Swift : How to change language inside app?

Question

i am using Localize-Swift library (Link) to localize my application and it works fine with .strings files. the problem is that i have to localize to a language

Answer 1

found my answer :

NSUserDefaults.standardUserDefaults().setObject(["language identifier"], forKey: "AppleLanguages") 
NSUserDefaults.standardUserDefaults().synchronize()

unfortunately user must restart the app! if anyone could find a solution to not restart the application please inform me.