CollectionView sizeForItemAtIndexPath never called

Question

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

class PhrasesCompactCollectionViewController: UICollectionViewController


        

Answer 1

In Swift 3+ Use this method:

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width:(collectionView.frame.height-90)/2, height: 100)
}

Make sure that your class complies both Delegate

• UICollectionViewDelegate

• UICollectionViewDelegateFlowLayout

Answer 2

For me (in Swift 3.1) the method must be declared public like this:

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

Don't forget to make it public.

Answer 3

my problem was that I had my UICollectionViewDataSource object created as local variable. So if you initialize your dataSource object manually in code, make sure to store it as global variable.