How to get data from popup view controller to cust

Question

I have 3 view controllers. First is MainViewController.

In this MainViewController has custom table view cell as FoodCell class with two property as name and price.

I instantiate this objects in MainViewController and when tap to table view cell this objects pass to popup DetailViewController which is not table view it is only View with labels(foodName and foodPrice labels) and AddToBasket button.

And finally I want to pass this class objects from popup DetailViewController to MyCartViewController. MyCartViewController is my final scene for show the foodNames and foodPrices objects.

(e.g. MainViewController is my food menu list. DetailViewController is my selected foods list.MyCartViewController is my market bag. )

MainViewController(Food Menu List)

import UIKit

class MainViewController: UIViewController, UITableViewDataSource, UITableViewDelegate,
UICollectionViewDelegate, UICollectionViewDataSource,   UICollectionViewDelegateFlowLayout {

@IBOutlet weak var searchBar: UISearchBar!
@IBOutlet weak var mainTableView: UITableView!

var imageNames = [ImageNames]()
var searchFoods: [String]!
var priceFood: [Double]!
var searching = false


override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    self.tabBarController?.tabBar.isHidden = false
}

override func viewDidLoad() {
    super.viewDidLoad()

    self.navigationController?.navigationBar.isHidden = true
    let foodCell = Food(name: ["Hamburger big mac",
                               "Patates",
                               "Whopper",
                               "Steakhouse"], price: [15.0, 20.0, 25.0, 30.0])

    searchBar.delegate = self
    searchFoods = foodCell.name
    priceFood = foodCell.price

    imageNames = [
        ImageNames(name: "images"),
        ImageNames(name: "unnamed"),
        ImageNames(name: "unnamed")
    ]

}

func numberOfSections(in tableView: UITableView) -> Int {
    return 2
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    return section == 0 ? 1 : searchFoods.count
}

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return indexPath.section == 0 ? 130 : 65
}

func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
    return indexPath.section == 0 ? 100 : 65
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    if indexPath.section == 0 {
        let cell = tableView.dequeueReusableCell(withIdentifier: "MainFoodTableViewCell", for: indexPath) as! MainFoodTableViewCell

        cell.mainFoodCollectionView.delegate = self
        cell.mainFoodCollectionView.dataSource = self
        cell.mainFoodCollectionView.reloadData()
        cell.mainFoodCollectionView.tag = indexPath.row
        return cell

    } else {

        let cell = tableView.dequeueReusableCell(withIdentifier: "CellForFood", for: indexPath) as! MainFoodTitleTableViewCell

        cell.titleLabel?.text = searchFoods[indexPath.row]
        cell.priceLabel?.text = priceFood[indexPath.row].description

        return cell
    }

}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "cellForFoodSegue" {
        if let destinationViewController = segue.destination as? DetailViewController
        {
            let indexPath = self.mainTableView.indexPathForSelectedRow!

            var foodNameArray: [String]
            var foodPriceArray: [Double]

            foodNameArray = [searchFoods[indexPath.row]]
            foodPriceArray = [priceFood[indexPath.row]]

            destinationViewController.detailFoodName = foodNameArray
            destinationViewController.detailFoodPrice = foodPriceArray

        }

    }
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return  imageNames.count
}

//MARK:- collection view cell size
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    let width = UIScreen.main.bounds.width
    return CGSize(width: width, height: 130)
}

//MARK:- //collection view cell data
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "MainFoodCollectionViewCell", for: indexPath) as! MainFoodCollectionViewCell
    let img = imageNames[indexPath.row]
    cell.mainFoodImage.image = UIImage(named: img.name)
    return cell
}
}

DetailViewController(Selected Foods List)

import UIKit

class DetailViewController: UIViewController {

@IBOutlet weak var foodTitle: UILabel!
@IBOutlet weak var foodSubTitle: UILabel!
@IBOutlet weak var foodPiece: UILabel!
@IBOutlet weak var foodPrice: UILabel!
@IBOutlet weak var drinkPicker: UITextField!
@IBOutlet weak var menuPieceStepper: UIStepper!

var drinkPickerView = UIPickerView()

var selectDrinkType: [String] = []
var detailFoodName : [String] = []
var detailFoodPrice : [Double] = [0.0]



let foods = Food(name: ["Hamburger big mac",
                           "Patates",
                           "Whopper",
                           "Steakhouse"], price: [15.0, 20.0, 25.0, 30.0])


@IBAction func foodPieceStepper(_ sender: Any) {
}

@objc func foodPieceChangeStepper() {
    let res = menuPieceStepper.value + foods.price.first!
    foodPrice.text = "\(res)"
}

//TODO:- Add to basket
    @IBAction func addBasket(_ sender: Any) {

        let destinationVC = MyCartViewController()

        destinationVC.fromDetailFoodNames = foods.name
        destinationVC.fromDetailFoodPrices = foods.price
   }

  override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
   if(segue.identifier == "addToCartSegue") {
        if let addToCartVC = segue.destination as? MyCartViewController  {   
            addToCartVC.fromDetailFoodNames = [foodTitle.text]
            addToCartVC.fromDetailFoodPrices = foods.price
    }
   }
}

override func viewDidLoad() {
    super.viewDidLoad()

    menuPieceStepper.value = 0.0
    menuPieceStepper.minimumValue = 0.0
    menuPieceStepper.maximumValue = 30.0
    menuPieceStepper.stepValue = foods.price.first!
    menuPieceStepper.addTarget(self, action: #selector(foodPieceChangeStepper), for: .valueChanged)

    drinkPickerView.delegate = self
    drinkPicker.inputView = drinkPickerView
    selectDrinkType = ["Ayran", "Kola", "Su", "Fanta", "Şalgam", "Sprite"]

    foodTitle.text = detailFoodName.description
    foodPrice.text = detailFoodPrice.description


    self.navigationController?.navigationItem.title = "Sipariş Detayı"
    let tapGesture = UITapGestureRecognizer(target: self, action:     #selector(self.dismissKeyboard (_:)))
    self.view.addGestureRecognizer(tapGesture)
}
@objc func dismissKeyboard (_ sender: UITapGestureRecognizer) {
   drinkPicker.resignFirstResponder()
}

override func viewWillAppear(_ animated: Bool) {
    self.navigationController?.navigationBar.isHidden = false

}

override func viewWillDisappear(_ animated: Bool) {
    self.navigationController?.navigationBar.isHidden = true
}
}

extension DetailViewController: UIPickerViewDelegate,    UIPickerViewDataSource {
func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return selectDrinkType.count
}

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return selectDrinkType[row]
}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    let selectedDrink = selectDrinkType[row]
    drinkPicker.text = selectedDrink
}

}

MyCartViewController(My Grocery Bag)

import UIKit

class MyCartViewController: UIViewController, UITableViewDataSource,   UITableViewDelegate {

var fromDetailFoodNames: [String?] = []
var fromDetailFoodPrices: [Double?] = []

@IBOutlet weak var myCartTableView: UITableView!
@IBOutlet weak var totalPriceLabel: UILabel!


let foodNames = [
    "Hamburger big mac",
    "Cemal",
    "Emre",
    "Memo"
]

//TODO-: Delete my cart
@IBAction func deleteMyCart(_ sender: Any) {
}

//TODO: - Approve my  cart
@IBAction func approveCart(_ sender: Any) {
}


override func viewDidLoad() {
    super.viewDidLoad()
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    return section == 0 ? 1 : foodNames.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

     let cell = tableView.dequeueReusableCell(withIdentifier: "myCartCell", for: indexPath) as! MyCartTableViewCell

    if indexPath.section == 1 && indexPath.last! <= fromDetailFoodPrices.indices.last! {

    let name = fromDetailFoodNames[indexPath.row]?.description ?? ""
    let price = fromDetailFoodPrices[indexPath.row]
    cell.myCartFoodNameLabel?.text = name
    cell.myCartFoodPriceLabel?.text = "\(String(describing: price))₺"

}
    return cell    
}
}

Answer 1

// Create Custom delegate for him

// eg:- On PopUp View Controller 
// Create protocol
protocol PopUpVCDelegate: class {

    func refresh(text: String) 
}
// declare delegate var
  weak var delegate:PopUpVCDelegate?

// puting value on it 
   self.delegate?.refresh(text: self.mDateTxtFld.text!)

// On Main ViewController (Recieving Data Class)  
extension MainViewController: PopUpVCDelegate {
    func refresh(text: String) {
        self.dateLbl.text = text

    }
}
// and don't forget to call or connect delegate when you present or push popup Vc
//like 

let resultController = self.storyboard?.instantiateViewController(withIdentifier: "PopUpVCID") as? PopUpVC       

        resultController?.delegate = self
  self.present(resultController!, animated: true, completion: nil)

// Hope Its work for you!