UITableView Multi Selection's selected checkmark not remains checked - ios

Question

I have two UITableView in my application.
One is for Category and Second is for SubCategory.
On the basis of selected Category SubCategory UITableView, data will change, and SubCategory UITableView have multi-selection functionality, till this my application is working fine.
Now the problem is when I am on category UITableView and click on suppose Category cell it will redirect to the various subCategory, On that screen, I have selected multiple choices and click on back button appear on top, and when I click again on Category tab my selection(Checkmark) is disappearing.
I want my checkmark to be selected as long as I manually set them as unchecked.
How can I implement that thing?
Sample screenshot of my application attached below.
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let cell = tblSubCategory.cellForRow(at: indexPath)
if cell!.isSelected
{
cell!.isSelected = false
if cell!.accessoryType == UITableViewCell.AccessoryType.none
{
if strCategoryData == "Category" {
cell!.accessoryType = UITableViewCell.AccessoryType.checkmark
let objectForCell = arrSubCategoryData[indexPath.row]
arrSelectedCetegoryIndex.append(objectForCell)
let defaults = UserDefaults.standard
defaults.set(arrSelectedCetegoryIndex, forKey: "categoryKey")
}
else if strCategoryData == "Brand" {
cell!.accessoryType = UITableViewCell.AccessoryType.checkmark
let objectForCell = arrSubCategoryData[indexPath.row]
arrSelectedBrandIndex.append(objectForCell)
}
else if strCategoryData == "Color" {
cell!.accessoryType = UITableViewCell.AccessoryType.checkmark
let objectForCell = arrSubCategoryData[indexPath.row]
arrSelectedColorIndex.append(objectForCell)
}
else if strCategoryData == "Size" {
cell!.accessoryType = UITableViewCell.AccessoryType.checkmark
let objectForCell = arrSubCategoryData[indexPath.row]
arrSelectedSizeIndex.append(objectForCell)
}
}
else
{
if strCategoryData == "Category" {
cell!.accessoryType = UITableViewCell.AccessoryType.none
let selectedIndex = (tblSubCategory.indexPathForSelectedRow?.row)!
let selectedIndexValue = arrSubCategoryData[selectedIndex]
print(selectedIndexValue)
let index = arrSelectedCetegoryIndex.firstIndex(of: selectedIndexValue)!
arrSelectedCetegoryIndex.remove(at: index)
}
else if strCategoryData == "Brand" {
cell!.accessoryType = UITableViewCell.AccessoryType.none
let selectedIndex = (tblSubCategory.indexPathForSelectedRow?.row)!
let selectedIndexValue = arrSubCategoryData[selectedIndex]
print(selectedIndexValue)
let index = arrSelectedBrandIndex.firstIndex(of: selectedIndexValue)!
arrSelectedBrandIndex.remove(at: index)
}
else if strCategoryData == "Color" {
cell!.accessoryType = UITableViewCell.AccessoryType.none
let selectedIndex = (tblSubCategory.indexPathForSelectedRow?.row)!
let selectedIndexValue = arrSubCategoryData[selectedIndex]
print(selectedIndexValue)
let index = arrSelectedColorIndex.firstIndex(of: selectedIndexValue)!
arrSelectedColorIndex.remove(at: index)
}
else if strCategoryData == "Size" {
cell!.accessoryType = UITableViewCell.AccessoryType.none
let selectedIndex = (tblSubCategory.indexPathForSelectedRow?.row)!
let selectedIndexValue = arrSubCategoryData[selectedIndex]
print(selectedIndexValue)
let index = arrSelectedSizeIndex.firstIndex(of: selectedIndexValue)!
arrSelectedSizeIndex.remove(at: index)
}
}
}
}

Answer 1

You are probably performing a segue to go to the sub category view controller, and every time you perform this segue, tableview delegate and datasource methods are called again and cells are initialized all over again.
For you to show your cells checked you are going to need to save the checked values in the Categories view controller and pass them to the SubCategory View Controller and set the checked values in your cellForRowAtIndexpath method.
Here is an example on how to implement that:
class CategoryViewController: UIViewController {
var checkedValues = [[Bool]]()
var indexSelected = -1
override func viewDidLoad() {
super.viewDidLoad()
// your code here
checkedValues.append(contentsOf: repeatElement([], count: yourCategArray.count))
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// your code here
indexSelected = indexPath.row
self.performSegue(withIdentifier: "yourSegueIdentifierHere", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
(segue.destination as! SubCategoryViewController).parentCategoryVC = self
}
}
Now for the other View Controller:
class SubCategoryViewController: UIViewController {
var parentCategoryVC = CategoryViewController()
override func viewDidLoad() {
super.viewDidLoad()
if parentCategoryVC.checkedValues[parentCategoryVC.indexSelected].count == 0 {
parentCategoryVC.checkedValues[parentCategoryVC.indexSelected].append(contentsOf: repeatElement(false, count: yourSubCategArray.count))
}
// your code here
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return yourSubCategArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell...
if parentCategoryVC.checkedValues[parentCategoryVC.indexSelected][indexPath.row] { cell.accessoryType = .checkmark } else { cell.accessoryType = .none }
// your code here
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// your code
parentCategoryVC.checkedValues[parentCategoryVC.indexSelected][indexPath.row] = !parentCategoryVC.checkedValues[parentCategoryVC.indexSelected][indexPath.row]
tableView.reloadRows(at: indexPath, with: UITableViewRowAnimation.none)
}
}
For any additional clarification feel free to ask

Answer 2

You need to create one Int type array and then append value on click if not in array and if already exist so you need to remove from array and set checkmark in cellForRowAt method.
Please See complete code
import UIKit
class testViewController: UIViewController {
var selectedRows: [Int] = []
override func viewDidLoad() {
super.viewDidLoad()
}
}
extension testViewController: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 10
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell")!
cell.textLabel?.text = "Welcome " + (indexPath.row+1).description
cell.selectionStyle = .none
cell.accessoryType = selectedRows.contains(indexPath.row) ? .checkmark : .none
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 50
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
if self.selectedRows.contains(indexPath.row) {
if let index = self.selectedRows.firstIndex(of: indexPath.row) {
self.selectedRows.remove(at: index)
}
} else {
self.selectedRows.append(indexPath.row)
}
tableView.reloadData()
}
}