CODEWITHSUNDEEP
iosswiftuibutton
Sergey
Sergey

Reputation: 37

UIButton.setTitle does not set UIButton.titleLabel.text to empty string

It is not a problem but I found out that UIButton.setTitle does not set UIButton.titleLabel.text to "". So if you want to set UIButton.titleLabel.text to "" you should use UIButton.titleLabel.text = "" after UIButton.setTitle("", for: .normal).

In playground it looks like:

import UIKit

let button = UIButton()
button.setTitle("1", for: .normal)
print(button.titleLabel?.text ?? "no value")
//print 1
button.setTitle("2", for: .normal)
print(button.titleLabel?.text ?? "no value")
//print 2
button.setTitle("3", for: .normal)
print(button.titleLabel?.text ?? "no value")
//print 3
button.setTitle("", for: .normal)
print(button.titleLabel?.text ?? "no value")
//print 3 not ""
button.titleLabel?.text = ""
print(button.titleLabel?.text ?? "no value")
//print ""

But of course button.titleLabel?.text = "" works only after button.setTitle("", for: .normal)

button.setTitle("3", for: .normal)
button.titleLabel?.text = ""
print(button.titleLabel?.text ?? "no value")
//print 3

I do not understand why this works this way. Perhaps someone can explain why?

Upvotes: 1

Views: 599

Answers (1)

Sagar Chauhan
Sagar Chauhan

Reputation: 5823

You can see following apple description regarding button title set. See the red marked rectangle.

Sender is instance of UIButton

enter image description here

As per apple documentation:

To set the actual text of the label, use setTitle(_:for:).

button.titleLabel.text does not let you set the text.

I hope this will help you.

Upvotes: 3

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