How to Make Adding data labels to table cell and the sum data cell in Swift 4

Please add this

var List: [String] = [""]

var sum = 0

then in your second view controller

after List.append(textIsi.text!) add this

sum += Int(textIsi.text!)! Like this

List.append(textIsi.text!)
sum += Int(textIsi.text!)! 
labelRp.text = "\(sum)"

then full code in InAndDelRowViewController

import UIKit

class InAndDelRowViewController: UIViewController {
    @IBOutlet weak var labelRp: UILabel!
    @IBOutlet weak var textIsi: UITextField!
    @IBOutlet weak var bAdd: UIButton!
    @IBOutlet weak var tblView: UITableView!
    
    var List: [String] = [""]
    var sum = 0
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.tblView.delegate = self
        self.tblView.dataSource = self
        self.tblView.rowHeight = UITableViewAutomaticDimension
        self.tblView.estimatedRowHeight = 100.0
        self.tblView.separatorInset = UIEdgeInsetsMake(0, UIScreen.main.bounds.width, 0, 0)
        self.tblView.register(UINib(nibName: "InDelTableViewCell", bundle: nil), forCellReuseIdentifier: "cell")
        
        //membuat tabel bawah kosong (tabel ada klw ada data)
        tblView.tableFooterView = UIView(frame: CGRect.zero)
        
        

    }

    @IBAction func bAddAction(_ sender: UIButton) {
        print(self.List)
        insertNewVTitle()
    }
    func insertNewVTitle() {
        
        List.append(textIsi.text!)
        sum += Int(textIsi.text!)!
        labelRp.text = "\(sum)"
        
        let indexPath = IndexPath(row: List.count - 1, section: 0)
        
        tblView.beginUpdates()
        tblView.insertRows(at: [indexPath], with: .automatic)
        tblView.endUpdates()
        
        textIsi.text = ""
        view.endEditing(true)
    }
    
    
}

extension InAndDelRowViewController: UITableViewDelegate, UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return List.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        
        let Title = List[indexPath.row]
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! InDelTableViewCell
        cell.labelTest.text = Title
     
        return cell
    }
    
    //for edit
    func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        return true
    }
    
    func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
        
        if editingStyle == .delete {
            List.remove(at: indexPath.row)
            tableView.beginUpdates()
            tableView.deleteRows(at: [indexPath], with: .automatic)
            tableView.endUpdates()
        }
    }
    
    
}