How to get current language code with Swift?

I want get the language code of the device (en, es...) in my app written with Swift. How can get this?

I'm trying this:

  var preferredLanguages : NSLocale!
  let pre = preferredLanguages.displayNameForKey(NSLocaleIdentifier, value: preferredLanguages)

But this returns nil.

Thanks!

Vadim Motorine

In Swift 3

let langStr = Locale.current.languageCode

It's important to make the difference between the App language and the device locale language (The code bellow is in Swift 3)

Will return the Device language:

let locale = NSLocale.current.languageCode

Will return the App language:

let pre = Locale.preferredLanguages[0]

Benknopf

To get current language used in your app (different than preferred languages)

NSLocale.currentLocale().objectForKey(NSLocaleLanguageCode)!

In Swift 3:

NSLocale.current.languageCode

In Swift 5.1:

Locale.current.languageCode

codeByThey

Swift 3 & 4 & 4.2 & 5

Locale.current.languageCode does not compile regularly. Because you did not implemented localization for your project.

You have two possible solutions

1) String(Locale.preferredLanguages[0].prefix(2)) It returns phone lang properly.

If you want to get the type en-En, you can use Locale.preferredLanguages[0]

2) Select Project(MyApp)->Project (not Target)-> press + button into Localizations, then add language which you want.

Bassant Ashraf

swift 3

let preferredLanguage = Locale.preferredLanguages[0] as String
print (preferredLanguage) //en-US

let arr = preferredLanguage.components(separatedBy: "-")
let deviceLanguage = arr.first
print (deviceLanguage) //en

you may use the below code it works fine with swift 3

var preferredLanguage : String = Bundle.main.preferredLocalizations.first!

I want to track the language chosen by the user in Settings app every time the user launches my app - that is not yet localized (my app is in English only). I adopted this logic:

create an enum to to make it easier to handle the languages in array

enum Language: String {

case none = ""
case en = "English"
case fr = "French"
case it = "Italian"

} // add as many languages you want

create a couple of extension to Locale

extension Locale {

    static var enLocale: Locale {

        return Locale(identifier: "en-EN")
    } // to use in **currentLanguage** to get the localizedString in English

    static var currentLanguage: Language? {

        guard let code = preferredLanguages.first?.components(separatedBy: "-").last else {

            print("could not detect language code")

            return nil
        }

        guard let rawValue = enLocale.localizedString(forLanguageCode: code) else {

            print("could not localize language code")

            return nil
        }

        guard let language = Language(rawValue: rawValue) else {

            print("could not init language from raw value")

            return nil
        }
        print("language: \(code)-\(rawValue)")

        return language
    }
}

When you need, you can simply use the extension

if let currentLanguage = Locale.currentLanguage {
    print(currentLanguage.rawValue)
    // Your code here.
}

In Swift, You can get the locale using.

let locale = Locale.current.identifier

来源：https://stackoverflow.com/questions/24591167/how-to-get-current-language-code-with-swift

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