sizeForItemAtIndexPath is not found in different swift versions

Question

I am using UICollectionView but following method not found:

 func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize

please suggest me it's replacement.

Answer 1

For me sizeForItemAt wasn't called because in Swift 3 you need to explicitly set your class to implement the UICollectionViewDelegateFlowLayout protocol