如何通过页脚单元格在表视图中使用委托？

我试图做的是使用Delegate通过CalorieFooter单元中的按钮将数据传递到另一个视图控制器。

我无法成功通过CalorieFooter单元格中的infoButton传递数据以显示卡路里，卡路里和卡路里中的卡路里，卡路里和蛋白质。

我目前在CalorieBreakdownController的所有标签中都得到了“ 0”（如图像的最右边所示）。

我认为这个问题可能是因为我的calculationDelegate在CalorieFooter细胞来完成。而我得到小计的方法是将这些单元分成几部分。我对如何从页脚将数据传递到CalorieBreakdownController以获得标签中的“小计”感到困惑。

我如何能够从卡路里卡路里单元格传递CalorieBreakdownController的“ subTotal”数据（如下图所示）

在此先感谢您提供的任何帮助

 import UIKit

 class CalorieViewController: UIViewController {

    var selectedFood: FoodList!
    var additionalCalories: DailyCalories!                  // delegate code for footer

    var calorieItems: [DailyCalories] = []
    var groupedCalorieItems: [String: [DailyCalories]] = [:]
    var dateSectionTitle: [DailyCalories] = []

    @IBOutlet weak var calorieTableView: UITableView!

    override func viewDidLoad() {
        super.viewDidLoad()

        groupedFoodItems = Dictionary(grouping: calorieItems, by: {$0.foodList.day})
        dateSectionTitle = groupedCalorieItems.map{$0.key}.sorted()

    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
         if let vc = segue.destination as? CalorieTotalController {   // delegate code for footer
            vc.additionalCalories = self.additionalCalories
        }
    }
}

extension CalorieViewController: UITableViewDelegate, UITableViewDataSource {

    func numberOfSections(in tableView: UITableView) -> Int {
        return dateSectionTitle.count
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        let date = dateSectionTitle[section]
        return groupedCalorieItems[date]!.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let calorieCell = tableView.dequeueReusableCell(withIdentifier: "CalorieCell") as! CalorieCell

        let date = dateSectionTitle[indexPath.section]
        let calorieItemsToDisplay = groupedCalorieItems[date]![indexPath.row]
        calorieCell.configure(withCartItems: calorieItemsToDisplay.foodList)

        return calorieCell
    }

    func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        let calorieHeader = tableView.dequeueReusableCell(withIdentifier: "CalorieHeader") as! CalorieHeader

        let headerTitle = dateSectionTitle[section]
        calorieHeader.dateLbl.text = "Date: \(headerTitle)"

        return calorieHeader
    }

    func tableView(_ tableView: UITableView, viewForFooterInSection section: Int) -> UIView? {
        let calorieFooter = tableView.dequeueReusableCell(withIdentifier: "CalorieFooter") as! CalorieFooter

        let date = dateSectionTitle[section]
        let arrAllItems = groupedCalorieItems[dispensary]!
        var subtotal: Float = 0
        for item in arrAllItems {
            if item.foodList.selectedOption == 1 {
                 subtotal = subtotal + (Float(item.foodList.calorie1) * Float(item.foodList.count))
            } else if item.foodList.selectedOption == 2 {
                 subtotal = subtotal + (Float(item.foodList.calorie2) * Float(item.foodList.count))
            } else if item.foodList.selectedOption == 3 {
                 subtotal = subtotal + (Float(item.foodList.calorie3) * Float(item.foodList.count))
            }
        }

        calorieFooter.cartTotal.text = "\(subtotal)"
        calorieFooter.calculationDelegate = self                  // delegate code for footer
        calorieFooter.additionalCalories! = ???                   // can't get the right code set to allow the data to pass
        calorieFooter.calculations! = ???                         // can't get the right code set to allow the data to pass
        return calorieFooter
    }  
}

extension CalorieViewController: CalculationDelegate {     // delegate code for footer
    func onTouchInfoButton(from cell: CalorieFooter) {
        self.additionalCalories = cell.additionalCalories
        self.performSegue(withIdentifier: "CalculateDailyCalorieCell", sender: self)
    }
}

import UIKit

protocol CalculationDelegate: class {                     // delegate code for footer
    func onTouchInfoButton(from cell: CalorieFooter)
}

class CalorieFooter: UITableViewCell {

    weak var calculationDelegate: CalculationDelegate?   // delegate code for footer
    var additionalCalories: DailyCalories!                            // delegate code for footer
    var calculations: [DailyCalories] = []

    @IBOutlet weak var calorieTotal: UILabel!

    @IBOutlet weak var additionalFeesBtn: UIButton!


    @IBAction func overallTotalBtn(_ sender: Any) {
         self.additionalFeesDelegate?.onTouchInfoButton(from: self)   // delegate code for footer
    }
}

class CalorieTotalController: UIViewController {

    var additionalCalories: DailyCalories!             // delegate code for footer
    var calculations: [DailyCalories] = []            // delegate code for footer

    @IBOutlet weak var calorieSubtotal: UILabel!

    @IBOutlet weak var fatTotal: UILabel!
    @IBOutlet weak var carbTotal: UILabel!
    @IBOutlet weak var proteinTotal: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        // calculations done for when data is passed through Delegate
        var subtotal: Float = 0
        for item in calculations {
            if item.foodList.selectedOption == 1 {
                 subtotal = subtotal + (Float(item.foodList.calorie1) * Float(item.foodList.count))
            } else if item.foodList.selectedOption == 2 {
                 subtotal = subtotal + (Float(item.productList.calorie2) * Float(item.foodList.count))
            } else if item.foodList.selectedOption == 3 {
                 subtotal = subtotal + (Float(item.foodList.calorie3) * Float(item.foodList.count))
            }
        }

        let protein = Float(subtotal * 0.25)
        let carbs = Float(subtotal * 0.25)
        let fat = Float(subtotal * 0.5)

        calorieSubtotal.text = String(subtotal!)
        proteinTotal.text = String(protein!)
        fatTotal.text = String(fat!)
        carbTotal.text = String(carbs!)

    }

    @IBAction func closeButton(_ sender: Any) {
        dismiss(animated: true, completion: nil)
        print("Calories BreakDown")
    }    
}