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    <p>I've come up with what I think is a slightly improved version of rickerbh's accepted answer. The first thing to realize is that user defaults are organized into domains, and the <code>@"AppleLanguages"</code> key comes not from the app's domain, but from some domain higher up the hierarchy of domains. This means it is completely safe to remove it from user defaults:</p> <pre><code>NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; [defaults removeObjectForKey:@"AppleLanguages"]; </code></pre> <p>After calling this code, you'll notice that calling <code>[defaults objectForKey:@"AppleLanguages"]</code> still returns a value. So, rather than deleting <code>@"AppleLanguages"</code> at some point later, which could be problematic depending upon the complexity of your app, you want to do the opposite: <strong>delete <code>@"AppleLanguages"</code> immediately</strong>. Essentially, this resets it back to its default value and captures any changes to it the system has made, if, for instance, the user has changed her preferred language.</p> <p>Here's what I do:</p> <pre><code>NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; [defaults removeObjectForKey:@"AppleLanguages"]; NSMutableArray *appleLanguages = [[defaults objectForKey:@"AppleLanguages"] mutableCopy]; NSString *region = [[NSLocale currentLocale] objectForKey:NSLocaleCountryCode]; NSArray *languages = [appleLanguages filteredArrayUsingPredicateFormat:@"not (self contains '-')"]; for (NSString *language in languages) { NSString *languageAndRegion = [NSString stringWithFormat:@"%@-%@", language, region]; [appleLanguages removeObject:languageAndRegion]; } for (NSString *language in languages) { NSString *languageAndRegion = [NSString stringWithFormat:@"%@-%@", language, region]; NSInteger index = [appleLanguages indexOfObject:language]; [appleLanguages insertObject:languageAndRegion atIndex:index]; } [defaults setObject:appleLanguages forKey:@"AppleLanguages"]; </code></pre> <p>(Note that <code>filteredArrayUsingPredicateFormat:</code> is an extension method I wrote. It's not rocket science to figure out what it does or how it works.)</p> <p>This creates localizations for every language in the list combined with the user's region. E.g., if the original list was <code>es en en-GB</code> and the user's region is AU, we'll get <code>es-AU es en-AU en en-GB</code>. Note that <code>es-AU</code> doesn't exist, but it makes no difference. Since the app finds no associated localizations or resources, it just ignores it.</p>
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