Add in-app language picker to App Settings

2026-01-05 19:51:15 +08:00
parent ce0d7ead88
commit 98410fe093
3 changed files with 95 additions and 30 deletions
@@ -7,16 +7,21 @@ import SwiftUI
 #endif

 public struct AppView: View {
+    private static let supportedLanguages: [(code: String?, name: String)] = [
+        (nil, String(localized: "System Default")),
+        ("en", "English"),
+        ("zh-Hans", "简体中文"),
+    ]
+
    @State private var isLoading = true
+    @State private var selectedLanguage: String?

-    @State private var startAtLogin = false
-    @Environment(\.showMenuBarExtra) private var showMenuBarExtra
-    @Environment(\.menuBarExtraSpeedMode) private var menuBarExtraSpeedMode
-    @State private var menuBarExtraInBackground = false
    #if os(macOS)
-
+        @State private var startAtLogin = false
+        @Environment(\.showMenuBarExtra) private var showMenuBarExtra
+        @Environment(\.menuBarExtraSpeedMode) private var menuBarExtraSpeedMode
+        @State private var menuBarExtraInBackground = false
        @State private var rootHelperRegistrationStatus: SMAppService.Status = .notRegistered
-
    #endif

    @State private var alert: AlertState?
@@ -32,6 +37,15 @@ public struct AppView: View {
                }
            } else {
                FormView {
+                    Picker("Language", selection: $selectedLanguage) {
+                        ForEach(Self.supportedLanguages, id: \.code) { language in
+                            Text(language.name).tag(language.code)
+                        }
+                    }
+                    .onChangeCompat(of: selectedLanguage) { newValue in
+                        updateLanguage(newValue)
+                    }
+
                    #if os(macOS)
                        FormToggle("Start At Login", "Launch the application when the system is logged in. If enabled at the same time as `Show in Menu Bar` and `Keep Menu Bar in Background`, the application interface will not be opened automatically.", $startAtLogin) { newValue in
                            updateLoginItems(newValue)
@@ -145,6 +159,7 @@ public struct AppView: View {
    }

    private func loadSettings() async {
+        selectedLanguage = Self.currentLanguage()
        #if os(macOS)
            startAtLogin = SMAppService.mainApp.status == .enabled
            menuBarExtraInBackground = await SharedPreferences.menuBarExtraInBackground.get()
@@ -155,6 +170,32 @@ public struct AppView: View {
        isLoading = false
    }

+    private static func currentLanguage() -> String? {
+        guard let languages = UserDefaults.standard.array(forKey: "AppleLanguages") as? [String],
+              let first = languages.first
+        else {
+            return nil
+        }
+        for language in supportedLanguages {
+            if let code = language.code, first.hasPrefix(code) {
+                return code
+            }
+        }
+        return nil
+    }
+
+    private func updateLanguage(_ language: String?) {
+        if let language {
+            UserDefaults.standard.set([language], forKey: "AppleLanguages")
+        } else {
+            UserDefaults.standard.removeObject(forKey: "AppleLanguages")
+        }
+        alert = AlertState(
+            title: String(localized: "Restart Required"),
+            message: String(localized: "Language will be changed after restarting the app.")
+        )
+    }
+
    #if os(macOS)

        private func updateLoginItems(_ startAtLogin: Bool) {
@@ -27,11 +27,7 @@ public struct SettingView: View {
            self
        }

-        #if os(macOS)
-            case app
-        #endif
-
-        case core, packetTunnel, onDemandRules, profileOverride, sponsors
+        case app, core, packetTunnel, onDemandRules, profileOverride, sponsors

        #if os(macOS)
            var page: SettingsPage {
@@ -58,10 +54,8 @@ public struct SettingView: View {

        var title: String {
            switch self {
-            #if os(macOS)
-                case .app:
-                    return String(localized: "App")
-            #endif
+            case .app:
+                return String(localized: "App")
            case .core:
                return String(localized: "Core")
            case .packetTunnel:
@@ -77,10 +71,8 @@ public struct SettingView: View {

        private var iconImage: String {
            switch self {
-            #if os(macOS)
-                case .app:
-                    return "app.badge.fill"
-            #endif
+            case .app:
+                return "app.badge.fill"
            case .core:
                return "shippingbox.fill"
            case .packetTunnel:
@@ -98,10 +90,8 @@ public struct SettingView: View {
        var contentView: some View {
            Group {
                switch self {
-                #if os(macOS)
-                    case .app:
-                        AppView()
-                #endif
+                case .app:
+                    AppView()
                case .core:
                    CoreView()
                case .packetTunnel:
@@ -165,10 +155,7 @@ public struct SettingView: View {
    public var body: some View {
        FormView {
            Section {
-                #if os(macOS)
-                    Tabs.app.navigationLink
-                #endif
-                ForEach([Tabs.core, Tabs.packetTunnel, Tabs.onDemandRules, Tabs.profileOverride]) { it in
+                ForEach([Tabs.app, Tabs.core, Tabs.packetTunnel, Tabs.onDemandRules, Tabs.profileOverride]) { it in
                    it.navigationLink
                }
            }