Having problems allowing interaction in UIView animation

Question

I have the following block of code to fade out an introView(UIView)

// Hide intro view after 5 seconds
[UIView animateWithDuration: 1.0
          delay: 5.0
         


        

Answer 1

I had the same problem with a button that I animated with changing the alpha. Cueing off VinceBurn's answer...

What you see on the screen during the animation is not what the application sees. The moment >you set your alpha to 0, the alpha is 0 for that view, even if you are still seeing it on the >screen. AND view that have an alpha lower that 0.05 (don't recall the exact number) won't get touch >event.

… the simple solution of just making the minimum alpha 0.1 instead of 0.0 worked for me:

[UIView animateWithDuration:0.5
                          delay:0.0
                        options:UIViewAnimationOptionCurveEaseInOut | UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse | UIViewAnimationOptionAllowUserInteraction
                     animations:^{
                         self.myButton.alpha = 0.1f;
                     }
                     completion:^(BOOL finished){
                     }]

Button registered the touchUpInside all the time with no additional method needed, and there was virtually no difference in appearance from taking the alpha to zero.