How to get total in footer cell of cells in sections?

UPDATE:

Currently Im able to get cells to add up their total in the sections Footer Cell. But I still can't get it to add up the different prices(Price1 - 3) for the cells that have a different prices selected passed into it the Section

code im using to add up total in the CartFooter for the Cells in the sections cartFooter.cartTotal.text = "\(String(cart.map{$0.cart.price1}.reduce(0.0, +)))"

PREVIOUSLY:

im trying to get the Cells in each section to add up their total in footer cell for each section that they're in.

The data in the CartVC is populated from another a VC(HomeVC). Which is why there is 3 different price options in the CartCell for when the data populates the cells.

Just kind of stuck on how I would be able to get the total in the footer for the cells in the section

Adding specific data for each section in UITableView - Swift

Thanks in advance, Your help is much appreciated

class CartViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

    var selectedProduct: Items!

    var cart: [Cart] = []
    var groupedCartItems: [String: [Cart]] = [:]
    var brands: [String] = []

    @IBOutlet weak var cartTableView: UITableView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.

        cartTableView.dataSource = self
        cartTableView.delegate = self

        groupedCartItems = Dictionary(grouping: cart, by: {$0.brand})
        brands = groupedCartItems.map{$0.key}.sorted()

    }

    func numberOfSections(in tableView: UITableView) -> Int {
        return brands
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        let brand = brands[section]
        return groupedCartItems[brand]!.count
    }

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

        let brand = brands[indexPath.section]
        let cartItemsToDisplay = groupedCartItems[brand]![indexPath.row]
        cartCell.configure(withCartItems: cartItemsToDisplay.cart)

        return cartCell
    }

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

        let headerTitle = brands[section]
        cartHeader.brandName.text = "Brand: \(headerTitle)"

    return cartHeader
    }

    func tableView(_ tableView: UITableView, viewForFooterInSection section: Int) -> UIView? {
         let cartFooter = tableView.dequeueReusableCell(withIdentifier: "FooterCell") as! FooterCell
        let sectionTotal = cart[section].getSectionTotal()

        cartFooter.cartTotal.text = "\(String(cart.map{$0.cart.price1}.reduce(0.0, +)))"

        return cartFooter
    }

}

---

class CartCell: UITableViewCell {

    @IBOutlet weak var productImage: UIImageView!
    @IBOutlet weak var productPrice: UILabel!
    @IBOutlet weak var productName: UILabel!

    func configure(withCartItems cartItems: Items) {
        productImage.sd_setImage(with: URL(string: cartItems.imageUrl))
        productName.text = "\(cartItems.brand): \(cartItems.name) ● \(cartItems.weight1)"
        let formatter = NumberFormatter()
        formatter.maximumFractionDigits = 2
        formatter.numberStyle = .decimal
        if cartItems.selectedOption == 1 {
            productPrice.text = "$\(formatter.string(for: cartItems.price1)!)"      

        } else if cartItems.selectedOption == 2 {
            productPrice.text = "$\(formatter.string(for: cartItems.price2)!)"

        } else if cartItems.selectedOption == 3 {
            productPrice.text = "$\(formatter.string(for: cartItems.price3)!)"

        }
    }
}

---

class Cart {
    var cart: Items!

    init(cart: Items) {

        self.cart = cart
    }
}


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 selectedOption: Int

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

}

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