Getting contacts from address book

info.plist:
Privacy - Contacts Usage Description

Import ContactsUI

inherit from: CNContactPickerDelegate

In button click:
let cnPicker = CNContactPickerViewController()
        cnPicker.delegate = self
        self.present(cnPicker, animated: true, completion: nil)

Implement function:
func contactPicker(_ picker: CNContactPickerViewController, didSelect contact: CNContact) {
        let userName:String = contact.givenName
       
        // user phone number
        let userPhoneNumbers:[CNLabeledValue<CNPhoneNumber>] = contact.phoneNumbers
        let firstPhoneNumber:CNPhoneNumber = userPhoneNumbers[0].value
       
        // user phone number string
        let primaryPhoneNumberStr:String = firstPhoneNumber.stringValue
        print(primaryPhoneNumberStr)
    }
   
    func contactPickerDidCancel(_ picker: CNContactPickerViewController) {
        print("Cancel Contact Picker")
    }