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

first Conform protocol the UICollectionViewDelegateFlowLayout

set width and height  UICollectionViewCell 

UIcollectionViewCell Hight = 300;
UIcollectionViewCell Width = 380;

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout,sizeForItemAt indexPath: IndexPath) -> CGSize {
      return CGSize(width: CGFloat((380)), height: CGFloat(300))
    }