Tableview cell randomly place string in empty textview - swift

Question

In my swift code below there is a add button pressed to add another tableview cell. The problem is that in the sixth tableview cell that is added the number 1 is just randomly there and this problem would repeat every time another cell is added. You can see what I am talking about in the gif below. What I am looking for in a answer is just getting the cell added with nothining in the text view.
import UIKit
/*
*/
class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {
var addBTN = UIButton()
var arr = [nil] as [Any?]
var currentIndex = 0
var arrayValues = [Int]()
var index = Int()
var pic = UIImageView()
var cellCount = 0
var tableview = UITableView()
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return arr.count
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 118
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! CustomTv
return cell
}
override func viewDidLoad() {
super.viewDidLoad()
[addBTN].forEach{
$0.translatesAutoresizingMaskIntoConstraints = false
view.addSubview($0)
}
tableview.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height * 0.8)
addBTN.frame = CGRect(x: view.frame.width / 2, y: view.frame.height * 0.8, width: view.frame.width / 2 , height: view.frame.height / 5)
addBTN.backgroundColor = .systemTeal
view.addSubview(tableview)
tableview.register(CustomTv.self, forCellReuseIdentifier: "cell")
tableview.delegate = self
tableview.dataSource = self
pic.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height )
addBTN.addTarget(self, action: #selector(newCell), for: .touchDown)
addBTN.setTitle("New cell", for: .normal)
}
#objc func newCell(){
cellCount += 1 // update the value
arr.append(1)
tableview.beginUpdates()
tableview.insertRows(at: [IndexPath(row: arr.count - 1, section: 0)], with: .automatic) /// animate the insertion
tableview.endUpdates()
}
}
class CustomTv: UITableViewCell {
lazy var backView : UIView = {
let view = UIView(frame: CGRect(x: 10, y: 6, width: self.frame.width , height: 110))
view.backgroundColor = .green
return view
}()
lazy var txt : UITextField = {
let btn = UITextField(frame: CGRect(x: 150-25, y: 60, width: 100 , height: 50))
btn.backgroundColor = .orange
return btn
}()
override func layoutSubviews() {
backView.clipsToBounds = true
backView.frame = CGRect(x: 0, y: 6, width: bounds.maxX , height: 110)
addSubview(backView)
backView.addSubview(txt)
}
}

Answer 1

implement the prepareForReuse method inside the cell class
and within the method clear the text field
override func prepareForReuse() {
// clear the text field
}