Loop animation - doesn't go - ios

Question

I'm trying to repeat a sequence of animations, inside a LOOP, changing at each loop some parameters randomly. Here is the code. Anyone please knows why it doesn't work?
If I call it once with a button action, it works, but with a loop it doesn't.
Thanks a lot! Giuseppe
-(IBAction)startLoop:(id)sender {
for (int i=1;i<10; i++) {
[self animation2];
}
}
-(id) animation2 {
int max=500;
UIImage *myImage = [UIImage imageNamed:#"coccinella2.png"];
CALayer *myLayer = [CALayer layer];
myLayer.contents = (id)myImage.CGImage;
myLayer.bounds = CGRectMake(0, 0, 50, 60);
[myLayer setPosition:CGPointMake(arc4random()%(max), arc4random()%(max))];
[myLayer setBounds:CGRectMake(0.0, 0.0, 50.0, 60.0)];
[self.view.layer addSublayer:myLayer];
//translation1
CGPoint startPt = CGPointMake(arc4random()%(max),arc4random()%(max));
CGPoint endPt = CGPointMake(arc4random()%(max),arc4random()%(max));
CABasicAnimation *transl1 = [CABasicAnimation animationWithKeyPath:#"position"];
transl1.removedOnCompletion = FALSE;
transl1.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
transl1.fromValue = [NSValue valueWithCGPoint:startPt];
transl1.toValue = [NSValue valueWithCGPoint:endPt];
transl1.duration = 2.0;
transl1.fillMode = kCAFillModeForwards;
transl1.beginTime = 0;
//scale 1
CABasicAnimation *scale1 = [CABasicAnimation
animationWithKeyPath:#"transform.scale"];
scale1.removedOnCompletion = FALSE;
[scale1 setToValue:[NSNumber numberWithInt:3]];
[scale1 setDuration:2.0f];
scale1.fillMode = kCAFillModeForwards;
scale1.beginTime = 0;
//rotation1
CABasicAnimation *rotation1 = [CABasicAnimation
animationWithKeyPath:#"transform.rotation.z"];
rotation1.removedOnCompletion = FALSE;
[rotation1 setFromValue:DegreesToNumber(0)];
[rotation1 setToValue:DegreesToNumber(90)];
//rotation1.repeatCount = HUGE_VALF;
[rotation1 setDuration:2.0f];
rotation1.fillMode = kCAFillModeForwards;
rotation1.beginTime = 0;
//group
CAAnimationGroup* group = [CAAnimationGroup animation];
[group setDuration: 6.0];
group.removedOnCompletion = FALSE;
group.fillMode = kCAFillModeForwards;
[group setAnimations: [NSArray arrayWithObjects:scale1, transl1, rotation1, nil]];
[myLayer addAnimation: group forKey: nil];
}

Answer 1

Your code doesn't repeat the annotation 10 times but starts 10 animations right away. If your goal is to start the animations after the previous one ended you should try using an NSTimer.

Answer 2

You can use an NSTimer to trigger each group of animations at a different time, or you can set the beginTime on each group, with code like this:
group.beginTime = CACurrentMediaTime() + delay;
For animations, using the beginTime gives more accurate timing, since CA is run on a separate thread and doesn't stall like NSTimers if your app gets busy.