问如何确定CNContact是最受欢迎的？

EN

[[CNContactStore new] requestAccessForEntityType:CNEntityTypeContacts completionHandler:^(BOOL granted, NSError *error) {
  if (granted) {
    NSArray *keys = @[CNContactNamePrefixKey,
                      CNContactGivenNameKey,
                      CNContactMiddleNameKey,
                      CNContactFamilyNameKey,
                      // ...
    NSString *containerId = store.defaultContainerIdentifier;
    NSPredicate *predicate = [CNContact predicateForContactsInContainerWithIdentifier:containerId];
    NSArray *cnContacts = [store unifiedContactsMatchingPredicate:predicate keysToFetch:keys error:&error];
    for (CNContact *contact in cnContacts) {
      // contacts fetching
    }
  }
}];