reload selected collection cell in independent time interval - ios

Question

I am trying to make countdown timer app with collectionView.
Features & Functions:
Each cell has own label and timer function.
CountDown timer will run if user touches a cell.
Time string have to updated as timer run.
I successfully build a timer in each cell but I'm stuck updating timeLabel (reload selected cell).
Please check the codes below and give me some hint.
class ListViewController: UIViewController {
#IBOutlet weak var collectionView: UICollectionView!
var recipeList: TimeRecipeList
var timer = Timer()
required init?(coder aDecoder: NSCoder) {
recipeList = TimeRecipeList()
super.init(coder: aDecoder)
}
override func viewDidLoad() {
super.viewDidLoad()
let width = (view.frame.size.width - 10) / 2
let layout = collectionView.collectionViewLayout as! UICollectionViewFlowLayout
layout.itemSize = CGSize(width: width, height: width)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "AddItemSegue" {
if let addItemVC = segue.destination as? AddRecipeViewController {
addItemVC.delegate = self
}
}
}
}
extension ListViewController: UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return recipeList.item.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "RecipeListCell", for: indexPath)
let item = recipeList.item[indexPath.row]
configureText(for: cell, with: item)
return cell
}
func configureText(for cell: UICollectionViewCell, with item: TimeRecipe) {
if let label = cell.viewWithTag(1) as? UILabel {
label.text = item.name
}
if let label = cell.viewWithTag(2) as? UILabel {
let formatter = DateComponentsFormatter()
formatter.unitsStyle = .abbreviated
let timeString = formatter.string(from: TimeInterval(item.time))
label.text = timeString
}
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "RecipeListCell", for: indexPath)
let item = recipeList.item[indexPath.row]
let cellTimer = TimerControl()
cellTimer.second = item.time
cellTimer.timerRun()
configureText(for: cell, with: item)
}
class TimerControl {
var timer = Timer()
var second: Int = 0
func timerRun() {
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(countDown), userInfo: nil, repeats: true)
}
#objc func countDown() {
//let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "RecipeListCell", for: indexPath)
if second <= 1 {
timer.invalidate()
} else {
second -= 1
//collectionView.reloadItems(at: [indexPath])
//MARK: Reload selected cell
}
}
}
}
extension ListViewController: AddRecipeViewControllerDelegate {
func addRecipeViewControllerDidCancel(_ controller: AddRecipeViewController) {
dismiss(animated: true)
}
func addRecipeViewControllerDisSave(_ controller: AddRecipeViewController, didFinishAdding item: TimeRecipe) {
dismiss(animated: true)
let rowIndex = recipeList.item.count
recipeList.item.append(item)
let indexPath = IndexPath(row: rowIndex, section: 0)
let indexPaths = [indexPath]
collectionView.insertItems(at: indexPaths)
}
}

Answer 1

#objc func countDown(indexPath: IndexPath) {
if second <= 1 {
timer.invalidate()
} else {
second -= 1
//MARK: Reload selected cell
yourarray[indexPath.row] = newvalues
collectionView.reloadItems(at: [indexPath])
}
}