Make uibutton pulsate. - iphone

Question

I am trying to make a uibutton that has an image in it pulsate slowly by changing the alpha level back and forth once the view loads...
currently I am doing this but it does nothing....
-(void)loopdyloop
{
while ( myCount < 1000 )
{
[UIView animateWithDuration:3.0
delay:0.0f
options:UIViewAnimationCurveEaseOut
animations:^{
iconButton.alpha = 0.0;
} completion:^(BOOL finished) {
if (finished) {
NSLog(#"animated");
}
}];
[UIView animateWithDuration:3.0
delay:0.0f
options:UIViewAnimationCurveEaseOut
animations:^{
iconButton.alpha = 1.0;
} completion:^(BOOL finished) {
if (finished) {
NSLog(#"animated");
}
}];
myCount++;
}
}
this method is called from the viewdidload method,
pretty crude I know but its my best attempt, if you have any idea on how I could achieve this it would be greatly appreciated.

Answer 1

How about applying this in your button layer in viewDidLoad:
CABasicAnimation *pulseAnimation = [CABasicAnimation animationWithKeyPath:#"transform.scale"];
pulseAnimation.duration = .5;
pulseAnimation.toValue = [NSNumber numberWithFloat:1.1];
pulseAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
pulseAnimation.autoreverses = YES;
pulseAnimation.repeatCount = FLT_MAX;
[YOURButton.layer addAnimation:pulseAnimation forKey:nil];
and you can experiment with it.

Answer 2

If you want it to repeat forever you could add the animation options to auto reverse and repeat, like this:
[UIView animateWithDuration:3.0
delay:0.0f
options:UIViewAnimationCurveEaseOut |
UIViewAnimationOptionRepeat |
UIViewAnimationOptionAutoreverse
animations:^{
iconButton.alpha = 0.0;
}
completion:^(BOOL finished) {
// You could do something here
}];
It will cause the alpha to first animate to 0.0, then back to the original (1.0) and then do those two things over and over and over...