Setting a max int value (not character count) to a UITextField

Question

In Swift, is it possible to set a max INT value to a UITextField?

My use-case is I have 5 text fields that need to have a maximum int value. These values range from

Answer 1

You can check if the current value in the text field is less than the maximum integer value you've specified:

(You might want to change the keyboard type to .NumberPad at this point to let user type only numeric values.)

textField.keyboardType = .NumberPad

--

func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
  let newText = NSString(string: textField.text!).stringByReplacingCharactersInRange(range, withString: string)
  if newText.isEmpty {
    return true
  }
  else if let intValue = Int(newText) where intValue <= self.maxValue {
    return true
  }
  return false
}

I created an example project for you. You can download and play around with it.