当产品在购物车中时显示数量标签(Swift 5)

Question

当用户将产品添加到 cart.The 时，所选产品必须显示递增和递减按钮。和其他产品应该只显示添加按钮。你可以查看这张图片

问题是，当我再次返回此屏幕时，它应该显示数量标签，直到产品进入购物车。因为我在后端没有属性存储产品是否在购物车中的布尔值？谁能告诉同样的事情如何在前端做到这一点？这样只有购物车中的商品会在产品 TableView 中显示数量标签。

这是我的代码

产品表格视图

func getCartDetails()
    {
        ApiCaller().getData(url: get_cart_url, resultType: CartResult.self) { (results) in
            self.iddd = results.result!.id
            self.c = results.result!
            guard let resultArray = results.result?.cartItems as? [CartItem] else {return }
            UserDefaults.standard.set(results.result?.cartItems.count, forKey: "totalItemsInCart")
            
            for cart in resultArray
            {
                
                self.cAr.append(cart)
                
            }
            
            
            
        }
        
    }


func addItem(prodId:String,qty:Int,cartId:String)
    {
 
        let request = cartProducts(products: [addCartProducts(prodId:prodId, q: qty + 1)])
        
        do
        {
            let encodedResult = try JSONEncoder().encode(request)
            
            ApiCaller().postData(url: update_cart_url+cartId+"/update", requestBody: encodedResult, requestMethod: "PUT", resultType: UpdateCartResults.self) { (results) in
                print(results.statusCode)
              
                
                DispatchQueue.main.async {
                   

                    self.tableView.reloadData()
                }
                
            }
            
            
        }catch {
            print(error)
            return
        }
            
        
    }


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

        cell.generateCells(products: productArray[indexPath.row])
        
 
        let attributeString: NSMutableAttributedString =  NSMutableAttributedString(string: rupee + "\(productArray[indexPath.row].mrpAfterDiscount)")
        attributeString.addAttribute(NSAttributedString.Key.strikethroughStyle, value: 1, range: NSMakeRange(0, attributeString.length))
        
        cell.secondPriceLbl.attributedText = attributeString
        
        cell.addBtnLbl.tag = indexPath.row
        
        


let productAtIndex = self.productArray[indexPath.row]

          
        
        if cAr.contains(where: { (item) -> Bool in
            productAtIndex.id == item.id
        }){
            // product is in cart, show increment/decrement button
            
             cell.addBtnLbl.isHidden = true
        } else {
            // product not in cart, show add button
            
             cell.addBtnLbl.isHidden = false
        }
        
        cell.callBackForAddButtonHidden = {
        
            cell.addBtnLbl.isHidden = true
            guard self.c != nil else {
                print("Creating cart for the first time")
                self.createCart(prodId: self.productArray[indexPath.row].id, qty: 1)
                return
                
            }
                self.addItem(prodId: self.productArray[indexPath.row].id, qty: 0, cartId: self.c!.id)
        }
        
    
        cell.selectionStyle = .none
        
        return cell
    }

这是我的产品 TableView 单元格我尝试使用比较 cartDetails 和 productDetails 但它没有用所以我评论它。

func generateCells(products:Product)
    {
        self.productNameLbl.text = products.name
        self.productDescriptionLbl.text = products.additionInfo
        self.productPriceLbl.text = rupee + String(products.productMRP)

        if products.discountPercentage != 0
        {
        self.discountLbl.text = "\(products.discountPercentage)% Off"
        } else {
            self.discountLbl.isHidden = true
        }
        //

//        if products.id == cartDetails.id
//        {
//            addBtnLbl.isHidden = true
//            self.quantityLbl.text = "\(cartDetails.qty)"
//        } else {
//            addBtnLbl.isHidden = false
//        }
        
        
        self.productImgView.sd_setImage(with: URL(string: products.imgURL)) { (image, error, cache, url) in
            
        }
        
    }

Answer 1

假设您的卡片是 Product 的数组，您可以检查 cellForRowAt indexPath 当前索引处的项目是否存在于您的购物车中，并相应地检查 show/hide 按钮。

let productAtIndex = self.productArray[indexPath.row]

    if cart.contains(where: { (item) -> Bool in
        productAtIndex.id == item.id
    }){
        // product is in cart, show increment/decrement button
    } else {
        // product not in cart, show add button
    }

当产品在购物车中时显示数量标签(Swift 5)

Show Quantity label when product is in cart(Swift 5)

xcode

swift

swift2

swift5