如何实例化一个collectionview 的cell？

Question

letcell=collectionView.dequeueReusableCellWithReuseIdentifier("BigRoomVideoCell",forIndexPath:indexPath)asVideoViewCell
上面是重用cell的写法，但是如何每次都实例化一个collectionview的cell？
我尝试过letcell=VideoViewCell()
直接报
***Terminatingappduetouncaughtexception'NSInternalInconsistencyException',reason:'thecellreturnedfrom-collectionView:cellForItemAtIndexPath:doesnothaveareuseIdentifier-cellsmustberetrievedbycalling-dequeueReusableCellWithReuseIdentifier:forIndexPath:
google了也没找到合适的答案

Answer 1

也试过letcell=collectionView.cellForItemAtIndexPath(indexPath)asVideoViewCell办法，直接报fatalerror:unexpectedlyfoundnilwhileunwrappinganOptionalvalue

Answer 2

是否没有注册[_collectionViewregisterClass:[BigRoomVideoCellclass]forCellWithReuseIdentifier:CELL_IDENTIFIER];