Change App Localization Based on User Selection - ios

Question

I've read lots of answers about this, but most are many years old and I don't know what's the latest info.
On first launch, my app will ask the user which language (s)he prefers, rather than just using the OS default language.
How can I set the localization rest of the app to the selected language?
How can I get which language the user has selected in other views?
I thought the following code would set the language, but it didn't do the job:
UserDefaults.standard.set("AR", forKey: "AppleLanguages")
UserDefaults.standard.synchronize()

Answer 1

I have handled this with a LanguageManager singleton class, which handles all the localization. Here is some psuedo code, as its typically a fairly large class.
It has a list of all locales that are supported, for example:
let supportedLocales = ['en-US', 'en-CA', 'fr', 'es-ES', 'es-MX']
It also stores the selected language in UserDefaults. When the selectedLocale changes, it sends a Notification, in case you want to notify your views or anything else:
var selectedLocale: String? {
get {
return UserDefaults.standard.object(forKey: UserDefaultsKeys.selectedLocale) as? String
}
set (newLocale) {
let didChange = self.selectedLocale != newLocale
UserDefaults.standard.set(newLocale, forKey: UserDefaultsKeys.selectedLocale)
UserDefaults.standard.synchronize()
if didChange {
NotificationCenter.default.post(name: Notification.Name.localeDidChange, object: nil)
}
}
}
Now, in order to pull strings out of your localized.strings files, you can't use the standard Apple methods - you have to provide your own. Use LanguageManager.shared.getString(for key:String, alt:String) to reference keys in your .strings file to pull out localized strings.
var selectedLanguage:String? {
//returns just the language portion of the locale - eg: 'en' from 'en-US'
if let selectedLocale = selectedLocale {
return selectedLocale.components(separatedBy: "-")[0]
}
return nil
}
func getString(for key:String, alt:String) -> String
{
var val:String? = getString(for:key, language: selectedLocale)
if val == nil {
val = getString(for:key, language: selectedLanguage)
}
if val == nil {
val = getString(for:key, language: "en") //default to English
}
if let val = val {
return val
}
return alternate //use fallback
}
func getString(for key:String, language:String) -> String?
{
let path = Bundle.main.path(forResource:language, ofType:"lproj")
if let languageBundle = Bundle(path:path) {
return languageBundle.localizedString(for: key)
}
return nil
}

Answer 2

By default is the English Language // You can set Language according you
UserDefaults.standard.set("en", forKey: "Apple")
UserDefaults.standard.synchronize()
If you want to current system language than use code
let langStr = Locale.current.languageCode //and set in UserDeafaults
UserDefaults.standard.set(langStr, forKey: "Apple")
var currentlanguage: String?
self.currentlanguage = UserDefaults.standard.object(forKey: "Apple") as! String?
print("current language ---%#",self.currentlanguage)