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

Swift 3

Methods from @sumit-oberoi answer won't be called if you are using Swift 3. To make it work make this adjustments:

1. Conform to the UICollectionViewDelegateFlowLayout protocol.

2. Implement these methods:

   func collectionView(_ collectionView: UICollectionView,
                       layout collectionViewLayout: UICollectionViewLayout,
                       sizeForItemAt indexPath: IndexPath) -> CGSize {
   
   }
   
   func collectionView(_ collectionView: UICollectionView,
                       layout collectionViewLayout: UICollectionViewLayout,
                       minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
       return 1.0
   }
   
   func collectionView(_ collectionView: UICollectionView, layout
       collectionViewLayout: UICollectionViewLayout,
                       minimumLineSpacingForSectionAt section: Int) -> CGFloat {
       return 1.0
   }
   

Notice the changes:

1. add _ before collectionView in the method name
2. NSIndexPath changes to IndexPath