如何使用自定义标题按节排列单元格

我已设置代码以按品牌排列CartVC中的单元（将品牌放置在CartHeaderCell中）。当数据从HomeVC传递到CartVC时，我无法从我在CartVC中创建的代码中按品牌将单元格按节排列。 （当前代码将数据从HomeVC传递到CartVC，而没有将单元格分成几部分）

将数据传递到购物车后，如何在CartVC中按品牌排列这些部分

更新：

现在，CartViewController Extension中的代码将单元格划分为多个部分，然后按品牌将其传递到单元格中，但是将所有单元格加扰为随机部分，或者在单元格中为品牌创建一个新部分，和/或在按下CartBtn时使模拟器崩溃，或者在多个部分中显示相同的项目/单元格

extension HomeController: UITableViewDelegate,UITableViewDataSource {

    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
        return itemSetup.count
    }

    func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(withIdentifier: "HomeCell") as? HomeCell else { return UITableViewCell() }

        let item = itemSetup[indexPath.row]
        cell.configure(withItems: item)

        // passes data to the Cart Cells in the CartVC when ATC Btn is pressed in each HomeCell
        cell.addactionHandler = { (option: Int) in
            print("Option selected = \(option)")
            Tray.currentCart.cartItems.append(item)
            item.selectedOption = option
        }

        return cell
    }
}

import UIKit

class CartViewController: UIViewController {

    var items: Items!

    // arranges cells into sections
    var tray: [Tray] = []
    var sortedBrandsByName: [String] = []
    var sections: [[Tray]] = [[]]

    @IBOutlet weak var cartTableView: UITableView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // arranges cells into sections
        let brandNames = tray.map { $0. titleBrandName }
        let uniqueBrandNames = Array(Set(brandNames))           
        let sortedBrandNames = uniqueBrandNames.sorted()
        let sections: [[Tray]] = sortedBrandNames.map { firstBrandNames in
            return tray
                .filter { $0. titleBrandName == firstBrandNames } 
                .sorted { $0.cart.brand < $1.cart.brand } // sort them
        }

        // Do any additional setup after loading the view.
        cartTableView.dataSource = self
        cartTableView.delegate = self

    }
}

extension CartViewController: UITableViewDataSource,UITableViewDelegate {

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

    func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int {

        //allows data passed from the HomeVC populate the CartCells
        return Tray.currentCart.cartItems[section].count
    }

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

        // **active code** that allows data passed from the HomeVC populate the CartCells
        let cart = Tray.currentCart.cartItems[indexPath.row]
        cell.configure(withItems: cart)

        return cell
    }

    func tableView(_ tableView: UITableView,viewForHeaderInSection section: Int) -> UIView? {
        let cartHeader = tableView.dequeueReusableCell(withIdentifier: "CartHeaderCell") as! CartHeaderCell
        cartHeader.storeName.text = Tray.currentCart.cartItems[section].brand
        return cartHeader
    }

    func tableView(_ tableView: UITableView,heightForHeaderInSection section: Int) -> CGFloat {
        return 45
     } 
}

class CartHeaderCell: UITableViewCell {

    @IBOutlet weak var brandName: UILabel!

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }
}

class CartCell: UITableViewCell {

    @IBOutlet weak var lblMealName: UILabel!
    @IBOutlet weak var imageUrl: UIImageView!
    @IBOutlet weak var lblSubTotal: UILabel!
    @IBOutlet weak var lblQty: UILabel!

    override func awakeFromNib() {
         super.awakeFromNib()
        // Initialization code
    }

    // allows the data to be passed into the cart cells

    func configure(withItems items: Items) {
        imageUrl.sd_setImage(with: URL(string: items.imageUrl))
        lblQty.text = "\(items.count)"
        let formatter = NumberFormatter()
        formatter.maximumFractionDigits = 2
        formatter.numberStyle = .decimal
        if items.selectedOption == 1 {
            lblSubTotal.text = "$\(formatter.string(for: items.price1 * Float(items.count))!)"
            lblMealName.text = "\(items.name) ● \(items.weight1)"
        } else if items.selectedOption == 2 {
            lblSubTotal.text = "$\(formatter.string(for: items.price2 * Float(items.count))!)"
            lblMealName.text = "\(items.name) ● \(items.weight2)"
        } else if items.selectedOption == 3 {
            lblSubTotal.text = "$\(formatter.string(for: items.price3 * Float(items.count))!)"
            lblMealName.text = "\(items.name) ● \(items.weight3)"
        }
    } 
}

// allows the code that is passed to the CartVC when an item is passed from the HomeVC to the CartVC
class Tray {
    static let currentCart = Tray()
    var cartItems = [Items]()
    var cart: Items!
    var sectionTitle: String!
}

extension Tray {
    var titleBrandName: String {
        return String(self.cart.brand[self.cart.brand.startIndex]).uppercased()
    }
}