iOS animation with duration and autoreverse - ios

Question

I am animating an UIImageView with the UIView block API. My animation fades the UIImageView In and Out continuously. How can I animate this only for a specific time duration ?
I have put up this piece of code
float tempDuration = 5.0;
[UIView animateWithDuration:tempDuration
delay:0
options:UIViewAnimationOptionAutoreverse | UIViewAnimationOptionAllowUserInteraction
animations:^{
_imageView.alpha = 1;
}
completion:nil];

Answer 1

First of all allow me to introduce an article that is awesome to understand some features of the animations:
Controlling Animation Timming
In this article you have a part that shows what you want.
You want something like this:
Therefore you can configure that in the following way:
-(void) animateImageView:(UIImageView*) imageView
withDuration:(int) duration
withRepeatCount: (int) repeatCount {
CABasicAnimation *opacityAnim = [CABasicAnimation animationWithKeyPath:#"opacity"];
opacityAnim.fromValue = #1.0;
opacityAnim.toValue = #0.0;
opacityAnim.autoreverses = YES;
opacityAnim.duration = duration/2.0/repeatCount;
opacityAnim.removedOnCompletion = YES;
opacityAnim.repeatCount = repeatCount;
[imageView.layer addAnimation:opacityAnim forKey:nil];
}
This way you guarantee that your animation will always be 5 seconds and you can tune in the number of repetitions.

Answer 2

Maybe you could try CABasicAnimation instead if [UIView animateWithDiration: ... ]
it should be something like this:
CABasicAnimation *opacityAnim = [CABasicAnimation animationWithKeyPath:#"opacity"];
opacityAnim.fromValue = [NSNumber numberWithFloat:1.0];
opacityAnim.toValue = [NSNumber numberWithFloat:0.0];
opacityAnim.autoreverses = YES;
opacityAnim.duration = duration;
opacityAnim.removedOnCompletion = YES;
opacityAnim.repeatCount = 5;
[imageView.layer addAnimation:opacityAnim forKey:nil];

Answer 3

You can do the following changes to do your work.
- (void)animateImageView{
static int animcount = 1;
float tempDuration = 1.0;
[UIView animateWithDuration:tempDuration
delay:0
options: UIViewAnimationOptionAutoreverse
animations:^{
self.imgView.alpha = 1;
}
completion:^(BOOL finished) {
if(finished && animcount<5){
animcount+=1;
[self animateImageView];
}
else if (finished && animcount==5){
[self.imgView.layer removeAllAnimations];
}
}];
}