Get values from a view controller's text field - ios

Question

I have 2 view controllers and a swift file. I wish to pass the data from one view controller to the other without using segue or presenting the other view controller.
View controller:
import UIKit
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
var questions:[Question] = []
var sub = ""
var send = ""
var det = ""
#IBOutlet weak var questionsender: UISegmentedControl!
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
self.tableView.reloadData()
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return questions.count
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 50
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "forumcell", for: indexPath) as! ForumTableViewCell
cell.questionsubject.text = questions[indexPath.row].subject
cell.sender.text = questions[indexPath.row].sender
return cell
}
}
Swift file:
import Foundation
class Question
{
var subject = ""
var descript = ""
var sender = ""
init(subject : String, descrip: String,sender : String)
{
self.sender=sender
self.descript=descrip
self.subject=subject
}
}
Second view controller:
import UIKit
class AddVC: UIViewController,UITextFieldDelegate {
var qsender = ""
var subject = ""
var details = ""
#IBAction func postBttn(_ sender: Any) {
if questiondetails.text == "" || question_sender.text == "" || question_subject.text == ""
{
let alert = UIAlertController(title: "Invalid!", message: "One of the fields has not been entered", preferredStyle: .alert)
let bttn = UIAlertAction(title: "Ok", style: .cancel, handler: nil)
alert.addAction(bttn)
}
else
{
qsender = question_sender.text
subject = question_subject.text
details = questiondetails.text
let q=Question(subject: subject, descrip: details, sender: qsender)
let v = ViewController()
v.send = qsender
v.sub = subject
v.det = details
dismiss(animated: true, completion: nil)
}
}
#IBAction func closeBttn(_ sender: Any) {
dismiss(animated: true, completion: nil)
}
#IBOutlet weak var question_subject: UITextView!
#IBOutlet weak var question_sender: UITextView!
#IBOutlet weak var closeBttn: UIButton!
#IBOutlet weak var questiondetails: UITextView!
override func viewDidLoad() {
super.viewDidLoad()
question_subject.placeholderText="Sender"
question_subject.placeholderText="Subject"
questiondetails.placeholderText="Description"
let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(swiped(_ :)))
swipeDown.direction = .down
self.view.addGestureRecognizer(swipeDown)
}
func swiped(_ gesture:UISwipeGestureRecognizer)
{
dismiss(animated: true, completion: nil)
}
}
The object v I created for View Controller cannot update the data members through the AddVC class.

Answer 1

in ViewController:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let destination = segue.destination as! AddVC
destination.callbackFromAddVC = { stringData in
// use stringData
}
}
in AddVC:
var callbackFromAddVC: ((String) -> Void)? = nil
func swiped(_ gesture:UISwipeGestureRecognizer)
{
self.callbackFromAddVC?("myStringData that needs to be transferred")
dismiss(animated: true, completion: nil)
self.callbackFromAddVC = nil
}

Answer 2

Add this line to ViewController:
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
static let viewControllerSegueIdentifier: String = "ViewController"
Make sure that the viewControllerSegueIdentifier string matches your segue identifier.
Then make these edits to AddVC:
#IBAction func postBttn(_ sender: Any) {
if questiondetails.text == "" || question_sender.text == "" || question_subject.text == ""
{
let alert = UIAlertController(title: "Invalid!", message: "One of the fields has not been entered", preferredStyle: .alert)
let bttn = UIAlertAction(title: "Ok", style: .cancel, handler: nil)
alert.addAction(bttn)
}
else
{
qsender = question_sender.text
subject = question_subject.text
details = questiondetails.text
dismiss(animated: true, completion: {
goToAddScreen(segueIdentifier: ViewController.viewControllerSegueIdentifier)
})
}
}
Then add these 2 methods:
func goToAddScreen(segueIdentifier: String) {
performSegue(withIdentifier: segueIdentifier, sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == ViewController.viewControllerSegueIdentifier {
guard let controller = segue.destination as? ViewController else {
return
}
let q=Question(subject: subject, descrip: details, sender: qsender)
controller.questions.append(q)
}
}