Button with Tag

Question

How do I get a button with the a specifyed tag

id like to then cast it to a UIButton, and change the alpha

Answer 1

UIButton *button=(UIButton *)[self.view viewWithTag:tag];
button.alpha=0.5;

Answer 2

 UIView* view = [theViewContainingThatButton viewWithTag:tag];
 view.alpha = 0.5;

You don't need to cast the view to a UIButton to change its alpha. But you can add a (UIButton*) cast if really needed.