Question

我对我的项目有一个真正的噩梦，我需要将单元格内容保存到一个对象，对于数组中的每个对象。我无法通过循环遍历数组对象的表格单元格并尝试将它们全部匹配来实现此功能。

所以我的下一个想法是将didFinishEditing相关函数添加到cellForRowAt函数中？

我不确定这也会奏效，但这就是我所拥有的：

这里的每一行都有一个标签，一个可以滚动到一个数字的代表的选择器，一个用于放置重量的文本字段。然后我将每行保存为存储集合，代表和权重的对象。

问题是在编辑时，如何再次保存这些以覆盖旧值？因此我上面的计划是使用didFinishEditing方法。

我之前的计划是下面的代码，但我无法弄清楚注释部分。所以我希望有人能够指导我在编辑时如何处理，而不是这个不起作用的保存按钮功能！

    func saveUserExerciseSets() {

    if userExercise == nil {
        print("CREATING A FRESH SET OF SETS FOR THE NEW EXERCISE")
        for cell in self.customSetsTable.visibleCells as! Array<NewExerciseTableViewCell> {
            print("SAVING THESE CELLS \(customSetsTable.visibleCells)")
            let newUserExerciseSet = UserExerciseSet(context: self.managedObjectContext)

            newUserExerciseSet.setPosition = Int64(cell.setNumber.text!)!
            newUserExerciseSet.setReps = Int64(cell.repsPicker.selectedRow(inComponent: 0))
            newUserExerciseSet.parentExerciseName = self.userExerciseName.text

            if self.localeIdentifier == "en_GB" {
                let kgWeight = Measurement(value: Double(cell.userExerciseWeight.text!)!, unit: UnitMass.kilograms)
                newUserExerciseSet.setWeight = kgWeight as NSObject?
                newUserExerciseSet.initialMetricSystem = self.localeIdentifier

            } else if self.localeIdentifier == "en_US" {
                let lbsWeight = Measurement(value: Double(cell.userExerciseWeight.text!)!, unit: UnitMass.pounds)
                newUserExerciseSet.setWeight = lbsWeight as NSObject?
                newUserExerciseSet.initialMetricSystem = self.localeIdentifier
            }

            let fetchRequest: NSFetchRequest<UserExercise> = UserExercise.fetchRequest()
            fetchRequest.predicate = NSPredicate(format: "name == %@", self.exerciseNameToAddTo!)

            do {
                let parentExercise = try self.managedObjectContext.fetch(fetchRequest).first
                parentExercise?.addToExercisesets(newUserExerciseSet)
                print("SET ADDED TO EXERCISE")
            } catch {
                print("Fetching Routine Failed")
            }
        }

    } else if self.userExercise != nil {
        print("UPDATING EXISTING SETS FOR THE EXISTING EXERCISE")

        let cells = self.customSetsTable.visibleCells as! Array<NewExerciseTableViewCell>

        for cell in cells {
            let exerciseSets = self.userExercise?.exercisesets?.allObjects as! [UserExerciseSet]
            let sortedexerciseSets = exerciseSets.sorted { ($0.setPosition < $1.setPosition) }
            let cellsSet = sortedexerciseSets //match the sortedexerciseSets set object to the cell index positions

            cellsSet.setPosition = Int64(setsCell.setNumber.text!)!
            cellsSet.setReps = Int64(setsCell.repsPicker.selectedRow(inComponent: 0))

            if self.localeIdentifier == "en_GB" {
                let kgWeight = Measurement(value: Double(cell.userExerciseWeight.text!)!, unit: UnitMass.kilograms)
                cellsSet.setWeight = kgWeight as NSObject?
            } else if self.localeIdentifier == "en_US" {
                let lbsWeight = Measurement(value: Double(cell.userExerciseWeight.text!)!, unit: UnitMass.pounds)
                cellsSet.setWeight = lbsWeight as NSObject?
            }
            cellsSet.parentExerciseName = self.userExerciseName.text
        }
    }

    do {
        try self.managedObjectContext.save()
        print("THE SET HAS BEEN SAVED")
    } catch {
        fatalError("Failure to save context: \(error)")
    }
    delegate?.didFinishEditing()
    self.dismiss(animated: true, completion: nil)
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    guard let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as? NewExerciseTableViewCell
        else {
            fatalError("Unexpected Index Path")
    }

    cell.backgroundColor = UIColor.customBackgroundGraphite()
    cell.textLabel?.textColor = UIColor.white
    cell.repsPicker.dataSource = self
    cell.repsPicker.delegate = self
    configure(cell, at: indexPath)
    return cell
}

func configure(_ cell: NewExerciseTableViewCell, at indexPath: IndexPath) {

    // configuring cells when theres a loaded exercise causes the issues --------------------
    if self.userExercise != nil {
        print("RESTORING CELLS FOR THE EXISTING EXERCISE")
        let unsortedExerciseSets = self.userExercise?.exercisesets?.allObjects as! [UserExerciseSet]
        let exerciseSets = unsortedExerciseSets.sorted { ($0.setPosition < $1.setPosition) }

        let cellsSet = exerciseSets[indexPath.row]

        cell.setNumber.text = String((indexPath.row) + 1)

        let indexRow = Int(cellsSet.setReps)
        print("INDEX ROW INT IS \(indexRow)")

        cell.repsPicker.selectRow(indexRow, inComponent: 0, animated: true) //fix this crashing issue!

        let localeIdentifier = Locale(identifier: UserDefaults.standard.object(forKey: "locale") as! String)
        let setWeight = cellsSet.setWeight as! Measurement<UnitMass>
        let formatter = MassFormatter()
        formatter.numberFormatter.locale = localeIdentifier
        formatter.numberFormatter.maximumFractionDigits = 2

        if localeIdentifier.usesMetricSystem {
            let kgWeight = setWeight.converted(to: .kilograms)
            let finalKgWeight = formatter.string(fromValue: kgWeight.value, unit: .kilogram)
            let NumericKgResult = finalKgWeight.trimmingCharacters(in: CharacterSet(charactersIn: "0123456789.").inverted)
            cell.userExerciseWeight.text = NumericKgResult
        } else {
            let lbsWeight = setWeight.converted(to: .pounds)
            let finalLbWeight = formatter.string(fromValue: lbsWeight.value, unit: .pound)
            let NumericLbResult = finalLbWeight.trimmingCharacters(in: CharacterSet(charactersIn: "0123456789.").inverted)
            cell.userExerciseWeight.text = NumericLbResult
        }

    } else if self.userExercise == nil {
        print("NEW SET CELL ADDED FOR FRESH EXERCISE")
        cell.setNumber.text = String((indexPath.row) + 1)
    }
}

Answer 1

尝试这样的方法来正确匹配setIds。这就是我认为问题所在。

for x in sortedexerciseSets {

     if x.setPosition == Int64(setsCell.setNumber.text!)! {

       //save 
      }           
}

Answer 2

正确的方法是拥有这些集合的数组（我猜，因为你标记了核心数据，它们是NSManagedObject的实例？）。当用户在单元格中进行任何更改（在文本字段中写入新值或滚动到代表的另一个值）时，您需要立即更新阵列中的approproate对象。然后，当您确定要保存更改时，可以在NSManagedObjectContext上调用save，或者只是在上下文上调用rollback来取消所有更改。

编辑完成后，自动将单元格中的更改保存到对象？

2 个答案: