Passing data from UITableViewCell

Question

I faced a question when I tried to proceed on passing data from my UITableView to the other UIViewController. What should I do on my "If" statement to be able to pass the data on each selected cell? Can you guys give me a hand?

ViewController:

    import UIKit

    class ViewController: UIViewController, UICollectionViewDataSource, UITableViewDataSource, UITableViewDelegate {

        @IBOutlet weak var tableViewTopSell: UITableView!
        @IBOutlet var collectionView: UICollectionView!
        @IBOutlet weak var collectionViewBanner: UICollectionView!


        var dataSource: [Content] = [Content]()
        var dataBanner: [Banner] = [Banner]()
        var dataTopSold: [Top10] = [Top10]()

        override func viewDidLoad() {
            super.viewDidLoad()
            //Delegate TableView
            self.tableViewTopSell.delegate = self
            //SetupNavBarCustom
            self.navigationController?.navigationBar.CustomNavigationBar()
            let logo = UIImage(named: "tag.png")
            let imageView = UIImageView(image:logo)
            self.navigationItem.titleView = imageView
            //CallAPIData
            getTopSold { (data) in
                DispatchQueue.main.async {
                    self.dataTopSold = data
                    self.tableViewTopSell.reloadData()
                }
            }
            getBanner { (data) in
                DispatchQueue.main.async {
                self.dataBanner = data
                self.collectionViewBanner.reloadData()
                }
            }
            getAudiobooksAPI { (data) in
                DispatchQueue.main.async {
                    self.dataSource = data
                    self.collectionView.reloadData()
                }
            }
        }
        //CollectionView
        func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
            if (collectionView == self.collectionView) {
                return  self.dataSource.count
            }else{
                return self.dataBanner.count
            }}
        func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

            if (collectionView == self.collectionView) {
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionViewCell", for: indexPath) as! CollectionViewCell

            let content = self.dataSource[indexPath.item]

            cell.bookLabel.text = content.descricao
            cell.bookImage.setImage(url: content.urlImagem, placeholder: "")

            return cell

            }else if (collectionView == self.collectionViewBanner) {

                let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionViewCellBanner", for: indexPath) as! CollectionViewCell

                let content = self.dataBanner[indexPath.item]

                cell.bannerImage.setImage(url: content.urlImagem, placeholder: "")


                return cell
            }
            return UICollectionViewCell()
        }
    //TableView
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.dataTopSold.count
    }
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "topSoldCell", for: indexPath) as! TableViewCell

        let content = self.dataTopSold[indexPath.item]
        cell.labelNomeTopSell.text = content.nome
        cell.imageViewTopSell.setImage(url: content.urlImagem, placeholder: "")
        cell.labelPrecoDe.text = "R$ \(content.precoDe)"
        cell.labelPrecoPor.text = "R$ 119.99"
        return cell
    }
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

        performSegue(withIdentifier: "segueId", sender:self.dataTopSold[indexPath.item])

        }

        override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

            if segue.identifier == "segueId" {

                let des = segue.destination as! TelaDetalheProdutos

                des.stringNomeeDesc = sender as? String

            }
        }

    }

extension UIImageView{
    func setImage(url : String, placeholder: String, callback : (() -> Void)? = nil){
        self.image = UIImage(named: "no-photo")

        URLSession.shared.dataTask(with: NSURL(string: url)! as URL, completionHandler: { (data, response, error) -> Void in

            guard error == nil else{
                return
            }
            DispatchQueue.main.async(execute: { () -> Void in
                let image = UIImage(data: data!)
                self.image = image

                if let callback = callback{
                    callback()
                }


            })

        }).resume()
    }
}

AudioBook file:

import Foundation

//Categorias
struct Contents : Decodable {
    let data : [Content]
}
struct Content : Decodable {
    let id : Int
    let descricao : String
    let urlImagem : String
}
//Banner
struct BannerData : Decodable {
    let data : [Banner]
}
struct Banner : Decodable {
    let id : Int
    let urlImagem : String
    let linkUrl : String
}
//Top10
struct Top10Data:Decodable {
    let data: [Top10]
}
struct Top10:Decodable {
    let id : Int
    let nome : String
    let urlImagem : String
    let descricao : String
    let precoDe : Int
}

Detail ViewController:

import UIKit

class TelaDetalheProdutos: UIViewController {
    //Properties
    @IBOutlet weak var ImageView: UIImageView!
    @IBOutlet weak var labelNomeEDesc: UILabel!
    @IBOutlet weak var labelDe: UILabel!
    @IBOutlet weak var labelPor: UILabel!
    @IBOutlet weak var labelNomeProduto: UILabel!
    @IBOutlet weak var labelDescricao: UILabel!
    //Strings
    var stringImageView = String()
    var stringNomeeDesc = String()
    var stringLabelDe = String()
    var stringLabelPor = String()
    var stringNomeProduto = String()
    var stringlabeDescricao = String()

    override func viewDidLoad() {
        super.viewDidLoad()

    ***//What should I do here?***

    }

}

[Edit 1]:

I'm doing this way, but I got this crash:

Cannot assign value of type 'Top10' to type 'String'

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

    let content = self.dataTopSold[indexPath.item]
    cell.labelNomeTopSell.text = content.nome
    cell.imageViewTopSell.setImage(url: content.urlImagem, placeholder: "")
    cell.labelPrecoDe.text = "R$ \(content.precoDe)"
    cell.labelPrecoPor.text = "R$ 119.99"
    return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    performSegue(withIdentifier: "segueId", sender:self.dataTopSold[indexPath.row])

    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

         if segue.identifier == "segueId" {

        let des = segue.destination as! TelaDetalheProdutos

        des.stringNomeeDesc = sender as! Top10
    }
}

[Edit 3] -SOLVED - What happened was that in Storyboard I linked the UITableViewCell to the other screen instead of linking the ViewController. That's why it appeared twice.

When the screen does the transition after select the cell, the next screen containing the results appear automatically twice. The first time it has empty fields and after 1 second or less there's another automatically transition once again, but this time containing all the data I've passed. The same occur when I click in the "back" TopBar button. What might be happening?

Answer 1

You can try

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    performSegue(withIdentifier: "segueId", sender:self.dataTopSold[indexPath.row])

}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    if segue.identifier == "segueId" {

        let des = segue.destination as! TelaDetalheProdutos

        des.item = sender as! Top10
    }
}

//

class TelaDetalheProdutos: UIViewController {

   var item:Top10?

}

Answer 2

Save the selected indexpath in did select

In prepare for segue get the data and pass it on to the DetailViewController

//in prepare for segue
let content = self.dataTopSold[indexPath.item]
//cast segue.destination controller to DetailViewController and pass content
guard let detailViewController = segue.destinationViewController as? DetailViewController else {return}
detailViewController.content = content