删除tableview时出现EXC_BAD_INSTRUCTION错误

Question

我的tableview目前看起来像这样。

这里是cellForRowAtIndexPath的代码

f64.const

}

如您所见，费用按日期分组。当我删除顶部的费用时，我希望接下来的费用来接管并显示datelabel。这是顶部的标签，显示日期，对于某个特定日期已经存在的费用是不可见的。但是，当我删除费用时，我会在此行收到一个EXC_BAD_INSTRUCTION：

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "monthlyCell", for: indexPath) as! MonthlyExpenseTableViewCell

    tableView.rowHeight = UITableViewAutomaticDimension
    tableView.estimatedRowHeight = 64

    let expense = expensePerMonth[indexPath.row]

    let date = expense.modificationDate
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "EEEE d MMMM"
    let dateString = dateFormatter.string(from: date! as Date).uppercased()

    CoreDataHelper.save()

    if indexPath.row == 0{
        newMode = true
    }
    if indexPath.row>=1{
        monthlyExpenses.sorted(by: { $0.modificationDate as! Date > $1.modificationDate as! Date})
      let previousExpensesData = monthlyExpenses[indexPath.row - 1].modificationDate
        let day = Calendar.current.component(.day, from: monthlyExpenses[indexPath.row].modificationDate as! Date) // Do not add above 'date' value here, you might get some garbage value. I know the code is redundant. You can adjust that.
        let previousDay = Calendar.current.component(.day, from: monthlyExpenses[indexPath.row - 1].modificationDate! as Date)
        if day == previousDay {
            newMode = false
        } else {
            newMode = true
        }
    }


    var expenseAmountCalculating:Double = Double(expense.amount!)!
    var expenseAmountDisplayed:String = convertToMoney(expenseAmountCalculating)

    var finalDisplayed:String = expense.currencySymbol! + " " + expenseAmountDisplayed
    cell.dateLabel.text = dateString
    cell.expenseName2.text = expense.name
    cell.expenseAmount2.text = finalDisplayed
    cell.expenseCategory2.text = expense.category
    cell.expenseCollection2.text = expense.collection
                if (expense.expense) {
                    cell.expenseAmount2.textColor = UIColor.red
                }


                else if (expense.income){
                    cell.expenseAmount2.textColor = UIColor(red:0.49, green:0.83, blue:0.13, alpha:1.0)
                }

                if (expense.cash) && (expense.expense){
                    cell.cashOrCredit.image = #imageLiteral(resourceName: "Cash-Expense Icon")

                }
                else if (expense.cash) && (expense.income){
                    cell.cashOrCredit.image = #imageLiteral(resourceName: "Cash-Income Icon")

                }
                else if (expense.credit) && (expense.income){
                    cell.cashOrCredit.image = #imageLiteral(resourceName: "Credit-Income Icon")

                }
                else if (expense.credit) && (expense.income){
                    cell.cashOrCredit.image = #imageLiteral(resourceName: "Credit-Expense Icon")

                }
    if newMode == false{
        cell.dateLabel.isHidden = true
        tableView.rowHeight = 64
        cell.expenseName2.frame.origin = CGPoint(x: 60, y: 11)
        cell.expenseCategory2.frame.origin = CGPoint(x: 61, y: 33)
        cell.expenseCollection2.frame.origin = CGPoint(x: 108, y: 33)


    }
    else if newMode == true{
        tableView.estimatedRowHeight = 64

    }
return cell

可能是因为日期标签对于单元格是不可见的。

那我该怎么做呢？

删除单元格的代码是：

    let dateString = dateFormatter.string(from: date! as Date).uppercased()