Allow A Header View for Only Certain Sections Using an iOS UICollectionView

Question

The code below displays my header view correctly, but for each of the sections in the UICollectionView:

-(UICollectionReusableView *)collectionView:(UICollectionView *)collectionView
          viewForSupplementaryElementOfKind:(NSString *)kind
                                atIndexPath:(NSIndexPath *)indexPath {
    UICollectionReusableView * headerView =
        [collectionView 
            dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader 
                               withReuseIdentifier:@"SectionHeaderCollectionReusableView"
                                      forIndexPath:indexPath];
    switch (indexPath.section) {
        case Section_One:
            return headerView;
        case Section_Two:
            return headerView;
        case Section_Three:
            return headerView;
        case Section_Four:
            return headerView;
        case Section_Five:
            return headerView;

        default:
            return headerView;
    }
}

What I would like to do instead, is not display a header view for 'Section_One' or 'Section_Two', but returning 'nil' results in an 'NSInternalInconsistencyException':

-(UICollectionReusableView *)collectionView:(UICollectionView *)collectionView
          viewForSupplementaryElementOfKind:(NSString *)kind
                                atIndexPath:(NSIndexPath *)indexPath {
    UICollectionReusableView * headerView =
        [collectionView 
            dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader 
                               withReuseIdentifier:@"SectionHeaderCollectionReusableView"
                                      forIndexPath:indexPath];
    switch (indexPath.section) {
        case Section_One:
            return nil;
        case Section_Two:
            return nil;
        case Section_Three:
            return headerView;
        case Section_Four:
            return headerView;
        case Section_Five:
            return headerView;

        default:
            return nil;
    }
}

What do I need to do to display a header view for only certain sections?

Answer 1

Go ahead and return a header for each section and then set the size of the section header to have a size of zero in this UICollectionViewDelegate function.

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section
{
    if (section == 0) {
        return CGSizeZero;
    }else {
        return CGSizeMake(self.collectionView.bounds.size.width, desiredHeight);
    }
}