Detect last cell in full page UICell UICollectionView - ios

Question

I have a checkout flow using a UICollectionViewController and a full page UICell. After the last cell(the last item) is displayed I want to add a summary page of all the items that have been added to the shopping cart along with a total price. I tried to check if the last item = itemsArray.count - 1 however it keeps printing "last item" in the cell before last. Also in the last cell, it prints "not last".
class CollectionViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout, PostCellDelegate {
var totalPrice = Float()
private var hiddenRows = Set<Int>()
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! PostCell
cell.finalLabel.text = String(totalPrice)
cell.delegate = self
let item = itemsArr[indexPath.row]
cell.set(name: item.name, brand: item.brand, price: item.price)
if indexPath.row == itemsArr.count - 1 {
print("last item")
}else {
print("not last")
}
if hiddenRows.contains(indexPath.row) {
cell.myButton.isHidden = true
cell.removeButton.isHidden = false
}else{
cell.removeButton.isHidden = true
cell.myButton.isHidden = false
}
cell.finalLabel.text = String(totalPrice)
return cell
}
#objc func addTapped(cell: PostCell) {
guard let indexPath = self.collectionView.indexPath(for: cell) else {return}
hiddenRows.insert(indexPath.row)
cell.removeButton.isHidden = false
let item = itemsArr[indexPath.row]
print(item.price)
totalPrice += Float(item.price) ?? 0
cell.finalLabel.text = String(totalPrice)
}
#objc func removeButtonTapped(cell: PostCell) {
guard let indexPath = self.collectionView.indexPath(for: cell) else {return}
hiddenRows.insert(indexPath.row)
cell.myButton.isHidden = false
let item = itemsArr[indexPath.row]
totalPrice -= Float(item.price) ?? 0
cell.finalLabel.text = String(totalPrice)
}
}
protocol PostCellDelegate {
func removeButtonTapped(cell: PostCell)
func addTapped(cell: PostCell)
func didPressButton(_ tag: Int)
}
class PostCell: UICollectionViewCell {
var delegate: PostCellDelegate?
func set(name: String, brand: String, price: String){
nameLabel.text = name
brandLabel.text = brand
priceLabel.text = price
}
override init(frame: CGRect) {
super.init(frame: frame)
self.myButton.addTarget(self, action: #selector(addButtonTapped(sender:)), for: .touchUpInside)
self.removeButton.addTarget(self, action: #selector(subButtonTapped(sender:)), for: .touchUpInside)
setupCellConstraints()
}
#objc func buttonPressed(_ sender: UIButton) {
delegate?.didPressButton(sender.tag)
}
#objc func addButtonTapped(sender: UIButton){
self.delegate?.addTapped(cell: self)
sender.isHidden = true
}
#objc func subButtonTapped(sender: UIButton){
self.delegate?.removeButtonTapped(cell: self)
sender.isHidden = true
}
}