Animation with images when I click on it - ios

Question

I would like that when I click on the image, another image appears for 1 or 2 seconds.
I have two images (UIImage), one for pressed and another for unpressed.
Is it something like this? :
[UIView animateWithDuration: 0.2 delay: 0.0 options: UIViewAnimationOptionAutoreverse animations:^{
pressed.alpha = 1.0;
unPressed.alpha = 0.0;
}completion:^(BOOL finished){
pressed.alpha = 0.0;
unPressed.alpha = 1.0;
}];
But with that I can't see the pressed image.
Edit: My problem is to asign the image to the UIImageView I think, because when I click on it appear the pressed image but then the unPressed image not appear
I would like any similar to that:
[UIView animateWithDuration: 2.0 delay: 0.0 options: UIViewAnimationOptionAutoreverse animations:^{
pressed.alpha = 1.0;
unPressed.alpha = 0.0;
self.imageButton.image = pressed.image;
}completion:^(BOOL finished){
pressed.alpha = 0.0;
unPressed.alpha = 1.0;
self.imageButton.image = unPressed.image;
}];

Answer 1

First off, you set the animation duration to .2 so you may want to increase the duration to 1.0 or 2.0 if you in fact want it to show for 1 or 2 seconds.
Secondly, I'm assuming these images overlap one another, so when both alphas are 1, still only one of the images will be showing. Make sure unPressed is hidden before starting the animation; then make sure pressed is hidden after ending the animation.
unPressed.alpha = 0;
[UIView animateWithDuration: 2.0 delay: 0.0 options: UIViewAnimationOptionAutoreverse animations:^{
pressed.alpha = 1.0;
} completion:^(BOOL finished){
pulsando.alpha = 0.0;
pressed.alpha = 0.0;
unPressed.alpha = 1.0;
}];
(And one more question for you… You said you wanted the image to appear for 1 or 2 seconds. Did you want the image to just appear? Or did you want it to fade in? Just double checking… Because if you just want it to appear, you don't need the animation block.)
Edit: (In response to your edit)
Seems as if you don't need an animation block at all and that you're just trying to have the image appear for 2 seconds. In which case, when the button is pressed, show the image then hide the image after 2 seconds. For example:
- (IBAction)buttonSelected:(UIButton*)sender {
pressed.alpha = 1.0;
unPressed.alpha = 0.0;
[self performSelector:#selector(hidePressedImage) withObject:nil afterDelay:2.0];
}
- (void)hidePressedImage {
pressed.alpha = 0.0;
unPressed.alpha = 1.0;
}

Answer 2

Two images but three variables. Every time you run this function you will see the unPressed image + pressed image (and you will see the one that was added to the view at a later time, since it will be in front).

Answer 3

Maybe pressed image is overlapped by normal? Try following:
[UIView animateWithDuration: 0.2 delay: 0.0 options: UIViewAnimationOptionAutoreverse animations:^{
pressed.alpha = 1.0;
unPressed.alpha = 0.0;
}completion:^(BOOL finished){
pulsando.alpha = 0.0;
unPressed.alpha = 1.0;
pressed.alpha = 0.0;
}];