Change Region Format in the app programmatically

Question

I want to change the language and the region format within in the application. I can do something this to change the language.

int main(int argc, char * argv[])
{
  @autoreleasepool {

    [[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObjects:@"zh_CN", nil] forKey:@"AppleLanguages"];
    [[NSUserDefaults standardUserDefaults] synchronize];

    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
  }
}

Then quit the app using exit(0); once user changed the language.

Change Language in the app programmatically

But how can I change the region format to match the selected language? Is this doable?

Answer 1

Change Language in the app programmatically. Or check it manually.

NSBundle* languageBundle = [NSBundle bundleWithPath:path];
NSString* lan = [languageBundle localizedStringForKey:key value:@"" table:nil];
    
NSLog(@"%@: %@ %@",lan, 
    [NSLocale canonicalLanguageIdentifierFromString:lan], 
    [ [[NSLocale alloc] initWithLocaleIdentifier:lan]
        displayNameForKey:NSLocaleIdentifier value:lan]
);