Animate views(layers) using CAKeyframeAnimation in a loop and CAAnimationGroup - ios

Question

I am trying to animate several views (layers) using CAKeyframeAnimation and CAAnimationGroup. Each view to be animated is contained in an array. My idea is to loop through the array where CAKeyframeAnimation instance of each view would be added to an array of animations, which then would be added to the CAAnimationGroup. My goal is to animate each view one after another. As far as I understand I need to use the group in order to have a reference for the beginTime.
I am probably missing something obvious, but my code doesn't work
CAAnimationGroup *cardAnimationGroup = [CAAnimationGroup animation];
cardAnimationGroup.delegate = self;
cardAnimationGroup.removedOnCompletion = NO;
cardAnimationGroup.beginTime = 0.0f;
[cardAnimationGroup setValue:#"animation0" forKey:#"id"];
cardAnimationGroup.duration = 1.2f * [_myViewsArray count];
NSMutableArray *animationsArray = [[NSMutableArray alloc] init];
// Loop through views
for (UIView *cardView in _myViewsArray)
{
NSUInteger index = [_myViewsArray indexOfObject:cardView];
// my target origin
CGFloat yOffset = (-(cardView.frame.origin.y - _middleCardView.frame.origin.y) - index * 2);
CAKeyframeAnimation *translateCardPositionAnimation = [CAKeyframeAnimation animationWithKeyPath:#"transform.translation.y"];
translateCardPositionAnimation.removedOnCompletion = YES;
//translateCardPositionAnimation.fillMode = kCAFillModeForwards;
translateCardPositionAnimation.beginTime = 1.2f * index;
translateCardPositionAnimation.duration = 1.2f;
translateCardPositionAnimation.values = [NSArray arrayWithObjects:
[NSNumber numberWithFloat:0.0f],
[NSNumber numberWithFloat:yOffset],
[NSNumber numberWithFloat:yOffset],nil];
translateCardPositionAnimation.keyTimes = [NSArray arrayWithObjects:
[NSNumber numberWithFloat:0.0f],
[NSNumber numberWithFloat:1.0f],
[NSNumber numberWithFloat:1.2f], nil];
[_containerCardView addSubview:cardView];
[_containerCardView sendSubviewToBack:cardView];
[animationsArray addObject:translateCardPositionAnimation];
[cardView.layer addObject:translateCardPositionAnimation forKey:#"id"];
if (index == [_myViewsArray count]-1) {
[cardAnimationGroup setAnimations:animationsArray];
}
}