How to limit the textfield entry to 2 decimal places in swift 4?

Question

I have a textfield and I want to limit the entry to max 2 decimal places.

number like 12.34 is allowed but not 12.345

How do I do it?

Answer 1

In Swift 4.

TextField have 10 digit limit and after decimal 2 digit limit (you can change the Limits). The dot will allow only one time in the textField.

class ViewController: UIViewController,UITextFieldDelegate {

    var dotLocation = Int()

    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {


        let nonNumberSet = CharacterSet(charactersIn: "0123456789.").inverted

        if Int(range.length) == 0 && string.count == 0 {
            return true
        }

        if (string == ".") {
            if Int(range.location) == 0 {
                return false
            }
            if dotLocation == 0 {
                dotLocation = range.location
                return true
            } else {
                return false
            }
        }

        if range.location == dotLocation && string.count == 0 {
            dotLocation = 0
        }

        if dotLocation > 0 && range.location > dotLocation + 2 {
            return false
        }

        if range.location >= 10 {

            if dotLocation >= 10 || string.count == 0 {
                return true
            } else if range.location > dotLocation + 2 {
                return false
            }

            var newValue = (textField.text as NSString?)?.replacingCharacters(in: range, with: string)
            newValue = newValue?.components(separatedBy: nonNumberSet).joined(separator: "")
            textField.text = newValue

            return false

        } else {
            return true
        }

    }

}