TableView CheckMark and Uncheck With Scroll Up Still Checked Cell Value In Ios Swift 4

Question

TableView CheckMark Cell Value Removed After Scrolling Up It will Fix TableView in You have face a problem many times to Checkmark after scroll Up then Scro

Answer 1

You are strongly discouraged from using a second array to keep the selected state.

This is Swift, an object oriented language. Use a custom struct for both num and the selected state.
In didSelectRowAt and didDeselectRowAt change the value of isSelected and reload the row.

And use always the dequeueReusableCell API which returns a non-optional cell.

struct Item {
   let num : Int
   var isSelected : Bool
}

var numarr = [Item]()

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return numarr.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "id", for: indexPath)
    let item = numarr[indexPath.row]
    cell.textLabel?.text = String(item)
    cell.accessoryType = item.isSelected ? .checkmark : .none
    return cell
}

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    updateSelection(at: indexPath, value : true)
}

func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
    updateSelection(at: indexPath, value : false)
}

func updateSelection(at indexPath: IndexPath, value : Bool) {
    let item = numarr[indexPath.row]
    item.isSelected = value
    tableView.reloadRows(at: [indexPath], with: .none)
}

override func viewDidLoad() {
    super.viewDidLoad()
    (0...100).map{Item(num: $0, isSelected: false)}
}