Change App Language in iOS Without Restarting the App

Change app language using button programmatically

Use localization to change the language of the application without restart.

1. Go to project -> select your project in the document outline -> Add the new language.

2. Add Localized.strings files to your project.

3. Add the strings which are used for localization in Localizable.strings(XXX)

For English "hello" = "Hello World";

For Hindi "hello" = "नमस्ते दुनिया";

Code:

import UIKit

extension String {

    var localized: String {
        let lang = currentLanguage()
        let path = Bundle.main.path(forResource: lang, ofType: "lproj")
        let bundle = Bundle(path: path!)
        return NSLocalizedString(self, tableName: nil, bundle: bundle!, value: "", comment: "")
    }

    //Remove here and add these in utilities class
    func saveLanguage(_ lang: String) {

        UserDefaults.standard.set(lang, forKey: "Locale")
        UserDefaults.standard.synchronize()
    }

    func currentLanguage() -> String {

        return UserDefaults.standard.string(forKey: "Locale") ?? ""
    }
}

enum Language: String {
    case english = "English"
    case hindi = "हिंदी"
}

class ViewController: UIViewController {

    var language = Language.english

    override func viewDidLoad() {
        super.viewDidLoad()

        //Initial Setup
        String().saveLanguage("en")
        languageLabel.text = "hello".localized
        languageButton.setTitle(language.rawValue, for: .normal)
    }

    func updateLanguage() {

        if language == .english {
            String().saveLanguage("hi")
            language = .hindi
        } else {
            String().saveLanguage("en")
            language = .english
        }

        languageLabel.text = "hello".localized
        languageButton.setTitle(language.rawValue, for: .normal)
    }

    @IBOutlet weak var languageLabel: UILabel!
    @IBOutlet weak var languageButton: UIButton!

    @IBAction func changeLanguageButtonTapped(_ sender: UIButton) {

        updateLanguage()
    }
}

Swift : How to change language inside app?

found my answer :

NSUserDefaults.standardUserDefaults().setObject(["language identifier"], forKey: "AppleLanguages") 
NSUserDefaults.standardUserDefaults().synchronize()

unfortunately user must restart the app!
if anyone could find a solution to not restart the application please inform me.

Change iOS app language without rebooting the device

You can't change the language of the device in your application but you can change it just for your application by changing the AppleLanguages property in NSUserDefaults. Please note however I believe this still requires restarting the app itself but doesn't require a device restart.

[[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObjects:@"nl", @"en", nil] forKey:@"AppleLanguages"];

Here's another similar question that also maybe able to help you

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