如何使用 UITableViewCell 的委托方法在标签中设置计算？

Question

我正在设置 CartViewController 和 PopUpFeesController。

在 CartVC 中，我有一个单元格加在 CartFooter cartTotal 标签内，代表小计。同样在这里，我有 3 个标签，代表 PopUpFeesController 中小计、salesTax 和总计的转换。

在 CartFooter 中，我拥有所有出口，并有一个委托与 CartVC 进行通信。 popupFeesBtn

在 PopupFeesController 中，我有 3 个 UILabel（sTotal、stax 和 oaTotal）。当我按下 popupFeesBtn（在 CartFooter 中）时，我想在 PopupFeesController 中设置具有正确值的标签以在标签中显示转换。

因为我无法将 cartTotal 转换为 PopupFeesController 中的标签，所以我需要如何使用该委托方法设置 UILabel(cartTotal)？

我怎样才能获得从 CartVC CartFooter Cell cartFooter 标签传递到 PopUpFeesViewController 的小计，以便它可以从小计计算税金和总计，并将它们显示在 PopUpFeesViewController 的标签中

我尝试设置我的代码类似于下面link中的代码

我已经尝试与代表传递数据。还有其他更好的方法吗？

import UIKit

class CartViewController: UIViewController {

    var selectedFood: FoodList!       // allows data to be passed into the CartVC

    var cartValue : Float  = 0.0

    // allows data to be sepearted into sections
    var cartItems: [CartItem] = []
    var groupedCartItems: [String: [CartItem]] = [:]
    var storeSectionTitle: [String] = []

    @IBOutlet weak var tableView: UITableView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.

    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "AdditionalCosts" {
        let vc: PopupFeesController = segue.destination as! PopupFeesController
            vc.calculateFeesDelegate = self
        }
    }
}
extension CartViewController: UITableViewDelegate, UITableViewDataSource{

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

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

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

        let store = storeSectionTitle[indexPath.section]
        let cartItemsToDisplay = groupedCartItems[store]![indexPath.row]
        cartCell.configure(withCartItems: cartItemsToDisplay.foodList)

        return cartCell
    }

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

        let headerTitle = storeSectionTitle[section]
        cartHeader.storeName.text = "\(headerTitle)"

        return cartHeader
    }

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

        //Cell Total Code
        let store = storeSectionTitle[section]
        let arrAllItems = groupedCartItems[store]!
        var subtotal: Float = 0
        for item in arrAllItems {
            if item.productList.selectedOption == 1 {
                subtotal = subtotal + (Float(item.foodList.price) * Float(item.foodList.count))
            }
        }

        let numberFormatter = NumberFormatter()
        numberFormatter.numberStyle = .currency
        let total = numberFormatter.string(from: NSNumber(value: Float(subtotal)))
        subtotal = cartValue

        cartFooter.cartTotal.text = String(total!)
        cartFooter.additionalCostsDelegate = self

        return cartFooter
    }    
}

extension CartViewController: AdditionalCostsDelegate {
    func onTouchAdditionalCostsInfo(info: Float?) {
        let popUp = self.storyboard?.instantiateViewController(withIdentifier: "AdditionalCostsVC") as! PopUpViewController
        print("Subtotal: \(cartValue)")
        cartValue = Float(info ?? 0.00)

        self.present(popUp, animated: true) {
            popUp.subtotalLbl.text = "\(String(describing: info))"
        }
    }
}

extension CartViewController: CalculateFeesDelegate {
    func calculateFees(_ stotal: UILabel, _ sTax: UILabel, _ oaTotal: UILabel) {

        let subtotal = cartValue
        let tax = subtotal * Float(0.0825)
        let total = subtotal + tax

        let numberFormatter = NumberFormatter()
        numberFormatter.numberStyle = .currency
        let total = numberFormatter.string(from: NSNumber(value: Float(subtotal)))
        let salesTax = numberFormatter.string(from: NSNumber(value: Float(tax)))
        let overallTotal = numberFormatter.string(from: NSNumber(value: Float(total)))

        stotal.text = "\(String(describing: total))"
        sTax.text = "\(String(describing: marijuanaTax))"
        oaTotal.text = "\(String(describing: overallTotal))"
    }    
}

protocol AdditionalCostsDelegate: class {
    func onTouchAdditionalCostsInfo(info: Float?)
}

class CartFooter: UITableViewCell {

    var additionalCostsDelegate: AdditionalCostsDelegate? = nil

    @IBOutlet weak var cartTotal: UILabel!

    @IBOutlet weak var popupFeesBtn: UIButton!

    @IBAction func popFeesOnClicked(_ sender: Any) {
        sendData2PopupFees()
    }

    func sendData2PopupFees(){
        self.additionalCostsDelegate?.onTouchAdditionalCostsInfo(info: Float(cartTotal?.text! ?? "0.0"))
    }
}

protocol CalculateFeesDelegate {
    func calculateFees(_ stotal: UILabel, _ sTax: UILabel, _ oaTotal: UILabel)
}

class PopupFeesController: UIViewController {

    @IBOutlet weak var subtotalLbl: UILabel!
    @IBOutlet weak var salesTaxLbl: UILabel!
    @IBOutlet weak var overallTotalLbl: UILabel!

    var calculateFeesDelegate: CalculateFeesDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()

        let subtotal = Float(subtotalLbl.text!)

        let tax = Float((subtotal) * 0.0825) // getting an error here when pressing popupFeesBtn => Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value
        let total = Float((subtotal) + salesTax)
        let numberFormatter = NumberFormatter()
        numberFormatter.numberStyle = .currency
        let sTotal = numberFormatter.string(from: NSNumber(value: Float(subtotal!)))
        let salesTax = numberFormatter.string(from: NSNumber(value: Float(tax)))
        let overallTotal = numberFormatter.string(from: NSNumber(value: Float(total)))

        subtotalLbl.text = "\(subTotal)"
        salesTaxLbl.text = "\(salesTax)"
        overallTotalLbl.text = "\(total)"
    }

    @IBAction func returnButton(_ sender: Any) {
        dismiss(animated: true, completion: nil)
    }

}

class CartItem {
    var foodList: FoodList!

    init(foodList: FoodList) {

        foodList = foodList
    }
}

Answer 1

将您的 UILabel 作为子视图添加到 UItableviewcell 容器视图中。
添加尾随、前导、顶部、底部约束。
设置UILabel行数0。

为动态高度添加重写 heightForRowAt 方法。

override func tableView(_ tableView: UITableView, heightForRowAt 
indexPath: IndexPath) -> CGFloat {
     return UITableViewAutomaticDimension
}

Answer 2

首先我想告诉你一切都按照你的要求做了。您只需在 class PopupFeesController 中创建一个 Float 类型的变量。您必须将此方法的值 "onTouchAdditionalCostsInfo" 传递给 PopupFeesController。

您必须用您的代码替换 PopupFeesController 代码和“onTouchAdditionalCostsInfo”，您的数据将从一个视图控制器传递到另一个视图控制器。

class PopupFeesController: UIViewController {

@IBOutlet weak var subtotalLbl: UILabel!
@IBOutlet weak var salesTaxLbl: UILabel!
@IBOutlet weak var overallTotalLbl: UILabel!

var calculateFeesDelegate: CalculateFeesDelegate?
var totalCartValue : Float  = 0.0

override func viewDidLoad() {
    super.viewDidLoad()

    print("\(totalCartValue)")
    let subtotal = Float(subtotalLbl.text!)

    let tax = Float((subtotal) * 0.0825) // getting an error here when pressing popupFeesBtn => Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value
    let total = Float((subtotal) + salesTax)
    let numberFormatter = NumberFormatter()
    numberFormatter.numberStyle = .currency
    let sTotal = numberFormatter.string(from: NSNumber(value: Float(subtotal!)))
    let salesTax = numberFormatter.string(from: NSNumber(value: Float(tax)))
    let overallTotal = numberFormatter.string(from: NSNumber(value: Float(total)))

    subtotalLbl.text = "\(subTotal)"
    salesTaxLbl.text = "\(salesTax)"
    overallTotalLbl.text = "\(total)"
}

@IBAction func returnButton(_ sender: Any) {
    dismiss(animated: true, completion: nil)
}

}


extension CartViewController: AdditionalCostsDelegate {
  func onTouchAdditionalCostsInfo(info: Float?) {
    let popUp = self.storyboard?.instantiateViewController(withIdentifier: "AdditionalCostsVC") as! PopUpViewController
    popUp.totalCartValue = Float(info ?? 0.00)
    self.present(popUp, animated: true) {
        popUp.subtotalLbl.text = "\(String(describing: info))"
    }
  }
}

如何使用 UITableViewCell 的委托方法在标签中设置计算？

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