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.