Detecting if the user is typing?

Question

For a UITextField, what is the best way to detect if the user is typing and the textfield has a value?

I've tried the following unsuccessfully:

Value Changed: no response
Editing Did End: no response
Touch Up Inside: doesn't trigger until after the user clicks out of the textfield

I think your question has already been answered here: http://stackoverflow.com/questions/7010547/uitextfield-text-change-event — MLyck, Mar 22 '15 at 16:08
This works better: http://stackoverflow.com/questions/27916943/how-to-not-allow-the-user-to-enter-a-value-more-than-190-in-uitextfield. — 4thSpace, Mar 22 '15 at 16:27

score 2 · Answer 1 · answered Mar 22 '15 at 17:21

Try using the shouldChangeCharactersInRange event.

func textField(textField: UITextField, 
           shouldChangeCharactersInRange range: NSRange, 
           replacementString string: String) 
 -> Bool {
  // Put your code here
}

This is called whenever a user adds or removes a new character to your UITextField.

If you want to accept the change, return true. Otherwise return false.

Just make sure your UITextField conforms to the UITextFieldDelegate Protocol

Detecting if the user is typing?

1 Answers1