Swift UITableview cell checkmark with selection blink option - ios

Question

My scenario, I am trying to create UITableview single cell checkmark selection and Multiple cell check mark selection. Here, I am trying by below code for single selection check mark but Its reusability not working. Also, I don't know how to do multiple cell selection by clicking cell section.
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.tableView.deselectRow(at: indexPath, animated: true)
tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
tableView.cellForRow(at: indexPath)?.accessoryType = .none
}

Answer 1

For reusability, you need a variable to save the selected cell index(or array for cells) and then set the appropriate accessoryType when displaying the cell.
For single selection, remember to clear the previous selection.
A sample pattern for single selection:
var selectedRow = 0
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
selectedRow = indexPath.row
for cell in tableView.visibleCells { //Why not using didDeselectRowAt? Because the default selected row(like row 0)'s checkmark will NOT be removed when clicking another row at very beginning.
cell.accessoryType = .none
}
tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
cell.accessoryType = indexPath.row == selectedRow ? .checkmark : .none
}
A pattern for multiple selections (Updated for multi-sections):
var selectedIndexPaths = Set<IndexPath>()
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
if selectedIndexPaths.contains(indexPath) { //deselect
selectedIndexPaths.remove(indexPath)
tableView.cellForRow(at: indexPath)?.accessoryType = .none
}
else{
selectedIndexPaths.insert(indexPath) //select
tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
}
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
cell.accessoryType = selectedIndexPaths.contains(indexPath) ? .checkmark : .none
}

Answer 2

Model
class Item {
var name:String!
var isSelected = false
}
then inside cellForRowAt
cell.accessoryType = items[indexPath.row].isSelected ? .checkmark : .none
inside didSelectRowAt
items[indexPath.row].isSelected.toggle()
tableView.reloadRows(at:[indexPath],with:.none)

Answer 3

Set isSingleSelection to false for multiple selections and to true for single selection
var isCellSelected = [Bool]()
var isSingleSelection = false
override func viewDidLoad() {
super.viewDidLoad()
for _ in arrayFillingYourTableview { isCellSelected.append(false) }
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = branchTbView.dequeueReusableCell(withIdentifier: "cell")!
cell.accessoryType = isCellSelected[indexPath.row] ? .checkmark : .none
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
if isSingleSelection {
for i in 0..<isBranchSelected.count {
isCellSelected[i] = false
}
}
isCellSelected[indexPath.row] = ! isCellSelected[indexPath.row]
tableView.reloadData()
}
}