fetch contacts io6

gistfile1.m

- (void)fetchContacts:(void (^)(NSArray *contacts))success failure:(void (^)(NSError *error))failure {
  if (ABAddressBookRequestAccessWithCompletion) {
    // on iOS 6

    CFErrorRef err;
    ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, &err);
    ABAddressBookRequestAccessWithCompletion(addressBook, ^(bool granted, CFErrorRef error) {
      // ABAddressBook doesn't gaurantee execution of this block on main thread, but we want our callbacks to be
      dispatch_async(dispatch_get_main_queue(), ^{
        if (!granted) {
          failure((__bridge NSError *)error);
        } else {
          readAddressBookContacts(addressBook, success);
        }
      });
    });
  } else {
    // on iOS < 6

    ABAddressBookRef addressBook = ABAddressBookCreate();
    readAddressBookContacts(addressBook, success);
  }
}

static void readAddressBookContacts(ABAddressBookRef addressBook, void (^completion)(NSArray *contacts)) {
  // do stuff with addressBook
  NSArray *contacts = @[];

  completion(contacts);
}

how can i call the fetchContacts method?