Delay an animation – Objective-C - iphone

Question

I am using the following code to animate a circle. However, it is constantly blinking. I want to delay the restart of the animation by 5 seconds. How can I do that?
-(void)start
{
[self removeExistingAnimation];
//create the image
UIImage* img = [UIImage imageNamed:#"redCircle.png"];
imageView = [[UIImageView alloc] initWithImage:img];
imageView.frame = CGRectMake(0, 0, 0, 0);
[self addSubview:imageView];
//opacity animation setup
CABasicAnimation *opacityAnimation;
opacityAnimation=[CABasicAnimation animationWithKeyPath:#"opacity"];
opacityAnimation.duration = ANIMATION_DURATION;
opacityAnimation.repeatCount = ANIMATION_REPEAT;
//theAnimation.autoreverses=YES;
opacityAnimation.fromValue = [NSNumber numberWithFloat:0.6];
opacityAnimation.toValue = [NSNumber numberWithFloat:0.025];
//resize animation setup
CABasicAnimation *transformAnimation;
transformAnimation = [CABasicAnimation animationWithKeyPath:#"transform.scale"];
transformAnimation.duration = ANIMATION_DURATION;
transformAnimation.repeatCount = ANIMATION_REPEAT;
//transformAnimation.autoreverses=YES;
transformAnimation.fromValue = [NSNumber numberWithFloat:MIN_RATIO];
transformAnimation.toValue = [NSNumber numberWithFloat:MAX_RATIO];
//group the two animation
CAAnimationGroup *group = [CAAnimationGroup animation];
group.repeatCount = ANIMATION_REPEAT;
[group setAnimations:[NSArray arrayWithObjects:opacityAnimation, transformAnimation, nil]];
group.duration = ANIMATION_DURATION;
//apply the grouped animaton
[imageView.layer addAnimation:group forKey:#"groupAnimation"];
}

Answer 1

Do it like this :
-(void)start
{
[self removeExistingAnimation];
//create the image
UIImage* img = [UIImage imageNamed:#"redCircle.png"];
imageView = [[UIImageView alloc] initWithImage:img];
imageView.frame = CGRectMake(0, 0, 0, 0);
[self addSubview:imageView];
[self doAnimation];
[NSTimer scheduledTimerWithTimeInterval:5.0 target:self selector:#selector(doAnimation) userInfo:nil repeats:YES];
}
-(void)doAnimation
{
//opacity animation setup
CABasicAnimation *opacityAnimation;
opacityAnimation=[CABasicAnimation animationWithKeyPath:#"opacity"];
opacityAnimation.duration = ANIMATION_DURATION;
opacityAnimation.repeatCount = ANIMATION_REPEAT;
//theAnimation.autoreverses=YES;
opacityAnimation.fromValue = [NSNumber numberWithFloat:0.6];
opacityAnimation.toValue = [NSNumber numberWithFloat:0.025];
//resize animation setup
CABasicAnimation *transformAnimation;
transformAnimation = [CABasicAnimation animationWithKeyPath:#"transform.scale"];
transformAnimation.duration = ANIMATION_DURATION;
transformAnimation.repeatCount = ANIMATION_REPEAT;
//transformAnimation.autoreverses=YES;
transformAnimation.fromValue = [NSNumber numberWithFloat:MIN_RATIO];
transformAnimation.toValue = [NSNumber numberWithFloat:MAX_RATIO];
//group the two animation
CAAnimationGroup *group = [CAAnimationGroup animation];
group.repeatCount = ANIMATION_REPEAT;
[group setAnimations:[NSArray arrayWithObjects:opacityAnimation, transformAnimation, nil]];
group.duration = ANIMATION_DURATION;
//apply the grouped animaton
[imageView.layer addAnimation:group forKey:#"groupAnimation"];
}
This is look like dirty method but worked for me , hop it help you..

Answer 2

Isn't this a bit cleaner? Or is there a reason why you can't use blocks for animating?
- (void) start {
//create the image
UIImage* img = [UIImage imageNamed:#"redCircle.png"];
imageView = [[UIImageView alloc] initWithImage:img];
[self addSubview:imageView];
[self animateWithDelay:0.0];
}
- (void) animateWithDelay:(CGFloat)delay {
imageView.alpha = 0.0;
imageView.transfrom = CGAffineTransformScale(myImage.transform, MIN_RATIO, MIN_RATIO);
[UIImageView animateWithDuration:ANIMATION_DURATION delay:delay options:0 animations:^{
imageView.alpha = 1.0;
imageView.transfrom = CGAffineTransformScale(myImage.transform, MAX_RATIO, MAX_RATIO);
} completion:^{
animationCount++;
if (ANIMATION_REPEAT != animationCount) {
[self animateWithDelay:5.0];
}
}];
}
You should define animationCount somewhere in your class, so you know when he should stop repeating.
(Not tested, so could contain some errors)