Allow changing appearance

JellyfinPlayer/SettingsView.swift

@@ -20,6 +20,7 @@ struct SettingsView: View {
     @Default(.isAutoSelectSubtitles) var isAutoSelectSubtitles
     @Default(.autoSelectSubtitlesLangCode) var autoSelectSubtitlesLangcode
     @Default(.autoSelectAudioLangCode) var autoSelectAudioLangcode
+    @Default(.appAppearance) var appAppearance
     @State private var username: String = ""
 
     func onAppear() {
@@ -61,6 +62,15 @@ struct SettingsView: View {
                                         set: { autoSelectAudioLangcode = $0.isoCode}
                                      )
                     )
+                    Picker(NSLocalizedString("Appearance", comment: ""), selection: $appAppearance) {
+                        ForEach(self.viewModel.appearances, id: \.self) { appearance in
+                            Text(appearance.localizedName).tag(appearance.rawValue)
+                        }
+                    }.onChange(of: appAppearance, perform: { value in
+                        guard let window = UIApplication.shared.windows.first else { return }
+                        guard let appearance = AppAppearance(rawValue: value) else { return }
+                        window.overrideUserInterfaceStyle = appearance.style
+                    })
                 }
 
                 Section {

Shared/Extensions/DefaultsExtension.swift

@@ -16,4 +16,5 @@ extension Defaults.Keys {
     static let isAutoSelectSubtitles = Key<Bool>("isAutoSelectSubtitles", default: false)
     static let autoSelectSubtitlesLangCode = Key<String>("AutoSelectSubtitlesLangCode", default: "Auto")
     static let autoSelectAudioLangCode = Key<String>("AutoSelectAudioLangCode", default: "Auto")
+    static let appAppearance = Key<String>("appAppearance", default: AppAppearance.system.rawValue)
 }

Shared/ViewModels/SettingsViewModel.swift

@@ -8,6 +8,7 @@
  */
 
 import Foundation
+import SwiftUI
 
 struct UserSettings: Decodable {
     var LocalMaxBitrate: Int
@@ -30,10 +31,32 @@ struct TrackLanguage: Hashable {
     static let auto = TrackLanguage(name: "Auto", isoCode: "Auto")
 }
 
+enum AppAppearance: String, CaseIterable {
+    case system
+    case dark
+    case light
+    
+    var localizedName: String {
+        return NSLocalizedString(self.rawValue.capitalized, comment: "")
+    }
+    
+    var style: UIUserInterfaceStyle {
+        switch self {
+        case .system:
+            return .unspecified
+        case .dark:
+            return .dark
+        case .light:
+            return .light
+        }
+    }
+}
+
 final class SettingsViewModel: ObservableObject {
     let currentLocale = Locale.current
     var bitrates: [Bitrates] = []
     var langs = [TrackLanguage]()
+    let appearances = AppAppearance.allCases
 
     init() {
         let url = Bundle.main.url(forResource: "bitrates", withExtension: "json")!