how to add Checkmark TableView Multiple Swift 3.0 - ios

Question

I want to make the user multiple choice (years) or choose (all) and the rest of the cells disappear (checkmark).
I want the user can not cancel each (checkmark).
This My Code :-
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let cell = tableView.cellForRow(at: indexPath)
cell?.accessoryType = .checkmark
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! yearsCell
cell.years?.text = Years[indexPath.row]
return cell }

Answer 1

The way I do this is by storing the selectedindexPath's in an array, then reload the tableView to change the cells that were selected, this way you avoid problems with cell re-use, this might look like this (un-tested).
var selectedIndexPathArray = Array<NSIndexPath>()
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let cell = tableView.cellForRow(at: indexPath)
selectedIndexPathArray.append(indexPath)
tableView.reloadData()
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! yearsCell
cell.years?.text = Years[indexPath.row]
cell.accessoryType = .none
for sip in selectedIndexPathArray {
if indexPath == sip {
cell.accessoryType = .checkmark
}
}
return cell
}

Answer 2

Like So:
SWIFT 3
// To checkmark the cell
let cell = tableView.cellForRow(at:indexPath.row)
cell.accessoryType = .checkmark
// To make it unselectable
Use the tableView:willSelectRowAtIndexPath: method and check if the indexPath.row is the row for the cell you just selected, and return false.

Answer 3

The cell is reusable. For example, the cell used to display 1st row might be used to display 10th row when scroll down. Therefore, you need a array store the checkmark status for each row, some code like:
didSelect: array[indexpath.row] = !array[indexpath.row]
cellForRow: setCheckmark(array[indexpath.row])
MORE: google how and why a cell is reused in tableview