如何在从tableview中删除特定节后隐藏表视图中的各节？

Question

我有三个部分(见图)，其中一个部分显示项目，剩下的两个单元格现在使用闪存板设计，如果我使用第一节中的“删除”按钮删除所有项目，那么剩下的两个部分需要隐藏，并显示一些文本，任何人可以帮助我这样做吗？

func numberOfSections(in tableView: UITableView) -> Int{
    // #warning Incomplete implementation, return the number of sections
    return 3
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
    if (section == 0){
        return itemsArray.count
    }else{
        return 1
    }
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    if indexPath.section == 0{
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! productTableViewCell
        tableDetails.isHidden = false
        myActivityIndicator.stopAnimating()
        let arr = itemsArray[indexPath.row]
        let urls = NSURL(string: arr["img"] as! String)
        let data = NSData (contentsOf: urls! as URL)
        cell.imageview.image = UIImage(data: data! as Data)
        cell.nameLabel.text = arr["productName"]as! String
        var price = arr["productPrice"] as! String
        print(price)
        var Quantity : Float = 1
        let itemId : Int =  arr["sku"] as! Int
        print(itemId)
        for aDic in CartArray{
            if aDic["id"] == String(itemId){

                Quantity = Float(String(aDic["quantity"]!))!
            }
        }
        print(CartArray)
        cell.stepper.value = Double(Int(Quantity))
        cell.stepper.tag = indexPath.row
        cell.stepper.addTarget(self, action: #selector(stepperValueChange(stepper:)), for:.valueChanged)
        price = price.replacingOccurrences(of: "KD", with: "")
        cartstring = String(Float(price)! * Quantity) + "0KD"
        cell.priceLabel.text = cartstring
        let quantityText = String(Quantity)
        let endIndex = quantityText.index(quantityText.endIndex, offsetBy: -2)
        let truncated = quantityText.substring(to: endIndex)
        cell.quantityTextField.text = truncated
        cell.price = price
        cell.deleteButton.addTarget(self, action: #selector(deleteButtonAction(button:)), for: .touchUpInside)
        cell.deleteButton.tag = indexPath.row
        return cell
    }else if indexPath.section == 1{
        let cell = tableView.dequeueReusableCell(withIdentifier: "couponcell", for: indexPath) as! CouponTableViewCell
        cell.applyButton.addTarget(self, action: #selector(applyButtonAction(button:)), for: .touchUpInside)
        return cell
    }else {
        let cell = tableView.dequeueReusableCell(withIdentifier: "checkout", for: indexPath) as! checkoutTableViewCell
        cell.finalCartpriceLabel.text = total
        return cell
    }
}
func deleteButtonAction(button : UIButton) {
        let buttonPosition = button.convert(CGPoint(), to: tableDetails)
        let index = tableDetails.indexPathForRow(at: buttonPosition)
        self.itemsArray.remove(at: (index?.row)!)
        self.tableDetails.deleteRows(at: [index!], with: .automatic)
        tableDetails.reloadData()
     }

Answer 1

这段代码对我非常有用。

func deleteButtonAction(button : UIButton) {
        let buttonPosition = button.convert(CGPoint(), to: tableDetails)
        let index = tableDetails.indexPathForRow(at: buttonPosition)
        self.itemsArray.remove(at: (index?.row)!)
        self.tableDetails.deleteRows(at: [index!], with: .automatic)
        tableDetails.reloadData()
        if (tableView(tableDetails, numberOfRowsInSection: 0) == 0){
            tableDetails.isHidden = true
        }
        if (tableDetails.isHidden == true){
            self.loadingLabel.textColor = UIColor.gray
            self.loadingLabel.textAlignment = NSTextAlignment.center
            self.loadingLabel.text = "Your shopping cart is empty"
            self.loadingLabel.frame = CGRect(x: 130, y: 320, width: 140, height: 30)
            view.addSubview(loadingLabel)
            }
}

Answer 2

您只需检查您的self.itemsArray.count > 0中的func numberOfSections(in:)，并显示此条件的所有三个部分。否则，只返回第一个部分，这将自动隐藏另外两个部分。

示例：

func numberOfSections(in tableView: UITableView) -> Int {
    if self.itemsArray.count > 0 {
        return 3
    }
    return 1
}

Answer 3

使用以下内容修改numberOfSections：

func numberOfSections(in tableView: UITableView) -> Int {
    if self.itemsArray.count > 0 {
        return 3
    }
    //Show Message List is Empty
    return 1
}