ios - 删除项目后 CollectionView 崩溃

Question

我有一个 UICollectionView，它在 UITableViewCell 内水平滚动(附截图)。在collectionView中，第一个添加更多项目的单元格，旁边是俱乐部列表。

//MARK: UICollectionViewDataSource
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    
    return 1 + arrClubs.count
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    if indexPath.item == 0 {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellAdd, for: indexPath) as! FXFiltersAddCollectionViewCell
        
        cell.layoutIfNeeded()
        
        return cell
    } else {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellTeam, for: indexPath) as! FXFiltersTeamCollectionViewCell
        
        let isValidIndex = arrClubs.indices.contains(indexPath.item-1)
        if isValidIndex == true {
            let clubMO = Utils.clubFromId(clubId: arrClubs[indexPath.item-1])
            
            cell.lbName.text = clubMO?.short_name
            cell.imgLogo.setImage(url: clubMO?.icon, placeholder: nil)
        }
        
        cell.delegate = self
        
        cell.layoutIfNeeded()
        
        return cell
    }
}

现在，我通过按“x”按钮删除每个单元格。

func didSelectRemoveClub(cell: FXFiltersTeamCollectionViewCell) {
    if let indexPath = self.collectionView.indexPath(for: cell) {
        self.collectionView.performBatchUpdates({
            let isValidIndex = arrClubs.indices.contains(indexPath.item-1)
            if isValidIndex == true {
                arrClubs.remove(at: (indexPath.item - 1))
                
                self.collectionView.deleteItems(at: [indexPath])
            }
        }, completion: { (finished) in

        })
    }
}

假设，我有 6 个俱乐部单元，我删除第 1、2、3 个俱乐部单元，它工作正常。然后我删除第四个单元格，它崩溃了:

Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndexedSubscript:]: index 3 beyond bounds [0 .. 2]'

但是如果在删除之前，我将 collectionView 滚动到最后一个单元格并返回第一个单元格，则效果很好!

Answer 1

在从数组中删除对象之前尝试以下更新删除集合单元:

func didSelectRemoveClub(cell: FXFiltersTeamCollectionViewCell) {
    if let indexPath = self.collectionView.indexPath(for: cell) {
        self.collectionView.performBatchUpdates({
            let isValidIndex = arrClubs.indices.contains(indexPath.item)
            if isValidIndex == true {

                self.collectionView.deleteItems(at: [indexPath])
                arrClubs.remove(at: (indexPath.item))
            }
        }, completion: { (finished) in

        })
    }
}