UICollectionViewLayout Not Resizing UIImageViews Within Cells

Question

My collectionview images are not getting resized. I'm using the following in the viewcontroller that contains the collectionview, and it sizes correctly when the cells are empty; however with an imageview inside it doesn't behave properly.

Thanks!

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

    let noOfCellsInRow = 2
    let flowLayout = collectionViewLayout as! UICollectionViewFlowLayout
    let totalSpace = flowLayout.sectionInset.left
        + flowLayout.sectionInset.right
        + (flowLayout.minimumInteritemSpacing * CGFloat(noOfCellsInRow - 1))
    let size = Int((collectionView.bounds.width - totalSpace) / CGFloat(noOfCellsInRow))
    return CGSize(width: size, height: size)

}

Toto · Accepted Answer · 2020-03-18T16:27:25.640

0

Add this to your ViewController

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    collectionView.collectionViewLayout.invalidateLayout()
}

And in Storyboard check if the collection view - Estimate Size is set to None in Size Inspector

edited Mar 18 '20 at 16:27

answered Mar 18 '20 at 16:08

Toto

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Tried; didn't seem to change the issue. – moosgrn Mar 18 '20 at 16:16
1

In storyboard check if the collection view - `Estimate Size` is set to `None` in Size Inspector – Toto Mar 18 '20 at 16:22
That was it; thank you! Why did that change things? – moosgrn Mar 18 '20 at 16:24
@moosgrn happy to help, unfortunately I don't have the explication for this – Toto Mar 18 '20 at 16:26
For what it's worth I don't know if the .invalidateLayout() did much, but the Estimate Size definitely did. Thanks! – moosgrn Mar 18 '20 at 16:29

UICollectionViewLayout Not Resizing UIImageViews Within Cells

1 Answers1