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When I try to filter the Contacts properties with displayedPropertyKeys, there is something wrong with the key CNContactBirthdayKey. Even though my contact has a birthday date set, I cant see it in any ContactsUI's ViewController. In the other hand, the properties related to the phone number, or email address seem to work well. I tested it on IOS 12.1 .Can you help me ?Here is the code in Swift 4 :import UIKit import ContactsUI class MyViewController: UIViewController, CNContactPickerDelegate { override func viewDidLoad() { super.viewDidLoad() let contacts = fetchContactsWithBirthday() let vc = CNContactPickerViewController() vc.delegate = self vc.displayedPropertyKeys = [CNContactNonGregorianBirthdayKey, CNContactBirthdayKey, CNContactDatesKey] vc.predicateForEnablingContact = NSPredicate(format: "birthday.@count > 0") self.present(vc, animated: true, completion: nil) let vc2 = CNContactViewController(for: contacts.first!) vc2.displayedPropertyKeys = [CNContactNonGregorianBirthdayKey, CNContactBirthdayKey, CNContactDatesKey] self.navigationController?.pushViewController(vc2, animated: true) } func fetchContactsWithBirthday() -> [CNContact] { var contacts: [CNContact] = [] let contactStore = CNContactStore() let keys = CNContactViewController.descriptorForRequiredKeys() let fetchReq = CNContactFetchRequest.init(keysToFetch: [CNContactGivenNameKey,CNContactFamilyNameKey, CNContactBirthdayKey, CNContactNicknameKey, CNContactImageDataAvailableKey, CNContactImageDataKey, CNContactThumbnailImageDataKey] as [CNKeyDescriptor]) fetchReq.keysToFetch.append(keys) do { try contactStore.enumerateContacts(with: fetchReq) { (contact, end) in if contact.birthday != nil { contacts.append(contact) } } } catch { print(error) } return contacts } }AppDelegate : func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool { window = UIWindow(frame: UIScreen.main.bounds) window?.makeKeyAndVisible() let vc = MyViewController() window?.rootViewController = UINavigationController(rootViewController: vc) return true }