Debug

Signal/src/AppDelegate.m

@@ -254,6 +254,9 @@ static NSTimeInterval launchStartedAt;
     mainWindow.rootViewController = [LoadingViewController new];
     [mainWindow makeKeyAndVisible];
 
+    LKAppMode appMode = [NSUserDefaults.standardUserDefaults integerForKey:@"appMode"];
+    [self setCurrentAppMode:appMode];
+
     if (@available(iOS 11, *)) {
         // This must happen in appDidFinishLaunching or earlier to ensure we don't
         // miss notifications.
@@ -308,6 +311,9 @@ static NSTimeInterval launchStartedAt;
 
     [self ensureRootViewController];
 
+    LKAppMode appMode = [NSUserDefaults.standardUserDefaults integerForKey:@"appMode"];
+    [self setCurrentAppMode:appMode];
+
     [AppReadiness runNowOrWhenAppDidBecomeReady:^{
         [self handleActivation];
     }];
@@ -937,21 +943,24 @@ static NSTimeInterval launchStartedAt;
 
 # pragma mark - App Mode
 
-- (LKAppMode)getCurrentAppMode {
+- (LKAppMode)getCurrentAppMode
+{
     UIWindow *window = UIApplication.sharedApplication.keyWindow;
     if (window == nil) { return LKAppModeLight; }
     UIUserInterfaceStyle userInterfaceStyle = window.traitCollection.userInterfaceStyle;
-    BOOL isLightMode = userInterfaceStyle == UIUserInterfaceStyleUnspecified || userInterfaceStyle == UIUserInterfaceStyleLight;
+    BOOL isLightMode = userInterfaceStyle == UIUserInterfaceStyleLight || userInterfaceStyle == UIUserInterfaceStyleUnspecified;
     return isLightMode ? LKAppModeLight : LKAppModeDark;
 }
 
-- (void)setCurrentAppModeTo:(LKAppMode)appMode {
+- (void)setCurrentAppMode:(LKAppMode)appMode
+{
     UIWindow *window = UIApplication.sharedApplication.keyWindow;
     if (window == nil) { return; }
+    [NSUserDefaults.standardUserDefaults setInteger:appMode forKey:@"appMode"];
     switch (appMode) {
         case LKAppModeLight: {
             if (@available(iOS 13.0, *)) {
-                window.overrideUserInterfaceStyle = UIUserInterfaceStyleUnspecified;
+                window.overrideUserInterfaceStyle = UIUserInterfaceStyleLight;
             }
             break;
         }
@@ -962,6 +971,7 @@ static NSTimeInterval launchStartedAt;
             break;
         }
     }
+    [NSNotificationCenter.defaultCenter postNotificationName:NSNotification.appModeChanged object:nil];
 }
 
 # pragma mark - Other

Signal/src/Loki/View Controllers/SettingsVC.swift

@@ -327,7 +327,6 @@ final class SettingsVC : BaseVC, AvatarViewHelperDelegate {
     @objc private func switchAppMode() {
         let newAppMode: AppMode = isLightMode ? .dark : .light
         AppModeManager.shared.setCurrentAppMode(to: newAppMode)
-        NotificationCenter.default.post(name: .appModeChanged, object: nil)
     }
 
     @objc private func showQRCode() {

SignalMessaging/Loki/Redesign/Style Guide/AppMode.swift

@@ -30,6 +30,7 @@ public final class AppModeManager : NSObject {
 public protocol AppModeManagerDelegate {
 
     func getCurrentAppMode() -> AppMode
+    @objc(setCurrentAppMode:)
     func setCurrentAppMode(to appMode: AppMode)
 }
 

SignalServiceKit/src/Loki/Utilities/LKUserDefaults.swift

@@ -20,6 +20,10 @@ public enum LKUserDefaults {
     public enum Double : Swift.String {
         case lastDeviceTokenUpload = "lastDeviceTokenUploadTime"
     }
+
+    public enum Int: Swift.String {
+        case appMode
+    }
     
     public enum String {
         case slaveDeviceName(Swift.String)
@@ -53,6 +57,11 @@ public extension UserDefaults {
         get { return self.double(forKey: double.rawValue) }
         set { set(newValue, forKey: double.rawValue) }
     }
+
+    public subscript(int: LKUserDefaults.Int) -> Int {
+        get { return self.integer(forKey: int.rawValue) }
+        set { set(newValue, forKey: int.rawValue) }
+    }
     
     public subscript(string: LKUserDefaults.String) -> String? {
         get { return self.string(forKey: string.key) }