What am I doing wrong on trying to set data to Struct - swift

Question

I'm trying to create a Struct to be able to pass data between screens. However, when I set data to my Struct properties and then I try to use it in another screen I got the value as "nil". What am I doing wrong?
Objects Struct:
import UIKit
struct Objetos {
var nome: String
var foto: UIImage
}
That's how I'm trying to set the value:
var objeto = Objeto(nome: "", foto: UIImage())
#IBAction func botaoAdcItem(_ sender: UIButton) {
if (self.namePreview!.text != nil) && (self.imagePreview!.image != nil) {
objeto?.nome = self.namePreview.text!
objeto?.foto = self.imagePreview.image!
self.navigationController?.popViewController(animated: true)
}
else { return }
}
That's how I'm trying to read the data:
class ViewController: UIViewController, CLLocationManagerDelegate, UITableViewDataSource {
#IBOutlet weak var itensTableView: UITableView!
var arrayNomes = NSMutableArray()
var objeto: Objetos?
var objetos = [Objetos]()
//TableView
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
for nome in objetos {
arrayNomes.add(nome)
}
return arrayNomes.count //Nil value
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = itensTableView.dequeueReusableCell(withIdentifier: "cellId", for: indexPath) as! tableviewCell
cell.nameCell.text = objeto?.nome //Nil value
cell.imageViewCell.image = objeto?.foto //Nil value
return cell
}
override func viewDidAppear(_ animated: Bool) {
self.itensTableView.reloadData()
}
Storyboard:

Answer 1

In your second code snippet, you never initialize objetos to anything. Thus, when you try to set one of the properties on objetos, nothing happens, because objetos doesn't exist.
Solution: Initialize objetos before trying to use it.

Answer 2

You can try this if you want to set the data to the previous VC
// ! won't crash
let count = self.navigationController.viewControllers!.count
let tab = self.navigationController.viewControllers![count-2] as! UITabBarController
let vc = tab.viewControllers![0] as! ViewController
vc.objetos.append(Objetos(name:self.namePreview.text!,foto:self.imagePreview.image!))
self.navigationController?.popViewController(animated: true)
plus
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let item = objectos[indexPath.row]
let cell = itensTableView.dequeueReusableCell(withIdentifier: "cellId", for: indexPath) as! tableviewCell
cell.nameCell.text = item.nome //Nil value
cell.imageViewCell.image = item.foto //Nil value
return cell
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return objetos.count
}

Answer 3

Try to replace
var objetos:Objetos?
with
var objeto = Objetos(nome: "", foto: UIImage())
you are starting your object as optional, and thus from the start is nil. When you try to assign properties in your struct you are failures because the object from the beginning is nonexistent
Regarding you other nil values, here is a revised view of your snippet
class ViewController: UIViewController, CLLocationManagerDelegate, UITableViewDataSource {
#IBOutlet weak var itensTableView: UITableView!
var objetos = [Objetos]()
//TableView
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return objetos.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = itensTableView.dequeueReusableCell(withIdentifier: "cellId", for: indexPath) as! tableviewCell
let objeto = objectos[indexPath.row]
cell.nameCell.text = objeto.nome
cell.imageViewCell.image = objeto.foto
return cell
}
override func viewWillAppear(_ animated: Bool) {
self.itensTableView.reloadData()
}
In your Additional Novo Itens Vc you are going to need to pass the created data back to your original View Controller, one way to do this is
#IBAction func botaoAdcItem(_ sender: UIButton) {
if (self.namePreview!.text != nil) && (self.imagePreview!.image != nil) {
// create the objecto
var objeto = Objetos(nome: namePreview.text,
foto: imagePreview.image)
// create a reference to your previous view controller
let vc = self.navigationController?.viewControllers[0] as! ViewController
// add objecto to objectos
vc.objetos.append(objeto)
self.navigationController?.popViewController(animated: true)
}
else { return }
}