ios - UICollectionView deleteItemsAtIndexPaths 失败

Question

- (void)deleteCell 
{
        [self.collectionViewMenu performBatchUpdates:^{

           [self.itemsArray removeObjectAtIndex:1];
           NSIndexPath *indexPath = [NSIndexPath indexPathForRow:1 inSection:0];
           [self.collectionViewMenu deleteItemsAtIndexPaths:@[indexPath]];

    } completion:^(BOOL finished) {  }];
}

请帮忙解决这个问题，我做错了什么？尝试删除 collectionView 中的项目后出现此错误。

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** setObjectForKey: object cannot be nil (key: <_UICollectionViewItemKey: 0x8d705e0> Type = SV Kind = UICollectionElementKindSectionHeader IndexPath = <NSIndexPath: 0x8d6f4b0> {length = 2, path = 0 - 0})'

Answer 1

我通过删除页眉和页脚大小代表解决了这个问题。问题在于我没有返回页眉或页脚。

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section;
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section;