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iOS

Posted by Jose Ines Cantu Arrambide
Jose Ines Cantu Arrambide
43 Points

Is there a lesson on constricting a UITextField to positive numbers only ?

Any lesson on forcing a UITextField to accept only positive numbers? With a minimum and maximum ?

2 Answers

Jose Ines Cantu Arrambide
Jose Ines Cantu Arrambide
43 Points

Richard thank you for your reply :) Do you know what delegate method would be the best to validate the minimum and maximum values of the UITextField ?

Richard Lu
Richard Lu
20,185 Points

Hey Jose,

This delegate method should work:

func textFieldDidEndEditing(textField: UITextField) {
   if let text = textField.text, let number = Int(text)  {
       if number > someNumber {
          // do something    
       } else {
          // do something
       }
   }
}
Richard Lu
Richard Lu
20,185 Points
Richard Lu
Richard Lu
20,185 Points

Hey Jose,

From what I understand you want a UITextField to only accept numbers that are positive. I'm not sure if this is a way that you would want to go about it, but you can change the keyboard type to a numberpad like this

someTextField.keyboardType = UIKeyboardType.NumberPad

This would result in only accepting positive numbers.

keypad

If this isn't what you're looking for, I'd suggest searching for customized keyboards.

edit: As for having a maximum and minimum, I'd check the input in the textfieldDelegate method textFieldDidEndEditing:.

Good luck! :)