Adding Thousand Separator Automatically (Swift) - ios

Question

I have a code for my calculator
How could I do so that when the user would enter the numbers he would be separated by a space automatically?
I've been trying to find an answer for a long time, but nothing fits that it was displayed right away
var currentInput: Double {
get {
return Double (displayResultLabel.text!)!
}
set {
let value = "\(newValue)"
let ValueArray = (value.components(separatedBy:"."))
if ValueArray[1] == "0" {
displayResultLabel.text = "\(ValueArray[0])"
} else {
displayResultLabel.text = "\(newValue)"
}
stillTyping = false
}
}
#IBAction func numberPressed(_ sender: UIButton) {
let number = sender.currentTitle!
if stillTyping {
if (displayResultLabel.text?.characters.count)! < 14 {
displayResultLabel.text = displayResultLabel.text! + number
}
} else {
displayResultLabel.text = number
stillTyping = true
}
}
Then what happened:
#IBAction func numberPressed(_ sender: UIButton) {
let number = sender.currentTitle!
if stillTyping {
if (displayResultLabel.text?.characters.count)! < 14 {
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
let newNumber = NSNumber(value: Double(displayResultLabel.text! + number)!)
displayResultLabel.text = formatter.string(from: newNumber)
}
} else {
displayResultLabel.text = number
stillTyping = true
}
}
Error
var stillTyping = false
var dotIsPlaced = false
var firstOperand: Double = 0
var secondOperand: Double = 0
var operationSign: String = ""

Answer 1

It is better to accumulate your value in a separate string that doesn't have the formatting applied rather than using the text field as your data model. You can then format the decimal and display it in the label as required using a NumberFormatter:
let formatter: NumberFormatter = {
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
return formatter
}()
var currentInput: String = "0" {
didSet {
self.displayResultLabel?.text = self.currentDisplay
}
var currentValue: Double {
return Double(self.currentInput) ?? 0
}
var currentDisplay: String {
return formatter.string(from: NSNumber(value:self.currentValue)) ?? "0"
}
func addDigit(_ digit: Int) {
if currentInput.count < 14 {
let newValue = self.currentValue * 10 + Double(digit)
self.currentInput = "\(newValue)"
}
}
#IBAction func numberPressed(_ sender: UIButton) {
guard let digit = Int(sender.currentTitle!) else {
return
}
self.addDigit(digit)
}

Answer 2

This is what NumberFormatters are for
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
if let newNumber = formatter.number(from: displayResultLabel.text! + number){
displayResultLabel.text = formatter.string(from: newNumber)
}
Note that NumberFormatters go both ways, and you can (and probably should) use them to parse numbers from strings, too