Swift - TableView of steppers, click one stepper in a cell and other steppers get activated? - uitableview

Question

I am new to IOS and basically I have a tableView and whenever it has 40 cells and each cell has a stepper and a label. the label displays the stepper's value. The tableview generates the cells fine, but the problem is that whenever I click the stepper in one cell, some other random cells also have their steppers activated.This is swift by the way. Here is the code for the cell:
import UIKit
class StudentTableViewCell: UITableViewCell {
#IBOutlet weak var studentNameAndValue: UILabel!
#IBOutlet weak var studentValueChanger: UIStepper!
let name:String?
let value:Int?
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
#IBAction func stepperValueChanged(sender: AnyObject) {
studentNameAndValue.text = "\(name): \(Int(studentValueChanger.value))"
}
}
Here is the code for the viewcontroller:
import UIKit
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
tableView.delegate = self
tableView.dataSource = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 40
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("studentCell") as StudentTableViewCell
return cell
}
}

Answer 1

The problem is in your table view controller. It would be better to put the value-changed method there. Alternatively, review your cellForRowAtIndexPath method. You are not updating the cells correctly when they are recycled.
You have to set the value of stepper and label explicitly in cellForRowAtIndexPath. You cannot read these values from the cell - they should be in your datasource (i.e. the table view controller should know what to display for a given index path).
Connect the stepper handler to the method in the view controller, then identify the proper index path via the sender argument.
#IBAction func stepperChanged(sender: UIStepper) {
let point = sender.convertPoint(CGPointZero, toView: tableView)
let indexPath = self.tableView.indexPathForRowAtPoint(point)!
let myData = dataArray[indexPath.row] // or whatever your datasource
// if you need to update the cell
let cell = self.tableView.cellForRowAtIndexPath(indexPath)
}