
+    
+    private var cancellables = [AnyCancellable]()
 
     func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
         // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
@@ -42,11 +45,18 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
         // Use a UIHostingController as window root view controller.
         if let windowScene = scene as? UIWindowScene {
             let window = UIWindow(windowScene: windowScene)
+            window.overrideUserInterfaceStyle = Preferences.shared.theme
             window.rootViewController = UIHostingController(rootView: contentView)
 //            window.rootViewController = BrowserViewController(navigator: navigationManager)
             self.window = window
             window.makeKeyAndVisible()
         }
+        
+        Preferences.shared.$theme
+            .sink { (newStyle) in
+                self.window!.overrideUserInterfaceStyle = newStyle
+            }
+            .store(in: &cancellables)
     }
     
     func scene(_ scene: UIScene, openURLContexts URLContexts: Set<UIOpenURLContext>) {