Swift collectionview 插入数据崩溃的问题

collectionview 插入数据崩溃了，代码如下

let selectIndex = self.photoData.seletedAssetArray.index(of: self.previewPhotoArray[currentIndex]) if selectIndex != nil{ self.rightButton.asyncSetImage(UIImage.zyCreateImageWithView(view: ZYPhotoNavigationViewController.zyGetSelectNuberView(index: "(selectIndex! + 1)")), for: .selected) }

        if selectIndex != nil{
            if self.rightButton.isSelected == false {
                let indexPath = IndexPath.init(row: selectIndex!, section: 0)
                self.photoData.seletedAssetArray.remove(at: self.photoData.seletedAssetArray.index(of: self.previewPhotoArray[currentIndex])!)
                thumbnailCollectionView.deleteItems(at: [indexPath])
            }else{
                let indexPath = IndexPath.init(row: selectIndex!, section: 0)
                thumbnailCollectionView.numberOfItems(inSection: 0)
                thumbnailCollectionView.insertItems(at: [indexPath])
                thumbnailCollectionView.reloadItems(at: [indexPath])
                thumbnailCollectionViewCellToggeleSelect(indexPath: indexPath)
            }
        }

报错信息： 'Invalid update: invalid number of items in section 0. The number of items contained in an existing section after the update (1) must be equal to the number of items contained in that section before the update (1), plus or minus the number of items inserted or deleted from that section (1 inserted, 0 deleted) and plus or minus the number of items moved into or out of that section (0 moved in, 0 moved out).'

网上查了一下，https://stackoverflow.com/questions/19199985/invalid-update-invalid-number-of-items-on-uicollectionview，用了第二个高票答案，但没有用。 第一个高票答案没看懂，大神指点一下，不知道有没有其它方法