namespace UIKit
{
    [Model]
    [Protocol]
    [Register("UICollectionViewDelegateFlowLayout", false)]
    public class UICollectionViewDelegateFlowLayout : UICollectionViewDelegate, INativeObject, IDisposable, IUICollectionViewDelegate, IUICollectionViewDelegateFlowLayout, IUIScrollViewDelegate
    {
        [BindingImpl(BindingImplOptions.GeneratedCode | BindingImplOptions.Optimizable)]
        [Export("collectionView:layout:referenceSizeForHeaderInSection:")]
        public virtual CGSize GetReferenceSizeForHeader(UICollectionView! collectionView, UICollectionViewLayout! layout, nint section);
    }
}