ios - Setting "AppleLanguages" doesn't change app language

Question

I am trying to implement a function that can change app language.
I tried to set it like this:

let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject("de", forKey: "AppleLanguages")

And after app restart language is still 'system default'.
Now I test different languages by setting Scheme > Application Language > language.
But is it possible to user click a button and after restart to see picked language?

Also what is the proper way to do this to avoid changing language on restart?

Answer 1

You have to set the AppleLanguages key with an array, not a string:

UserDefaults.standard.set(["de"], forKey: "AppleLanguages")