How can I change locale programmatically with Swift

Question

I am making ios app on XCODE 6.3 by Swift. And my app will have the choose language function like the image below

I already have storyboard for my local language. But i can't find out how to change the localization programmatically off the app by the button.

Anyone know how to do it

Answer 1

Here's a way to change it on the fly with Swift, add an extension function to String:

extension String { func localized(lang:String) ->String {      let path = NSBundle.mainBundle().pathForResource(lang, ofType: "lproj")     let bundle = NSBundle(path: path!)      return NSLocalizedString(self, tableName: nil, bundle: bundle!, value: "", comment: "") }} 

Swift 4:

extension String { func localized(_ lang:String) ->String {      let path = Bundle.main.path(forResource: lang, ofType: "lproj")     let bundle = Bundle(path: path!)      return NSLocalizedString(self, tableName: nil, bundle: bundle!, value: "", comment: "") }} 

then assuming you have the regular Localizable.strings set up with lang_id.lproj ( e.g. en.lproj, de.lproj etc. ) you can use this anywhere you need:

var val = "MY_LOCALIZED_STRING".localized("de") 

Answer 2

This allows to change the language just by updating a UserDefaults key.

This is based on the great answer from @dijipiji. This is a Swift 3 version.

extension String {     var localized: String {         if let _ = UserDefaults.standard.string(forKey: "i18n_language") {} else {             // we set a default, just in case             UserDefaults.standard.set("fr", forKey: "i18n_language")             UserDefaults.standard.synchronize()         }          let lang = UserDefaults.standard.string(forKey: "i18n_language")          let path = Bundle.main.path(forResource: lang, ofType: "lproj")         let bundle = Bundle(path: path!)          return NSLocalizedString(self, tableName: nil, bundle: bundle!, value: "", comment: "")     } } 

Usage

Just add .localized to your string, as such :

"MyString".localized , MyString being a key in the Localizable.strings file.

Changing the language

UserDefaults.standard.set("en", forKey: "i18n_language")