PulsatingAnimation

-(void)startPulsatingAnimation {
    if (!self.shouldPulsate) {return;}
    [self removePulsingAnimation];
    CABasicAnimation *theAnimation=[CABasicAnimation animationWithKeyPath:OpacityAnimationKey];
    theAnimation.duration = 1.0;
    theAnimation.repeatCount = HUGE_VALF;
    theAnimation.autoreverses = YES;
    theAnimation.fromValue = [NSNumber numberWithFloat:1.0];
    theAnimation.toValue = [NSNumber numberWithFloat:0.0];
    [self.layer addAnimation:theAnimation forKey:PulsingAnimation];
}