Wsrtjtyk

My code reads cities array to a tableView.

• When a cell is clicked, it move to a SecondViewController. The SecondViewController has a button.




• If I clicked the button, it will display an image into that cell.

Problem: I am trying to update the cell whenever the button is clicked. It is working but no matter which cell is clicked, it always displays the image for cell 3, if I clicked again it displays for cell number 1 image.

How to fix this so that when the button is clicked, it display the image for it's cell and if the same cell is clicked, hide the image.

My codes:

var first = 0

var reload = false

var cellNumber: Int!



var cities:[String] = ["paris", "moscow", "milan","rome","madrid","garda","barcelona"]



@IBOutlet weak var tableView: UITableView!

// func to reload a cell

@objc func toReload(rowNumber: Int){

    reload = true



    let indexPath = IndexPath(row: rowNumber , section: 0)

    tableView.reloadRows(at: [indexPath], with: .none)

}



// load tableview from a SecondViewController call

@objc func loadList(notification: NSNotification){



    self.tableView.reloadData() // reload tableview

    toReload(rowNumber: cellNumber)



}



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

    return cities.count



}



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

    let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! CustomCell



    cell.label1.text = cities[indexPath.row]



    let image : UIImage = UIImage(named: "20870718")! // assign imageView to an image



    if first == 0 {

       cell.myimage.isHidden = true // hide image

        first = 1 // condition to never enter again

    }



    if reload == true {



        if cell.myimage.isHidden == true {

             cell.myimage.image = image

             cell.myimage.isHidden = false

        }

        else{

            cell.myimage.isHidden = true

        }

        reload = false



    }



    return cell

}



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

    self.cellNumber = indexPath.row



    performSegue(withIdentifier: "send", sender: self)

}





override func viewDidLoad() {

    super.viewDidLoad()

    tableView.reloadData()



     NotificationCenter.default.addObserver(self, selector: #selector(loadList), name: NSNotification.Name(rawValue: "load"), object: nil)

    // call load list method

}

}

SecondViewController:

@IBAction func displayImage(_ sender: Any) {



    NotificationCenter.default.post(name: NSNotification.Name(rawValue: "load"), object: nil)



}

There is a problem in your cellForRowAt.when secondViewController notify the first one no matter which cell you are reloading cellForRowAt always will be called because when you scroll tableView wants to recuse cell and reload == true becomes true for all cells.so you have to check if indexPath.row == cellNumber then do the rest work :

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

   let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! CustomCell

   cell.label1.text = cities[indexPath.row]

   let image : UIImage = UIImage(named: "20870718")! // assign imageView to an image

   if first == 0 {

      cell.myimage.isHidden = true // hide image

      first = 1 // condition to never enter again

   }

   if indexPath.row == cellNumber {

     if reload == true {

        if cell.myimage.isHidden == true {

          cell.myimage.image = image

          cell.myimage.isHidden = false

        }

        else {

            cell.myimage.isHidden = true

        }

        reload = false

      }

   }

   return cell

}