segue won't unwind

When you right click in IB on the button, do you see the triggered segue reference ?

In the view controller, you need to have :

    @IBAction func unwindToViewController(sender: UIStoryboardSegue) {      
          // No  need to have any code inside
    }

Yes. I see it.

I think that was the problem. I created an IBAction for the bar button item and it now works. Thank you.

Now the code in the IBAction for the bar button item isn't running.

Can you show the code ?

Did you insert a print at the beginning to check it's being called ?

Yes, I put a print at the beginning. It isn't executed.

    @IBAction func actionUnwindToMainViewController(_ sender: UIBarButtonItem) {
       
        print("actionUnwindToMainViewController(_:)")
       
        let appDelegate = UIApplication.shared.delegate as! AppDelegate
       
        let managedContext = appDelegate.persistentContainer.viewContext
       
        let entity = NSEntityDescription.entity(forEntityName: "Recipient", in: managedContext)!
        print("contacts.count = \(contacts.count)")
       
        for contact in contacts {
           
            if contact.flagImport {
               
                let recipient = NSManagedObject(entity: entity, insertInto: managedContext)
               
                recipient.setValue(contact.name, forKey: "name")
                recipient.setValue(contact.phoneNumber, forKey: "phoneNumber")
                recipient.setValue((contact.providerId), forKey: "providerId")
               
            }
           
        }
       
        do {
           
            try managedContext.save()
           
        } catch let error as NSError {
           
            print(error)
           
        }
       
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    }

Now the segue unwinds without there being an IBAction for the bar button item. I was able to delete it. This is very erratic.