Want to get the calculated value from all rows - ios

Question

I have a table consist of more than 20 rows and each row has 3 text field named Rate, minutes and total. calculation is as rate/60 * minutes = total. I want to get total of all 20 rows in another text field Balance that is not a part of table view cell but of view controller. I want to calculate the value in real time and get the addition of total text field named as Rupees Text field below table view cell enter image description here.I can see on 3 rows on screen and 17 other are down. I get for only 3 text field in row not for all. I h have written this code but can calculate for 3 rows not for all 20. Please do check Thanks in advance. second issue I have used notification to pass string and it send me the last value in string not the updated one . Please do check the image
import UIKit
class calculationTVC: UITableViewCell, UITextFieldDelegate{
var numberOfItems = 0
var myTV : UITableView!
#IBOutlet weak var minutes: UITextField!
#IBOutlet weak var total: UITextField!
#IBOutlet weak var rate: UITextField!
#IBAction func rateChanged(_ sender: UITextField) {
// print(minutes.text, total.text, rate.text)
ratesischanged()
}
public func ratesischanged(){
let first = Double(rate.text!)
let second = Double(minutes.text!)
let third = Double(0)
if minutes.text?.count == 0{
total.text = "\(third)"
}
if minutes.text?.count == 0{
// print("null")
total.text = "\(third)"
// print("got zero")
}else{
let output = Double((first!/60) * second!)
total.text = "\(output)"
let rows = myTV.numberOfRows(inSection: 0)
var add : Double!
var c = [Int]()
for i in 0..<rows{
let path = IndexPath(row: i, section: 0)
let cell = myTV.cellForRow(at: path) as? calculationTVC
add = (cell?.total.text as NSString?)?.doubleValue
// print(Int(add))
//print(add)
if add != nil{
c += [Int(add)]
// print(c)
}
}
var sum = 0
var counter = 0
// Enter your code below
while counter < c.count {
var newValue = c[counter]
sum += newValue
counter += 1
// print(sum, "sum")
}
var myString = String(describing: sum)
NotificationCenter.default.post(name: calculationScreen.notificationName, object: nil, userInfo: ["DataMy": myString ?? ""])
//print(ar, "new ar")
}
}
func numberOfRows(numberInt : Int,tableView : UITableView){
numberOfItems = numberInt
myTV = tableView
}
}

Answer 1

you can define protocol on tableViewCell and fire it when the UITextField on each cell modified, and in your viewController implement of delegate:
protocol TableViewCellDelegate: class {
func textViewValueChanged(minutes: String, rate: String, total: String)
}
class calculationTVC: UITableViewCell { // delete UITextFieldDelegate
weak var delegate: TableViewCellDelegate?
// ... the rest of your code
#IBAction func textFieldEditingChanged(_ sender: UIButton) { //action of ***Editing Changed*** and connected to all *UITextField*
//calculate total
delegate?.textViewValueChanged(minutes: self.minutes, rate: self.rate, total: self.total)
}
}
class viewController: UIViewController, UITableView, UITableViewDelegate, UITableViewdataSource, TableViewCellDelegate { //and what you want to implement
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cellIdentifier", for: IndexPath) as? calculationTVC
cell.delegate = self
// ... the rest of your code
return cell
}
func textViewValueChanged(minutes: String, rate: String, total: String) {
var total = 0
for i in 1...20 {
let cell = tableView.cellForRow(at: i) as? calculationTVC
total += cell.rate/60 * cell.minutes
}
//set your totalLabel
}
}