UICollectionView not showing selected data after long scroll - ios

Question

I have one UICollectionView with five custom cells that need to be render on specific conditions, cells are getting generated. Now problem I am going through is consider I have selected one cell at specific index, and now I scroll downwards and now again I long scroll. When UICollectionView stops scrolling, if the index is the same as which we selected, UICollectionView doesn't show that cell as selected. But now if I even try to move the cell a little bit, even a bit, UICollectionView shows that cell as selected cell.
Following is my code, that I have wrote in prefetchItem:
(cell as? PATemplateTypeOneCollectionCell)?.fillCellData(row: indexPath.row,section:indexPath.section, paCategoryQuestions: currentIndexQuestion, paQuestionCollection: currentIndexCollection)
cell!.alpha = 0.4
if self.multipleIndexPathsArray[indexPath.section][0] != []{
collectionView.selectItem(at: self.multipleIndexPathsArray[indexPath.section][0], animated: true, scrollPosition: .right)
}
else{
print("self.multipleIndexPathsArray[indexPath.section][0] is empty")
}
UICollectionViewCell:
override var isSelected: Bool {
didSet {
if isSelected {
self.alpha = 1.0
self.layer.borderWidth = 2.0
self.layer.borderColor = ColorConstants.colorFromHexString(hexString: paCategoryQuestions.selection_color).cgColor
}else {
self.alpha = 0.4
self.layer.borderWidth = 1.0
self.layer.borderColor = UIColor.lightGray.cgColor
}
}
Kindly request you guys to help with this issue.

Answer 1

So after hours of thinking I came across one solution. So as my cellForItem was not rendering selected scroll properly after long scroll, what I tried is recognizing UIScrollView's delegate scrollViewDidEndDecelerating. And recognizing if currently visible indexPath cells were selected previously or not by using my saved values array. Following is the code that worked for me:
fileprivate func checkIfCellIsSelected(){
for eachCell in afterPaymentPACollectionView.visibleCells{
let indexPath = afterPaymentPACollectionView.indexPath(for: eachCell)
for eachIndexSelected in multipleIndexPathsArray{
if eachIndexSelected.contains(indexPath!){
afterPaymentPACollectionView.selectItem(at: indexPath, animated: true, scrollPosition: .right)
}
}
}
}
//MARK: UIScrollViewDelegate
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
checkIfCellIsSelected()
}