How to Get Current Language Code With Swift

How to get system device language, swift iOS

Try this

UserDefaults.standard.stringArray(forKey: "AppleLanguages")

The output will be like - ["en-US"].

It'll return an array with language codes, first index is the current language set in iPhone's setting (it'll be a single item array if the preferred language order in settings is empty.)

How to get detailed language of device in swift

Start with the currentLocale() and ask questions about it. For example:

let lang = NSLocale.currentLocale().localeIdentifier

Or, at a finer level of granularity:

let langId = NSLocale.currentLocale().objectForKey(NSLocaleLanguageCode) as! String
let countryId = NSLocale.currentLocale().objectForKey(NSLocaleCountryCode) as! String
let language = "\(langId)-\(countryId)" // en-US on my machine

How to get human friendly current local language name in iOS?

You can use localizedString(forLanguageCode:) method on Locale object.

let locale: Locale = .current
locale.localizedString(forLanguageCode: "pl_PL") // "Polish"

along with other useful functions that can help you get localized region or currency names from codes.

locale.localizedString(forRegionCode: "pl") // "Poland"
locale.localizedString(forCurrencyCode: "PLN") // "Polish Zloty"

and to use different locale than the .current you can easily initialize it with one of the available identifiers.

let japanese = Locale(identifier: "ja_JP")
japanese.localizedString(forLanguageCode: "pl_PL") // "ポーランド語"
japanese.localizedString(forRegionCode: "pl") // "ポーランド"
japanese.localizedString(forCurrencyCode: "PLN") // "ポーランド ズウォティ"

Getting current device language in iOS?

The solutions provided will actually return the current region of the device - not the currently selected language. These are often one and the same. However, if I am in North America and I set my language to Japanese, my region will still be English (United States). In order to retrieve the currently selected language, you can do:

NSString * language = [[NSLocale preferredLanguages] firstObject];

This will return a two letter code for the currently selected language. "en" for English, "es" for Spanish, "de" for German, etc. For more examples, please see this Wikipedia entry (in particular, the 639-1 column):

List of ISO 639-1 codes

Then it's a simple matter of converting the two letter codes to the string you would like to display. So if it's "en", display "English".

EDIT

Worth to quote the header information from NSLocale.h:

+ (NSArray *)preferredLanguages NS_AVAILABLE(10_5, 2_0); // note that this list does not indicate what language the app is actually running in; the [NSBundle mainBundle] object determines that at launch and knows that information

People interested in app language take a look at @mindvision's answer

Check language in iOS app

Swift 3
You can take the language code like this

let preferredLanguage = NSLocale.preferredLanguages[0]

And then you need to compare it with code string

if preferredLanguage == "en" {
    print("this is English")
} else if preferredLanguage == "uk" {
    print("this is Ukrainian")
}

You can find codes here

An example to check if French ...

/// Is Device use french language 
/// Consider, "fr-CA", "fr-FR", "fr-CH" et cetera
///
/// - Returns: Bool
static func isFrench() -> Bool {
    return NSLocale.preferredLanguages[0].range(of:"fr") != nil
}

How to get the language code back from a localizedString?

We can bind Picker selection directly to AppStorage and use code as tag to match, so code is simplified to

struct ContentView: View {
    @AppStorage("language") var language: String = "en"

    var body: some View {
        VStack {
            Text("Selected: " + language)
            Picker("", selection: $language) {
                ForEach(Bundle.main.localizations, id: \.self) {
                    Text((Locale.current as NSLocale)
                      .localizedString(forLanguageCode: $0)!).tag($0)  // << here !!
                }
            }
        }
    }
}

and selection separated from presentation.

Tested with Xcode 13.4 / iOS 15.5

Test module on GitHub

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