Platformsios 9.0

This library handles changing locale/language on the fly.

User interface direction will be updated automatically for right-to-left languages.

[![Swift Version][swift-image]][swift-url]
[![Release version][release-image]][release-url]


  • Swift 4.0 or higher
  • iOS 9.0
  • XCode 9.0


First you must clone this project from github:

git clone

Then you can either install manually by adding Sources/LocaleManager directory to your project
or create a xcodeproj file and add it as a dynamic framework:

swift package generate-xcodeproj



First, Add this line to you AppDelegate class:

class AppDelegate: UIResponder, UIApplicationDelegate {

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Your initialization code here

        return true


Prepare storyboard

Set Storyboard ID for your root view controller in Main.storyboard to a non-nil string.

If you don’t use storyboard, set LocaleManager.rootViewController to a closure or method that
returns an instance of root view controller of your application.

Show available localizations to user

Your app should provide localizations’ list to user.
You can fetch list of available localizations according to your project by:

let languages = LocaleManager.availableLocalizations

Now languages variable is a dictionary. If you don’t have any localization,
the dictionary will be ["Base": "Base"], all other localizations will be added after.

You must pass dictionary’s key to LocaleManager‘s methods, while dictionary values are localized name of corresponding key.
E.g. "de" will be "German" for English environment while it will be "Deutsch" in German environment.

When user selected a localization, follow next step.

Change localization on the fly

Nothing special here, just add following line:

let localeID = "fa"
LocaleManager.apply(identifier: localeID)

If you have Locale object instead of identifier:

let locale = Locale(identifier: "fa")
LocaleManager.apply(locale: locale)

This will cause a flip animation while changing language. If you don’t want that:

let localeID = "en"
LocaleManager.apply(identifier: localeID, animated: false)

To remove any custom localization and allow iOS to select a localization according system language:

LocaleManager.apply(locale: nil)

If you used other libraries like maximbilan/ios_language_manager before,
call LocaleManager.apply(locale: nil) for the first time to remove remnants in order to avoid conflicting.

Get active locale

let locale = Locale.userPreferred // e.g "en_US"
print(locale.languageCode)  // e.g "en"

Localizing numbers

Numbers won’t be localized by default, to show localized numbers:

// Int
let n = 10
label.text = (n as NSNumber).localized()

// Double with 2 fraction
let d = 10.12
label.text = (n as NSNumber).localized(precision: 2)

// Percentage
let d = 0.5 // 50%
label.text = (n as NSNumber).localized(style: .percent)

Formatted strings (Swift only)

Using NSLocalizedString() method you can fetch localized string from Localizable.strings file.
In case the returned string is a formattable text, you can fill placeholders easily:

let completed = 10
let total = 15
let completedText = (completed as NSNumber).localized()
let totalText = = (total as NSNumber).localized()
let template = NSLocalizedString("Progress %@ out of %@ items", comment: "")
let formattedText = template.localizedFormat(completedText, totalText)

Mirrored Images

Due to an underlying bug in iOS, if you have an image which should be flipped for RTL languages,
don’t use asset’s direction property to mirror image,
use image.imageFlippedForRightToLeftLayoutDirection() to initialize flippable image instead.

Extra steps

If your app needs extra steps for updating interface (e.g. clearing caches), use LocaleManager.updateHandler property.

Known issues

Check Issues page.


We would love for you to contribute to LocaleManager, check the LICENSE file for more info.

Latest podspec

    "name": "LocaleManager",
    "version": "1.3.0",
    "summary": "Changing iOS locale and language on the fly without exiting. RTL supported.",
    "description": "This library handles changing locale/language on the fly.nUser interface direction will be updated automatically for right-to-left languages.",
    "homepage": "",
    "license": {
        "type": "MIT",
        "file": "LICENSE"
    "authors": {
        "Amir Abbas Mousavian": "[email protected]"
    "social_media_url": "",
    "swift_version": "4.1",
    "platforms": {
        "ios": "9.0"
    "source": {
        "git": "",
        "tag": "1.3.0"
    "source_files": "Sources/**/*.swift",
    "exclude_files": "Sources/Exclude",
    "frameworks": "UIKit"

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