How to get a CNContact phone number(s) as string in Swift?

Question

I am attempting to retrieve the names and phone number(s) of all contacts and put them into arrays with Swift in iOS. I have made it this far:

Answer 1

Here is how you do it in swift 4

func contactPicker(_ picker: CNContactPickerViewController, didSelect contactProperty: CNContactProperty) {

    if let phoneNo = contactProperty.value as? CNPhoneNumber{
        txtPhone.text = phoneNo.stringValue
    }else{
        txtPhone.text=""
    }
}