how to save indexpaths temporarily in swift 3? - ios

Question

In filter selection view controller i will select the brands and then when i press apply it will pop to another screen and if the user to come back again to same page the previously selected should have check mark and that should save temporarily until the user leaves from filter page to list page
func downloadJsonWithURL() {
let url = URL(string: urlString)!
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil { print(error!); return }
do {
if let jsonObj = try JSONSerialization.jsonObject(with: data!) as? [[String:Any]] {
self.products = jsonObj.map{ Product(dict: $0) }
DispatchQueue.main.async {
self.tableDetails.reloadData()
}
}
} catch {
print(error)
}
}
task.resume()
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "filterSelectionCell", for: indexPath) as! FilterSelectionCell
activityIndicator.stopAnimating()
activityIndicator.hidesWhenStopped = true
tableDetails.isHidden = false
let product = products[indexPath.row]
cell.brandProductName.text = product.name
cell.accessoryType = product.selected ? .checkmark : .none
if namesArray.count != 0 {
for name in namesArray{
if product.name.contains(name){
print(product.name)
cell.accessoryType = .checkmark
}
else {
cell.accessoryType = .none
}
}
}
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let selected = products[indexPath.row].selected
products[indexPath.row].selected = !selected
tableView.reloadRows(at: [indexPath], with: .none)
let selectedItems = products.filter{ $0.selected }
let selectedNames = products.filter{ $0.selected }.map{ $0.name }
let cell = tableView.cellForRow(at: indexPath)
selectedIndexPathArray.append(indexPath as NSIndexPath)
}
struct Product {
let name : String
let value : String
let img : String
let id : Int
var selected = false
init(dict : [String:Any]) {
self.name = dict["name"] as? String ?? ""
self.value = dict["value"] as? String ?? ""
self.img = dict["img"] as? String ?? ""
self.id = dict["id"] as? Int ?? 0
}
}