Sobes.tech
Junior — Middle

How would you fix the problem of table scrolling getting stuck?

sobes.tech AI

Answer from AI

The issue of scrolling stutter in iOS table views is often related to improper cell redraw management or gesture conflicts.

Possible solutions:

  • Optimize cell reuse: ensure cells are properly reused via dequeueReusableCell to avoid creating unnecessary objects.

  • Avoid heavy operations in cellForRowAt: for example, image loading should be asynchronous.

  • Use prefetching (UITableViewDataSourcePrefetching) for preloading data.

  • Check scrollView settings: ensure there are no conflicts with other gestures or nested scroll views.

  • Disable gesture delays (delaysContentTouches) or configure canCancelContentTouches if it affects responsiveness.

Example of asynchronous image loading in a cell:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
    let url = URL(string: imageUrls[indexPath.row])!
    DispatchQueue.global().async {
        if let data = try? Data(contentsOf: url), let image = UIImage(data: data) {
            DispatchQueue.main.async {
                if let updateCell = tableView.cellForRow(at: indexPath) {
                    updateCell.imageView?.image = image
                    updateCell.setNeedsLayout()
                }
            }
        }
    }
    return cell
}