Gifreakius Gifreakius - 5 months ago 17
iOS Question

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

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

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

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