Fade-In Fade-Out Animation for UIImageViews? - iphone

Question

I have two UIImageView - leftSide and rightSide, which I would like to fade in and then fade out, one after the other, in a loop.
How do I do this in Xcode? I tried CABasicAnimation but this did not work (I'm not sure why, no errors at all, the images do not fade).
Thanks!
EDIT: This is the code I was using:
-(void)leftSideFade{
CABasicAnimation *blink;
blink = [CABasicAnimation animationWithKeyPath:#"opacity"];
blink.duration = 1.0;
blink.repeatCount = 5;
blink.autoreverses = YES;
blink.fromValue = [NSNumber numberWithFloat:1.0];
blink.toValue = [NSNumber numberWithFloat:0.0];
[leftSideStart.layer addAnimation:blink forKey:#"animateOpacity"];
[self rightSideFade];
}
-(void)rightSideFade{
CABasicAnimation *blink;
blink = [CABasicAnimation animationWithKeyPath:#"opacity"];
blink.duration = 1.0;
blink.repeatCount = 5;
blink.autoreverses = YES;
blink.fromValue = [NSNumber numberWithFloat:1.0];
blink.toValue = [NSNumber numberWithFloat:0.0];
[rightSideStart.layer addAnimation:blink forKey:#"animateOpacity"];
[self leftSideFade];
}

Answer 1

- (void)fadeIn
{
[UIView beginAnimations:#"fadeIn Animation" context:nil];
[UIView setAnimationDuration:1.0];
imageView.alpha = 1.0;
[UIView commitAnimations];
}
Try this to.

Answer 2

Try using the following :
- (void) fadeinRightFadwOutLeft {
[UIView beginAnimations:#"start" context:nil];
[UIView setAnimationDuration:1.0];
rightSide.alpha = 0.0;
leftSide.alpha = 1.0;
[UIView commitAnimations];
}
- (void) fadeinLeftFadwOutRight {
[UIView beginAnimations:#"start" context:nil];
[UIView setAnimationDuration:1.0];
leftSide.alpha = 0.0;
rightSide.alpha = 1.0;
[UIView commitAnimations];
}

Answer 3

How about a simpler way with UIView animateWithDuration:animations:completion: ?
There you just change alpha of your views and they will fade in/out
Here is a sample code:
[UIView animateWithDuration:duration
animations:^
{
//Here you set values you want to see in the end of animation
leftView.alpha = 0.0f;
rightView.alpha = 1.0f;
}
completion:^(BOOL finished)
{
//something to do after animation finished
}