How to change UICollectionViewCell size programmatically in Swift?

Question

I have a UICollectionView with a segmented control to switch between data. But how do I change the UICollectionViewCell size propertie

Answer 1

if you use Gaurav Rami's code bellow

let cellSize = CGSize(width:80 , height:80)

let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .vertical //.horizontal
layout.itemSize = cellSize
layout.sectionInset = UIEdgeInsets(top: 1, left: 1, bottom: 1, right: 1)
layout.minimumLineSpacing = 1.0
layout.minimumInteritemSpacing = 1.0
myCollectionView.setCollectionViewLayout(layout, animated: true)

and get this message "Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates." you should remove animated when setting view layout for collection view

myCollectionView.setCollectionViewLayout(layout, animated: false)

then the message will disappear