How to detect and change ios app language using Swift?

Question

I want to detect which language the user have for the device. Then I want to change the language to a different language the app will load appropriate images, strings, storyboards.

I used the following to detect the language:

let lang: String = NSLocale.preferredLanguages()[0] as String

However this will return "en" for me even my iOS simulator is set to Arabic language.

Based on Objective-C questions, I tried to do the following to change the language to Arabic:

NSUserDefaults.setValue("ar", forKey: "AppleLanguage")

But this issues an error:

Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<NSUserDefaults 0x103daa350> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key AppleLanguage.'

malhobayyeb · Accepted Answer · 2014-11-11 08:26:07Z

2

With the code you made, compiler think you're trying to use KVO, setting the value "ar" to the property "AppleLanguage" of the NSUserDefaults class. Which doesn't exist.

Use setObject:forKey: instead of setValue:forKey:

NSUserDefaults.setObject(["ar"], forKey: "AppleLanguage") // First param is an array.

And I never coded in Swift, but don't you need to get the standard defaults NSUserDefaults.standardUserDefaults() before updating anything in it?

edited Nov 11, 2014 at 8:26

malhobayyeb

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answered Nov 9, 2014 at 8:38

Imotep

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2 Comments

Martin R Over a year ago

setObject is better but setValue would work as well. Your second point solves the problem.

Zvi Over a year ago

Did not work for me. The app did not change to RTL and when rerun the app the language returned by NSLocale.preferredLanguages()[0] is always "en-US"

David Sanford · Accepted Answer · 2016-08-29 14:54:06Z

0

To answer the question about detecting the current language on the device is

NSLocale.currentLocale().objectForKey(NSLocaleLanguageCode)! as! String

answered Aug 29, 2016 at 14:54

David Sanford

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