What steps need to be taken to eliminate the image flickering effect when scrolling a table?

The flickering effect of images when scrolling a table (UITableView or UICollectionView) usually occurs due to cell reuse and asynchronous image loading. To fix this issue, you should:

1. Use cell reuse via dequeueReusableCell.
2. When loading images asynchronously, check that the loaded image is set to the cell that is currently visible (for example, by comparing the current index or using tokens).
3. Cache loaded images to avoid reloading them during scrolling.
4. When loading an image into a cell, first reset the old image (for example, set a placeholder) to prevent showing the old image during loading.

Example using SDWebImage:

cell.imageView.sd_setImage(with: URL(string: imageUrl), placeholderImage: UIImage(named: "placeholder"))

If you are writing your own loading method, ensure that after asynchronous loading, the image is set only if the cell has not been reused.