正如我发现的那样,我无法通过nil来隐藏其他部分中的页脚视图,因为它会导致崩溃.

override func collectionView(collectionView: UICollectionView,viewForSupplementaryElementOfKind kind: String,atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView {

        var v : UICollectionReusableView! = nil
        if kind == UICollectionElementKindSectionHeader {
            let x = collectionView.dequeueReusableSupplementaryViewOfKind(UICollectionElementKindSectionHeader,withReuseIdentifier:reuseHeaderIdentifier,forIndexPath:indexPath) as HouseNameReusableView

            let h = houses[indexPath.section]        
            x.nameLabel.text = h["name"] as? String

            return x

        }else if kind == UICollectionElementKindSectionFooter {
            if indexPath.section == houses.count - 1{
            let x = collectionView.dequeueReusableSupplementaryViewOfKind(UICollectionElementKindSectionFooter,withReuseIdentifier:reuseFooterIdentifier,forIndexPath:indexPath) as FooterCollectionReusableView

            return x
            }
        }
        return v
    }