How to avoid refresh in uitableview

Question

I have an UITableView that loads cells that have heavy images and other animations, it works fine but it looks slow since when scrolling up or down it is renamed cellForRowAt what it does reloads images and animations Is there a way to avoid this if those cells had already been loaded before?

Possible duplicate of [How to cache images using URLSession in Swift](https://stackoverflow.com/questions/40873685/how-to-cache-images-using-urlsession-in-swift) — Gustavo Vollbrecht, Aug 29 '19 at 02:33
Are you downloading the image and then showing it in your table or having raw image in assets ? — Abhishek, Aug 29 '19 at 06:23

score 0 · Answer 1 · answered Aug 29 '19 at 09:42

Just move your animation logic to willDisplayCell delegate and for animating only for the first time I've handled using a flag.

Code Sample:

let popularLinks = ["One","Two","Three","Four","Five"]
var isAnimated = false

 func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {

        var lastInitialDisplayableCell = false

        if popularLinks.count > 0 && !isAnimated {
            if let indexPathsForVisibleRows = tableView.indexPathsForVisibleRows,
                let lastIndexPath = indexPathsForVisibleRows.last, lastIndexPath.row == indexPath.row {
                lastInitialDisplayableCell = true
            }
        }

        if !isAnimated {

            if lastInitialDisplayableCell {
                isAnimated = true
            }

            cell.transform = CGAffineTransform(translationX: 0, y: cell.bounds.height/2)
            cell.alpha = 0

            UIView.animate(withDuration: 0.5, delay: 0.05*Double(indexPath.row), options: [.curveEaseInOut], animations: {
                cell.transform = CGAffineTransform(translationX: 0, y: 0)
                cell.alpha = 1
            }, completion: nil)
        }
    }

How to avoid refresh in uitableview

1 Answers1