如何使用自定义标题将单元格排列成节？

Question

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中的单元格（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）

数据传递到购物车后，如何在CartVC中按品牌排列部分

更新：

现在，代码中的代码CartViewController Extension将单元划分为多个部分，然后将各个项目按品牌传递到各个单元中，但是将所有单元加扰为随机部分，或者在单元中为该品牌创建一个新的部分，并且/或者当按下CartBtn，或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()
    }
}


class Items {
    var id: String
    var name: String
    var brand: String
    var price1: Float
    var price2: Float
    var price3: Float
    var weight1: String
    var weight2: String
    var weight3: String
    var imageUrl: String
    var count: Int
    var selectedOption: Int

    init(id: String,
         name: String,
         brand: String,
         price1: Float,
         price2: Float,
         price3: Float,
         weight1: String,
         weight2: String,
         weight3: String,
         imageUrl: String,
         count: Int,
         selectedOption: Int) {

        self.id = id
        self.name = name
        self.brand = brand
        self.price1 = price1
        self.price2 = price2
        self.price3 = price3
        self.weight1 = weight1
        self.weight2 = weight2
        self.weight3 = weight3
        self.imageUrl = imageUrl
        self.count = count
        self.selectedOption = selectedOption

    }

    convenience init(dictionary: [String : Any]) {
        let id = dictionary["id"] as? String ?? ""
        let name = dictionary["name"] as? String ?? ""
        let brand = dictionary["brand"] as? String ?? ""
        let price1 =  dictionary["price1"] as? Float ?? 0.0
        let price2 =  dictionary["price2"] as? Float ?? 0.0
        let price3 =  dictionary["price3"] as? Float ?? 0.0
        let weight1 =  dictionary["weight1"] as? String ?? ""
        let weight2 =  dictionary["weight2"] as? String ?? ""
        let weight3 =  dictionary["weight3"] as? String ?? ""
        let imageUrl =  dictionary["imageUrl"] as? String ?? ""
        let count = dictionary["count"] as? Int ?? 00
        let selectedOption = dictionary["selectedOption"] as? Int ?? 00

        self.init(id: id,
                  name: name,
                  brand: brand,
                  price1: price1,
                  price2: price2,
                  price3: price3,
                  weight1: weight1,
                  weight2: weight2,
                  weight3: weight3,
                  imageUrl: imageUrl,
                  count: count,
                  selectedOption: selectedOption)
    }

}