CODEWITHSUNDEEP
iosswiftcontactscncontact
Crashalot
Crashalot

Reputation: 34523

CNContactViewControllerDelegate not called when contact property selected/edited on iOS

The delegate for CNContactviewController is not called when properties get edited or selected.

When editing a new contact, the contactViewController(_ viewController: CNContactViewController, shouldPerformDefaultActionFor property: CNContactProperty) function is supposed to be called, but it's not.

How do you get notified when the user edits/selects a contact property?

Steps to reproduce:

  1. Copy the view controller below.
  2. Edit/select a contact property.

Expected behavior:

"yo" is printed every time you edit/select a property.

Actual behavior:

Nothing.

import Foundation
import Contacts
import ContactsUI


class ContactViewController: UIViewController, CNContactViewControllerDelegate {


    override func viewDidLoad() {
        super.viewDidLoad()

        createContact()
    }


    func createContact() {
        let contactController = CNContactViewController(forNewContact: nil)

        contactController.delegate = self
        contactController.allowsEditing = true
        contactController.allowsActions = true
        contactController.displayedPropertyKeys = [CNContactPostalAddressesKey, CNContactPhoneNumbersKey, CNContactGivenNameKey]

        contactController.view.layoutIfNeeded()

        present(contactController, animated:true)
    }


    // =============================================================================================================
    // MARK: CNContactViewControllerDelegate Functions
    // =============================================================================================================
    func contactViewController(_ viewController: CNContactViewController, didCompleteWith contact: CNContact?) {
        viewController.dismiss(animated: true, completion: nil)
        print("hi")
    }


    func contactViewController(_ viewController: CNContactViewController, shouldPerformDefaultActionFor property: CNContactProperty) -> Bool {
        print("yo")
        return true
    }


    // =============================================================================================================
    // MARK: UIViewController Functions
    // =============================================================================================================
    override var prefersStatusBarHidden: Bool {
        return true
    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

Upvotes: 0

Views: 1209

Answers (1)

matt
matt

Reputation: 535944

There are three initializers for making a CNContactViewController:

  • Existing contact: init(for:)
  • New contact: init(forNewContact:)
  • Unknown contact: init(forUnknownContact:)

The first and third forms call the delegate method contactViewController(_:shouldPerformDefaultActionFor:). The second form does not. That's the one you are using.

With the second flavor, the only event you get is contactViewController(_:didCompleteWith:), and at that point the new contact has already been saved into the database.

When editing a new contact, the contactViewController(_ viewController: CNContactViewController, shouldPerformDefaultActionFor property: CNContactProperty) function is supposed to be called

No, it isn't. That's just an idea you made up.

Expected behavior: "yo" is printed every time you edit/select a property.

Then stop expecting that.

How do you get notified when the user edits/selects a contact property?

You don't.

When you use a framework like Cocoa, you don't get to make up any expectations you like. Your expectations need to be based on what the framework actually does. You might wish that CNContactViewController and its delegate messages worked as you describe, and that might make a very good enhancement request to Apple. But it is not how it works in fact, so expecting it to do so won't do you any good.

Upvotes: 5

Related Questions