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Definition of [NSLocale preferredLanguages] according to the documentations:
The user’s language preference order as an array of NSString objects, each of which is a canonicalized IETF BCP 47 language identifier.
Definition of [[NSBundle mainBundle] preferredLocalizations]:
An array of NSString objects, each of which identifies the a localization in the receiver’s bundle. The languages are in the preferred order.
I really don’t get what the difference is. Which one should be one using?
I believe language is just language, but locale implies a great deal more (e.g. calendar/date computations, currency, number formatting, etc). The Locales Programming Guide is a short read, a great place to start.
More specifically,
+preferredLocalizations, being a bundle resource, is a component of an app itself, configurable during app design, whereas+preferredLanguages, coming fromNSLocale(btw it’s a class method, not an object method) represents the system-level preferences of the user.Therefore,
+preferredLocalizationsprovides the language the app is actually running in whereas+preferredLanguagesprovides the language the user prefers their apps to run in (even if the apps don’t yet support it).