You need to create an IBOutlet from the storyboard to your code Apple Docs
Remove the code you have in your viewDidLoad
that creates a new picker.
Then for the the new IBOutlet you've created, set self
as the delegate, so if your outlet was called picker
your viewDidLoad
should look as follows:
- (void)viewDidLoad
{
[super viewDidLoad];
self.picker.delegate = self;
[self.picker setSelectedCountryCode:@"US" animated:YES];
}