我有以下类(class):classCSSectionHeader:UICollectionReusableView{@IBOutletvartextLabel:UILabel!}然后我尝试将其转换为如下所示:overridefunccollectionView(collectionView:UICollectionView,viewForSupplementaryElementOfKindkind:String,atIndexPathindexPath:NSIndexPath)->UICollectionReusableView{letcell1=UICollectionReusab