How do I define the size of a CollectionView on rotate

Question

I have a viewcontroller with 2 CollectionView Controllers.

I would like on rotation that only one of the collection views resize to a custom size while the other re

Answer 1

The question was , how to separate two collection views in sizeForItemAtIndexPath. Why just not something like this?

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

    if collectionView == firstCollectionView{

            return CGSize(width: self.frame.width/3, height: 40)
       }


    else if collectionView == secondCollectionView{

        return CGSize(width: self.frame.width, height: self.frame.height-2)
    }

    abort()
}