//在创建collectionView的时候注册cell（一个分区）

UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@“cell" forIndexPath:indexPath];

  for (UIView *view in cell.contentView.subviews) {

    [view removeFromSuperview];

  }

//在cellForItem方法中注册cell（多个分区）

 NSString *identifier=[NSString stringWithFormat:@"%ld%ld",(long)indexPath.section,(long)indexPath.row];

  

  [collect registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:identifier];

  

  UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];

  

  for(id subView in cell.contentView.subviews){

    

    if(subView){

      

      [subView removeFromSuperview];

    }

    

  }