UIButton title disappears

Question

I have a ViewController with an UIButton inside. When I clicked, the text on the button disappeared. I add all the setTitle for all states, but it continues disappearing. An

Answer 1

I noticed a peculiar thing. If I set the title using

  bttn.titleLabel.textColor = [UIColor purpleColor];

Then as soon as I click the button, the title disappears. But, if I use the following method :

[bttn setTitleColor:[UIColor purpleColor] forState:UIControlStateNormal];

Then everything is working correctly.