神奇的 collectionview

1. 删除item

 MoreCollectionViewCell * cell = (MoreCollectionViewCell *)button.superview.superview;
    NSIndexPath * index = [self.myCollectionView
indexPathForCell:cell];

    [dataArray
removeObjectAtIndex:index.row];
    
    NSIndexPath *indexPath = [NSIndexPath
indexPathForItem:index.row
inSection:0];
    
    NSArray *itemPaths =
@[indexPath];
    
    
    [self.myCollectionView
deleteItemsAtIndexPaths:itemPaths];