How to detect if a textfield is empty in swift?

Question

Hello despite the question name, this question requests a bit more insight.

I want to know how to check if a textfield is empty but it must be able to detect this if contained text previously.

Here is my current code

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

    if textField == txtSitReach {

        if txtSitReach.text != nil {

            doneSitReachButton.enabled = true
        }
        else {
            doneSitReachButton.enabled = false
        }
    }
    else {
        print("whatever")
    }

no that solution invoked some very odd behavior. Essentially that did not work. — T Race
– T Race, Commented Jun 23, 2016 at 22:52

Eendje · Accepted Answer · 2016-06-23 23:06:43Z

4

You could add a target checking the textfield when some changes has been made (i.e. adding some characters).

txtSitReach.addTarget(self, action: #selector(textDidChange), forControlEvents: .EditingChanged)

func textDidChange(textField: UITextField) {
    doneSitReachButton.enabled = txtSitReach.text?.isEmpty ?? false
}

answered Jun 23, 2016 at 23:06

Eendje

8,8931 gold badge31 silver badges31 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

T Race Over a year ago

This is so close! It does the opposite of what I want though. When the textfield is empty it is enabled and when it has text it is disabled

Eendje Over a year ago

You can add a ! in front of txtSitReach.text?.isEmpty to do the opposite though. It wasn't very clear what you exactly wanted in your question :).

Code · Accepted Answer · 2016-06-24 04:10:05Z

2

Fixing the other answer:

txtSitReach.addTarget(self, action: #selector(textDidChange), forControlEvents: .EditingChanged)

func textDidChange(textField: UITextField) {
    doneSitReachButton.enabled = !txtSitReach.text!.isEmpty
}

answered Jun 24, 2016 at 4:10

Code

6,2414 gold badges38 silver badges78 bronze badges

1 Comment

Eendje Over a year ago

Nothing big, but you could have just edited my question and added the !. Now there are two "exact" the same answers, which could confuse other people. Just a tip for next time ;).

Collectives™ on Stack Overflow

How to detect if a textfield is empty in swift?

2 Answers 2

2 Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related