How extract from UITableView data (UIImage and String) to another ViewController - ios

Question

I want to pass the storage data contained in a TableView and pass it to another ViewController. My customCell has an UIImage and a String.
When the user press the cell I want to show a "detail view controller" with the UIImage and a label containing the info of the cell selected.
Here is my code:
import UIKit
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet weak var dataTableView: UITableView!
var myList = [dataList]()
var textToBeSent: String = ""
var selectedImage: UIImage?
var selectedLabel: String?
//Load Items To List
func loaditems(){
let item1 = dataList(photoList: UIImage.self(), itemDescription: "Descripcion Aqui")
let item2 = dataList(photoList: UIImage.self(), itemDescription: "Aqui tmb")
myList += [item1,item2]
}
//var list = ["Documento 1", "Documento 2", "Documento 3"]
override func viewDidLoad() {
super.viewDidLoad()
if let savedData = loadSavedItems(){
myList += savedData
} else {
loaditems()
}
//dataTableView.register(UITableViewCell.self, forCellReuseIdentifier: "reusablecell")
// Do any additional setup after loading the view, typically from a nib.
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
return myList.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "prototype", for: indexPath) as! PrototypeCell
let itemsinCell = myList[indexPath.row]
cell.imageItem.image = itemsinCell.photoList
cell.itemDescription.text = String(itemsinCell.itemDescription)
return cell
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete{
myList.remove(at: indexPath.row)
dataTableView.reloadData()
}
saveToSavedData()
}
Here is the func where I want to pass the data of a certain cell.
The data is from a Swift file stored in a "DataList" using aDecoder NSCoder.
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("Row \(indexPath.row) selected")
selectedImage! = myList[indexPath.row].photoList
selectedLabel! = myList[indexPath.row].itemdescription
performSegue(withIdentifier: "selectedRowSegue", sender: myList[indexPath.row])
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if(segue.identifier == "selectedRowSegue"){
let chosenRowViewController = segue.destination as! chosenRowViewController
chosenRowViewController.image3 = selectedImage?.photoList
chosenRowViewController.label3 = selectedLabel?.itemDescription
}
}
Unwind a segue in order to fill up the cells with data from previous
ViewController:
//Unwinde Segue
#IBAction func unWindlToList(sender: UIStoryboardSegue){
if let sourceViewController = sender.source as? ProcessViewController, let item = sourceViewController.item{
let newIndexPath = IndexPath(row: myList.count, section: 0)
myList.append(item)
dataTableView.insertRows(at: [newIndexPath], with: .automatic)
}
saveToSavedData()
}
//Archive Data
func saveToSavedData(){
NSKeyedArchiver.archiveRootObject(myList, toFile: (dataList.fileFolder?.path)!)
}
//Unarchive Data
func loadSavedItems() -> [dataList]?{
return NSKeyedUnarchiver.unarchiveObject(withFile: (dataList.fileFolder?.path)!) as? [dataList]
}
}
class PrototypeCell: UITableViewCell {
#IBOutlet weak var itemDescription: UILabel!
#IBOutlet weak var imageItem: UIImageView!
}

Answer 1

just replace prepare(for segue: UIStoryboardSegue, sender: Any?) function with below code
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if(segue.identifier == "selectedRowSegue"), let list = sender as? dataList {
let chosenRowViewController = segue.destination as! chosenRowViewController
chosenRowViewController.image3 = list.photoList
chosenRowViewController.label3 = list.itemDescription
}
}

Answer 2

There are several things that stand out.
1- var myList = [dataList]() dataList is a Class, classes should be capitalized. It should be var myList = [DataList]()
2- You have this as a class property but it's not used anywhere in the code you posted so why did you add it and what is it's purpose? var textToBeSent: String = ""
3- You have these 2 class property variables
var selectedImage: UIImage?
var selectedLabel: String?
to hold the data from [myList] but you really don't need them because you can just access the data from [myList] using dot notation inside prepareForSegue (read the commented out code in prepareForSegue).
4- In prepareForSegue you have let chosenRowViewController = segue.destination as! chosenRowViewController. ChosenRowViewController is a class and it should be capitalized like so:
let chosenRowViewController = segue.destination as! ChosenRowViewController // it's capitalized after the as!
Here's the code a little cleaned up.
#IBOutlet weak var dataTableView: UITableView!
var myList = [DataList]()
func loaditems(){
let item1 = dataList(photoList: UIImage.self(), itemDescription: "Descripcion Aqui")
let item2 = dataList(photoList: UIImage.self(), itemDescription: "Aqui tmb")
myList.append(item1)
myList.append(item2)
}
override func viewDidLoad() {
super.viewDidLoad()
// everything you already have inside here...
}
// your tableView datasource methods...
5- Since your using prepareForSegue you don’t need didSelectRowAt indexPath
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if(segue.identifier == "selectedRowSegue"){
// get the indexPath for the selectedRow
let indexPath = tableView.indexPathForSelectedRow
let chosenRowViewController = segue.destination as! ChosenRowViewController
chosenRowViewController.image3 = myList[indexPath!.row].photoList // use dot notation to access the photoList property
chosenRowViewController.label3 = myList[indexPath!.row].itemDescription // use dot notation to access the itemDescription property
}
}

Answer 3

You have made a mistake in your didSelectRowAt, while calling performSegue you have to pass the controller which is the sender, in your case it is your current UIVIewController, so you have to write self as sender controller. So your corrected methog will look like below code snippet:
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("Row \(indexPath.row) selected")
selectedImage! = myList[indexPath.row].photoList
selectedLabel! = myList[indexPath.row]
performSegue(withIdentifier: "selectedRowSegue", sender: self)
}