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];