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.
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 below is in Swift 3)
Will return the Device language:
let locale = NSLocale.current.languageCode
Will return the App language:
let pre = Locale.preferredLanguages[0]
Swift 4 & 5:
Locale.current.languageCode
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.
In Swift 3:
NSLocale.current.languageCode
TL;DR:
Use Bundle.main.preferredLocalizations[0] to get the language your app's UI is currently displayed in. Don't use Locale.current because it describes the region format (time, currency, distance, etc) and has nothing to do with language.
Detailed Answer:
The definite answer about how to get the language(!) code for the language your app's UI is displayed in comes from Apple engineer Quinn "The Eskimo", and I quote/paraphrase for Swift:
Locale.current returns the current locale, that is, the value set by Settings > General > Language & Region > Region Formats. It has nothing to do with the language that your app is running in. It's perfectly reasonable, and in fact quite common, for users in the field to have their locale and language set to 'conflicting' values. For example, a native English speaker living in France would have the language set to English but might choose to set the locale to French (so they get metric weights and measures, 24 time, and so on).
The language that your app runs in is determined by the language setting, that is, Settings > General > Language & Region > Preferred Language Order. When the system runs your app it takes this list of languages (the preferred list) and matches it against the list of languages that your app is localised into (the app list). The first language in the preferred list that exists in the app list is the language chosen for the app. This is what you'll find in the first entry of the main bundle's preferredLocalizations array.
Language Name from Code
To get the human-readable name of a language from its code, you can use this:
let langCode = Bundle.main.preferredLocalizations[0]
let usLocale = Locale(identifier: "en-US")
var langName = ""
if let languageName = usLocale.localizedString(forLanguageCode: langCode) {
langName = languageName
}
This will give you the English name of the current UI language.
To get current language used in your app (different than preferred languages)
NSLocale.currentLocale().objectForKey(NSLocaleLanguageCode)!
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
Locale.current.languageCode returns me wrong code, so I use these extensions:
extension Locale {
static var preferredLanguageCode: String {
guard let preferredLanguage = preferredLanguages.first,
let code = Locale(identifier: preferredLanguage).languageCode else {
return "en"
}
return code
}
static var preferredLanguageCodes: [String] {
return Locale.preferredLanguages.compactMap({Locale(identifier: $0).languageCode})
}
}
Swift 5.4:
let languagePrefix = Locale.preferredLanguages[0]
print(languagePrefix)
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
This is what I use in Swift 5 Xcode 11:
Inside the class variables:
let languagePrefix = Bundle.main.preferredLocalizations.first?.prefix(2)
This comes as a string. It returns 2 characters, i.e. "en", "es", "de"...
From this I can easily determine what language to display:
if languagePrefix == "es" { self.flipCard.setTitle("última carta", for: .normal) }
if languagePrefix == "en" { self.flipCard.setTitle("Last Card", for: .normal) }
If you want the full information of the language, then remove ?.prefex(2)
in most cases you want to get the language code of the current app UI, to send over an API to get localized response
extension Bundle {
var currentLocalizedUILanguageCode: String {
guard let code = Bundle.main.preferredLocalizations.first?.components(separatedBy: "-").first else {
return Locale.current.languageCode ?? "en"
}
return code
}
}
use like
headers["X-Language"] = Bundle.main.currentLocalizedUILanguageCode
use this function for get your system's current language code from iOS devices
func getSystemLanguageCode() -> String {
UserDefaults.standard.removeObject(forKey: "AppleLanguages")
let pref_Language = NSLocale.preferredLanguages[0] as String //"fr-IN"
let language = pref_Language.components(separatedBy: "-") //["fr","IN"]
let lang_Code = language.first?.lowercased() ?? "" //"fr"
UserDefaults.standard.set([lang_Code], forKey: "AppleLanguages")
return lang_Code
}
Almost none of the answers are correct. This is working Swift 5.7 solution.
extension Locale {
// Gets the language of the device, had to remove the content of AppleLanguages since `preferredLanguages`
// is combining the result from multiple APIs. AppleLanguage is then being set to the old value
static var preferredLanguageCode: String {
let appleLanguages = UserDefaults.standard.stringArray(forKey: kLanguage)
UserDefaults.standard.removeObject(forKey: kLanguage)
guard let preferredLanguage = preferredLanguages.first,
let code = Locale(identifier: preferredLanguage).languageCode else {
UserDefaults.standard.set(appleLanguages, forKey: kLanguage)
return "en"
}
UserDefaults.standard.set(appleLanguages, forKey: kLanguage)
return code
}
}
I want to check a string to be able to understand that string is suitable for using as a display name in the app. Below block looks only for english characters. How can I cover all language letters? Also all punctuations and numbers won't be allowed.
func isSuitableForDisplayName(inputString: String) -> Bool {
let mergedString = inputString.stringByRemovingWhitespaces
let characterset = CharacterSet(charactersIn: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
if mergedString.rangeOfCharacter(from: characterset.inverted) != nil {
return false
} else {
return true
}
}
You can use CharacterSet.letters, which contains all the characters in the Unicode categories L and M.
Category M includes combining marks. If you don't want those, use:
CharacterSet.letters.subtracting(.nonBaseCharacters)
Also, your way of checking whether a string contains only the characters in a character set is quite weird. I would do something like this:
return mergedString.trimmingCharacters(in: CharacterSet.letters) == ""
My scenario, I am trying to pass the language code based on it SFSpeechRecognizer changing language for speech to text. Here, I can able to use only apple provided 63 languages. If I pass some other languages I am getting crash because of language unavailability. How to validate and handle it in a proper way using swift?
My Code
private let speechRecognizer = SFSpeechRecognizer(locale: Locale.init(identifier: "en-US")) //1
I followed below tutorial for implementing speech to text
https://www.appcoda.com/siri-speech-framework/
You can check if the Locale is supported by supportedLocales
// Locales which support speech recognition.
// Note that supported does not mean currently available; some locales
// may require an internet connection, for example.
+ (NSSet<NSLocale *> *)supportedLocales;
let locale = Locale(identifier: "hi-IN")
SFSpeechRecognizer.supportedLocales().contains(locale) // Can check using this
let sr = SFSpeechRecognizer(locale: locale)
sr?.isAvailable // Can check using this
lazy var srf: SFSpeechRecognizer? = {
let locale = Locale(identifier: "hi-IN")
return SFSpeechRecognizer.supportedLocales().contains(locale) ? SFSpeechRecognizer(locale: locale) : nil
}()
I work with localization and have a question:
I need this:
if language = english -> use this func, else use this func
I don't really understand how I can clarify this particular language
An option could be for you to have a localised key in both your translations:
Localizable.string (English) current_language = "en"
Localizable.string (Russian) current_language = "ru"
And then
let currentLanguage = NSLocalizedString("current_language", comment: "")
if currentLanguage == "en" {
englishFunction()
} else {
russianFunction()
}
2) 2nd option could be to check Device language:
let deviceLanguage = Locale.current.languageCode
3) 3rd option could be to check User preferred language:
let userPreferredLanguage = Locale.preferredLanguages[0]
To understand the difference between App Language and Device Language think of it as in this example: when your app develeopment language is EN and your device is set with IT (italian) language, and you have no localization for IT then: deviceLanguage = en, userPreferredLanguage = it
Your app development language is the default fallback language that will be used as localization in case you have no support language for the user preferences language, the default/fallback language you can find in your .plist file under this key: CFBundleDevelopmentRegion
I searched over web pages and stack overflow about validation of a Persian(Farsi) language string. Most of them have mentioned Arabic letters. Also, I want to know if my string is fully Persian(not contain).
for example, these strings are Persian:
"چهار راه"
"خیابان."
And These are not:
"خیابان 5"
"چرا copy کردی؟"
Also, just Persian or Arabic digits are allowed. There are exceptions about [.,-!] characters(because keyboards are not supported these characters in Persian)
UPDATE:
I explained a swift version of using regex and predicate in my answer.
Based on this extension found elsewhere:
extension String {
func matches(_ regex: String) -> Bool {
return self.range(of: regex, options: .regularExpression, range: nil, locale: nil) != nil
}
}
and construct your regex containing allowed characters like
let mystra = "چهار راه"
let mystrb = "خیابان."
let mystrc = "خیابان 5"
let mystrd = "چرا copy کردی؟" //and so on
for a in mystra {
if String(a).matches("[\u{600}-\u{6FF}\u{064b}\u{064d}\u{064c}\u{064e}\u{064f}\u{0650}\u{0651}\u{0020}]") { // add unicode for dot, comma, and other needed puctuation marks, for now I added space etc
} else { // not in range
print("oh no--\(a)---zzzz")
break // or return false
}
}
Make sure you construct the Unicode needed using the above model.
Result for other strings
for a in mystrb ... etc
oh no--.---zzzz
oh no--5---zzzz
oh no--c---zzzz
Enjoy
After a period I could find a better way:
extension String {
var isPersian: Bool {
let predicate = NSPredicate(format: "SELF MATCHES %#",
"([-.]*\\s*[-.]*\\p{Arabic}*[-.]*\\s*)*[-.]*")
return predicate.evaluate(with: self)
}
}
and you can use like this:
print("yourString".isPersian) //response: true or false
The main key is using regex and predicate. these links help you to manipulate whatever you want:
https://nshipster.com/nspredicate/
https://nspredicate.xyz/
http://userguide.icu-project.org/strings/regexp
Feel free and ask whatever question about this topic :D
[EDIT] The following regex can be used to accept Latin numerics, as they are mostly accepted in Persian texts
"([-.]*\\s*[-.]*\\p{Arabic}*[0-9]*[-.]*\\s*)*[-.]*"