Random crash on app language change from app

Question

Created Apr ’25

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I've developed an app in swift and UIKit. Its multi linguistic app supports English and Arabic. When I change the language from English to Arabic or Arabic to English. After changing language, when I navigate through different screens crash is happening randomly on different screens most of the time when I tap to navigate to a screen. And cash log is:

This time crashed with this error Exception NSException * "Not possible to remove variable:\t945: <unknown var (bug!) with engine as delegate:0x2824edf00>{id: 34210} colIndex:261 from engine <NSISEngine: 0x15c5dd5f0>{ delegate:0x15c594b50\nEngineVars:\n\t 0: objective{id: 31542} rowIndex:0\n\t 1: UIButton:0x15c6255b0.Width{id: 31545} rowIndex:1\n\t 2: 0x281c41450.marker{id: 31548} colIndex:1\n\t 3: UIButton:0x15c6255b0.Height{id: 31547} rowIndex:1073741824\n\t 4: 0x281c412c0.marker{id: 31546} colIndex:1073741825\n\t 5: UIButton:0x15c625a50.Width{id: 31549} rowIndex:11\n\t 6: 0x281c41270.marker{id: 31544} colIndex:2\n\t 7: UIButton:0x15c625a50.Height{id: 31551} rowIndex:1073741825\n\t 8: 0x281c414a0.marker{id: 31550} colIndex:1073741826\n\t 9: UILabel:0x15c625d10.Height{id: 31553} rowIndex:1073741826\n\t 10: 0x281c41590.marker{id: 31552} colIndex:1073741827\n\t 11: UIImageView:0x15c625870.Width{id: 31555} rowIndex:3\n\t 12: 0x281c41360.marker{id: 31554} colIndex:3\n\t 13: UIImageView:0x15c625870.Height{id: 31557} rowIndex:1073741827\n\t 14: 0x281c413b0.marker{id: 31556} colIndex:1073741828"... 0x0000000282fb11a0

For switching language I'm using this code snippet:

    private func restartApp() {
        guard let windowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
              let delegate = windowScene.delegate as? SceneDelegate,
              let window = delegate.window else {
            return
        }

        // Create a new root view controller
        let vc : AppLoadingVC = AppRouter.instantiateViewController(storyboard: .Splash)
        let nc = UINavigationController(rootViewController: vc)
        ApplicationManager.sharedInstance.isUserLoggedIn = false
        DispatchQueue.main.async {
            if UserDefaults.isRTL {
                UIView.appearance().semanticContentAttribute = .forceRightToLeft
                SideMenuController.preferences.basic.forceRightToLeft = true
                Localize.setCurrentLanguage("ar")
            } else {
                UIView.appearance().semanticContentAttribute = .forceLeftToRight
                SideMenuController.preferences.basic.forceRightToLeft = false
                Localize.setCurrentLanguage("en")
            }
            window.rootViewController = nc
            window.makeKeyAndVisible()
        }
    }

Please anybody help me I've been stuck here since lot of days. I tried multiple things but all in vain.

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Answer 1

Claude31 OP

Apr ’25

Why do you create a new root VC ?

You should not.

You simply have to:

use NSLocalizedString everywhere
go to app setting to change the language there

For this, I use openSettings:

    @objc func openSettings() {
        
        guard let settingsUrl = URL(string: UIApplication.openSettingsURLString) else {
            return
        }
        
        if UIApplication.shared.canOpenURL(settingsUrl) {
            UIApplication.shared.open(settingsUrl, completionHandler: nil) 
            
        }
    }

It is called from an alert, could be from any button:

Here is the alert action

okAction = UIAlertAction(title: "any title you want", style: .default, handler:  { (action) -> Void in self.openSettings()} )

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