CollectionView sizeForItemAtIndexPath never called

Question

This is driving me crazy! I have a UICollectionViewController as shown below:

class PhrasesCompactCollectionViewController: UICollectionViewController
         


        

Answer 1

Swift 5

All these steps are required :

1. Conform to UICollectionViewDelegateFlowLayout <== Absolutely needed !!
2. and to UICollectionViewDelegate, UICollectionViewDataSource
3. Set these in viewDidLoad : collectionView.delegate = self and collectionView.dataSource = self
4. Set Estimate Size to None in the Interface Builder
5. Make sure the following method has sizeForItemAt and not sizeForItemAtIndexPath

as :

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
{
    return CGSize(width: 100, height:100)
}