Question

数据模型：

＆＃13;

import Foundation

class CartItem {
    
    var mealSize: MealSize
    var qty: Int
    var pName: String
    
    init(mealSize: MealSize, qty: Int, pName: String){
        self.mealSize = mealSize
        self.qty = qty
        self.pName = pName
    }
}


class Cart {
    
    static let currentCart = Cart()
    
    var restaruant: Restaruant?
    var items = [CartItem]()
    var address: String?
    var name: Meal?
    
    func getTotal() -> Float {
        var total: Float = 0
        
        for item in self.items {
            total = total + Float(item.qty) * item.mealSize.price!  
        }
        return total
    }
    func reset() {
        self.restaruant = nil
        self.items = []
        self.address = nil
        self.name = nil
    }
}

＆＃13;

用餐VC，以便用户点击将商品添加到购物车。

＆＃13;

class ProductDetailViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {

   var meal: Meal?
    var restaurant: Restaurant?
    var mealSize = [MealSize]()
    var mealSizes: MealSize?
    var pName: String = ""
    
    var qty = 1
    var ps: String = ""
    
 
     
    //    Picker Information.
   
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return mealSize.count
    }
    
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        
        let item = self.mealSize[row]
        
        
        mealSize = item
        priceLbl.text = "$"+"\((item.price)!)"
        
        //PS Product Size. Used to reference the size id.
        ms = "\((item.price)!)"
        print("\((item.price)!)")

        
        return "\((item.sizeString)!)"
    }
    

    



@IBAction func addTo(_ sender: Any) {

let cartItem = CartItem(mealSize: self.mealSizes!, qty: self.qty, pName: self.pName)

                        guard let cartRestaurant = Cart.currentCart.restaurant, let currentRestaurant = self.restaurant else {

                            //If requirements are not met
                            Cart.currentCart.restaurant = self.restaurant
                            Cart.currentCart.items.append(cartItem)

                            return
                        }
                        
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "cartInfo" {
     
            let controller = segue.destination as! CartController
            controller.meal = meal
            
        }
    }

＆＃13;

然后我将我的用户转移到购物车页面以添加项目，从这里，我需要用户可以选择返回并编辑他们的购物车。

＆＃13;

import UIKit
import MapKit
import CoreLocation

class CartClass: UIViewController

 var meal: Meal!
 var mealSizes: MealSize!

//Populate products in cart.
extension CartController: UITabBarDelegate, UITableViewDataSource {
    
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return    Cart.currentCart.items.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "shoppingCartCell", for: indexPath) as! CartCell
        
            let cart = Cart.currentCart.items[indexPath.row]
            let cartTotal = cart.mealSize.price! * Float(cart.qty)
            let name = cart.mealSize.sizeString! + "(s)" + " of " + cart.pName
            cell.lblQty.text = "\(cart.qty)"
            cell.lblTotal.text = "$" + String(format: "%.02f", cartTotal)
            cell.lblName.text = name
        
        return cell
        
    }

＆＃13;

我已将所有商品添加到购物车中并完美打印出来。我创建了一个按钮，用于从购物车中删除商品，但是，我没有选项来编辑各个选项。我将如何使用此代码执行此操作？

如何在用户进行segued，Swift之后更新数组单个元素

0 个答案: