How to send data from TextField from second view controller to first view controller and add this data to array swift iOS [duplicate] - ios

Question

This question already has answers here:
Passing data between view controllers
(45 answers)
Closed 3 years ago.
I want to send data from TextField from second view controller to first view controller and add this data to an array
I have a struct which I will save to array:
struct ContactsModel {
var name : String
var surname : String
var phoneNumber : String
}
first VC:
class FirstViewController: UIViewController {
var contacts : [ContactsModel] = []
}
second VC:
class SecondViewController: UIViewController {
#IBOutlet weak var nameTextField: UITextField!
#IBOutlet weak var surnameTextField: UITextField!
#IBOutlet weak var phoneNumberTextField: UITextField!
#IBAction func saveAndClose(_ sender: UIButton) {
// here i want to send this objects (nameTextField, surnameTextField, phoneNumberTextField) in array in first VC when i press this button
}
}

Answer 1

You can accomplish this using a delegate:
struct ContactsModel {
var name : String
var surname : String
var phoneNumber : String
}
protocol SecondViewControllerDelegate: class {
func savedAndClosed(with model: ContactsModel)
}
class FirstViewController: UIViewController {
var contacts : [ContactsModel] = []
// Whereever you create and present your instance of SecondViewController make it conform to the delegate
func showSecondVC() {
let secondVC = SecondViewController()
secondVC.delegate = self
present(secondVC, animated: true, completion: nil)
}
}
extension FirstViewController: SecondViewControllerDelegate {
func savedAndClosed(with model: ContactsModel) {
contacts.append(model)
}
}
class SecondViewController: UIViewController {
#IBOutlet weak var nameTextField: UITextField!
#IBOutlet weak var surnameTextField: UITextField!
#IBOutlet weak var phoneNumberTextField: UITextField!
weak var delegate: SecondViewControllerDelegate?
#IBAction func saveAndClose(_ sender: UIButton) {
// here i want to send this objects (nameTextField, surnameTextField, phoneNumberTextField) in array in first VC when i press this button
guard let name = nameTextField.text, let surname = surnameTextField.text, let phoneNumber = phoneNumberTextField.text else { return }
let new = ContactsModel(name: name, surname: surname, phoneNumber: phoneNumber)
delegate?.savedAndClosed(with: new)
}
}

Answer 2

First be sure to make var contacts in FirstViewController static:
class FirstViewController: UIViewController {
static var contacts : [ContactsModel] = []
}
Then in SecondViewController you can edit variable "contacts" like this:
class SecondViewController: UIViewController {
#IBOutlet weak var nameTextField: UITextField!
#IBOutlet weak var surnameTextField: UITextField!
#IBOutlet weak var phoneNumberTextField: UITextField!
#IBAction func saveAndClose(_ sender: UIButton) {
// here i want to send this objects (nameTextField, surnameTextField, phoneNumberTextField) in array in first VC when i press this button
FirstViewController.contacts.append(ContactsModel(name: nameTextField.text ?? "defaultName", surname: surnameTextField.text ?? "defaultSurname", phoneNumber: phoneNumberTextField.text ?? "defaultPhone"))
}
}
You need to define default values so even if text from field would be nil your app won't crush, in example we set default values here:
name: nameTextField.text ?? "defaultName"