ios - how can i detect when a user adds a keyboard language in settings -

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When I add a new keyboard language to the user in general settings and my application is in the background, I want to receive notification .

Can someone suggest what code is needed to get it, or what preference should I look for?

I have tried: - 

  [[NSNotificationCenter defaultCenter] addObserver: Self selector: @sillector (changed by default) Name: NSUserDefaultsDidChangeNotification object: zero];


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