ios: remove passcodes if app was reinstalled (#3841)

* ios: remove passwords if app was reinstalled

* change instead of delete

* Revert "change instead of delete"

This reverts commit 1195ee5b30.

* update name and comments

---------

Co-authored-by: Avently <avently@local>
Co-authored-by: Evgeny Poberezkin <evgeny@poberezkin.com>

apps/ios/Shared/AppDelegate.swift

@@ -16,6 +16,7 @@ class AppDelegate: NSObject, UIApplicationDelegate {
         application.registerForRemoteNotifications()
         if #available(iOS 17.0, *) { trackKeyboard() }
         NotificationCenter.default.addObserver(self, selector: #selector(pasteboardChanged), name: UIPasteboard.changedNotification, object: nil)
+        removePasscodesIfReinstalled()
         return true
     }
 
@@ -127,6 +128,19 @@ class AppDelegate: NSObject, UIApplicationDelegate {
         BGManager.shared.receiveMessages(complete)
     }
 
+    private func removePasscodesIfReinstalled() {
+        // Check for the database existence, because app and self destruct passcodes
+        // will be saved and restored by iOS when a user deletes and re-installs the app.
+        // In this case the database and settings will be deleted, but the passcodes won't be.
+        // Deleting passcodes ensures that the user will not get stuck on "Opening app..." screen.
+        if (kcAppPassword.get() != nil || kcSelfDestructPassword.get() != nil) &&
+           !UserDefaults.standard.bool(forKey: DEFAULT_PERFORM_LA) && !hasDatabase() {
+            _ = kcAppPassword.remove()
+            _ = kcSelfDestructPassword.remove()
+            _ = kcDatabasePassword.remove()
+        }
+    }
+
     static func keepScreenOn(_ on: Bool) {
         UIApplication.shared.isIdleTimerDisabled = on
     }