Slow loading of images in a collection view, swift

Question

I have a few (20 - 30) images stored the app and on loading them on to a collection view, they start off small as shown in the screen shot and on scrolling they become the normal size.

Any ideas on how to fix this? Quite confused on why!

Here is my code for the cellForItemAtIndexPath:

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

        let cellSelected = iconCollectionView.dequeueReusableCellWithReuseIdentifier("IconCell", forIndexPath: indexPath) as! IconCollectionViewCell

        cellSelected.workoutImage.image = iconsArray[indexPath.item].exerciseIcon

        cellSelected.layer.shouldRasterize = true
        cellSelected.layer.rasterizationScale = UIScreen.mainScreen().scale;

        return cellSelected
    }

Have you set constraint of image properly ? also need to set UIImage content mode to AspectFit — rushisangani, Jan 22 '16 at 11:19
@Gugulethu Turning OFF self.layer.shouldRasterize increases performance to normal levels. — Mayank Patel, Jan 22 '16 at 11:38
@MayankPatel Thanks. I have done that. :). Unfortunately I know it's not the solution to the problem. — Gugulethu, Jan 22 '16 at 11:40
Before return line put this line: cellSelected.setNeedsDisplay() — Krešimir Prcela, Jan 22 '16 at 12:46

score 1 · Accepted Answer · edited Jun 14 '17 at 11:42

1

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {



    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as? CollectionViewCell
    cell?.imageth.image = UIImage(named: (arrayName[indexPath.row] as? String)!)
    return cell!

edited Jun 14 '17 at 11:42

Shamas S

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answered Jun 14 '17 at 11:37

anonymous

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Slow loading of images in a collection view, swift

1 Answers1