How do I format UITextField text in real time, while it's being edited?

Question

How can I change value of UITextField text while typing?

In other word:

when I type 1 it should show 1

when I type 10 it should show 10

when I type 100 it should show 100 but

when I type 1000 it should show 1,000

Can you give any idea?

Answer 1

Swift:

Be sure to select the text field input as number pad, then:

In your viewDidLoad:

yourTextField(self, action: #selector(self.textFieldDidChange(textField:)), for: .editingChanged)

Then, in that same view controller:

func textFieldDidChange(textField: UITextField) {
        if textField == yourTextField {

            // Some locales use different punctuations.
            var textFormatted = textField.text?.replacingOccurrences(of: ",", with: "")
            textFormatted = textFormatted?.replacingOccurrences(of: ".", with: "")

            let numberFormatter = NumberFormatter()
            numberFormatter.numberStyle = .decimal
            if let text = textFormatted, let textAsInt = Int(text) {
                textField.text = numberFormatter.string(from: NSNumber(value: textAsInt))
            }
        }
    }