/*

 Copyright (C) 2017 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Implements CNContactPickerViewController's predicateForEnablingContact

  instance property. Shows how to enable all contacts, only contacts that

  have an email address, only contacts with a postal address, only contacts that

  have 2 or more phone numbers, and only contacts that have a profile picture in

  the contact picker view. Users would be able to select enabled contacts and

  view their details. Contacts, which don't meet the above criteria, would be

  disabled in the picker view.

 */

import UIKit

import ContactsUI

class ForEnablingContactViewController: BaseTableViewController {

 // MARK: - Handle All Contacts

 /// Enable all contacts in the contacts picker view.

 override func handleAllContacts() {

    let picker = CNContactPickerViewController()

    navigationController?.present(picker, animated: true, completion: nil)

 }

 // MARK: - Handle Contacts With Email Addresses

 /// Only enable contacts with email addresses in the contacts picker view.

 override func handleContactsWithEmailAddresses() {

    let picker = CNContactPickerViewController()

    // Only show contacts with email addresses.

    picker.predicateForEnablingContact = NSPredicate(format: "emailAddresses.@count > 0")

    navigationController?.present(picker, animated: true, completion: nil)

 }

 // MARK: - Handle Contacts With Postal Addresses

 /// Only enable contacts with postal addresses in the contacts picker view.

 override func handleContactsWithPostalAddresses() {

    let picker = CNContactPickerViewController()

    // Only show contacts with postal addresses.

    picker.predicateForEnablingContact = NSPredicate(format: "postalAddresses.@count > 0")

    navigationController?.present(picker, animated: true, completion: nil)

 }

 // MARK: - Handle Contacts With Two or More Phone Numbers

 /// Only enable contacts with 2 or more phone numbers in the contacts picker view.

 override func handleContactsWithPhoneNumbers() {

    let picker = CNContactPickerViewController()

    // Only show contacts with two or more phone numbers.

    picker.predicateForEnablingContact = NSPredicate(format: "phoneNumbers.@count > 1")

    navigationController?.present(picker, animated: true, completion: nil)

 }

  // MARK: - Handle Contacts With Profile Picture

 /// Only enable contacts with a profile picture in the contacts picker view.

 override func handleContactsWithProfilePicture() {

    let picker = CNContactPickerViewController()

    // Only show contacts with a profile picture.

    picker.predicateForEnablingContact = NSPredicate(format: "imageDataAvailable == true")

    navigationController?.present(picker, animated: true, completion: nil)

 }

}