setup navigation controller View Controller as a CNContactViewController black screen - swift

Question

I have a collection view with some cells representing a contact (their data has a phone number and name) and I am trying to add the contact to the iPhone contacts. I have created a segue from a button called "add contact" that is inside the CollectionViewCell to a navigation controller, and set its identifier as "ADD_CONTACT".
In the storyboard, my segue has a navigation controller with no root view controller.
in prepareToSegue of the view controller that delegates my UICollectionView I wrote this code:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == ADD_CONTACT {
let dest = segue.destination as! UINavigationController
if let cell = sender as? SBInstructionCell {
if cell.isContact {
let newContact = CNMutableContact()
if let phone = cell.instructionBean?.contactAttachment?.phoneNumber{
newContact.phoneNumbers.append(CNLabeledValue(label: "home", value: CNPhoneNumber(stringValue: phone)))
}
if let name = cell.instructionBean?.contactAttachment?.contactName {
newContact.givenName.append(name)
}
let contactVC = CNContactViewController(forNewContact: newContact)
contactVC.contactStore = CNContactStore()
contactVC.delegate = self
dest.setViewControllers([contactVC], animated: false)
}
}
}
}
this results with a black screen.
How can this be fixed? I want to see the CNContactViewController

Answer 1

Eventually I solved this in a different approach using Closures.
In my UICollectionViewCell
I added this var:
var closureForContact: (()->())? = nil
Now on my button's action in the same cell I have this func:
#IBAction func addContactTapped(_ sender: UIButton) {
if closureForContact != nil{
closureForContact!()
}
}
Which calls the function.
In my CollectionView in cell for item at index path, I set the closure like this:
cell.closureForContact = {
if cell.isContact {
let newContact = CNMutableContact()
if let phone = cell.instructionBean?.contactAttachment?.phoneNumber{
newContact.phoneNumbers.append(CNLabeledValue(label: "home", value: CNPhoneNumber(stringValue: phone)))
}
if let name = cell.instructionBean?.contactAttachment?.contactName {
newContact.givenName.append(name)
}
let contactVC = CNContactViewController(forNewContact: newContact)
contactVC.contactStore = CNContactStore()
contactVC.delegate = self
contactVC.allowsEditing = true
contactVC.allowsActions = true
if let nav = self.navigationController {
nav.navigationBar.isTranslucent = false
nav.pushViewController(contactVC, animated: true)
}
}
}
This worked perfectly. I learned that for navigating from a cell, it is best to use closures.