Animation in for loop compounds everytime view appears - objective-c

Question

I am trying to get a fresh set of random animations each time the view loads, but instead I am getting the animations multiplying and leading to the inevitable application meltdown! Any help on how to get a fresh start each time the view appears
- (void)startAnimation
{
int n;
for (n=0; n<150; n++){
UIBezierPath *bubblePath = [UIBezierPath bezierPath];
[bubblePath moveToPoint:P(arc4random()%768, arc4random()%1024)];
[bubblePath addCurveToPoint:P(arc4random()%768, arc4random()%1024)
controlPoint1:P(arc4random()%768, arc4random()%1024)
controlPoint2:P(arc4random()%768, arc4random()%1024)];
CALayer *bubble = [CALayer layer];
bubble.bounds = CGRectMake(0, 0, 10.0, 10.0);
bubble.position = CGPointMake(arc4random()%768, arc4random()%1024);
bubble.contents = (id)([UIImage imageNamed:#"Bubble.png"].CGImage);
[self.view.layer addSublayer:bubble];
CAKeyframeAnimation *bubbleAnim = [CAKeyframeAnimation animationWithKeyPath:#"position"];
bubbleAnim.path = bubblePath.CGPath;
bubbleAnim.rotationMode = kCAAnimationRotateAuto;
bubbleAnim.duration = 100;
bubbleAnim.repeatCount = HUGE_VALF;
[bubble addAnimation:bubbleAnim forKey:#"bubble"];
}
int i;
for (i=0; i<8; i++){
UIBezierPath *tinyPath = [UIBezierPath bezierPath];
[tinyPath moveToPoint:P(arc4random()%400+840, arc4random()%75+125)];
[tinyPath addCurveToPoint:P(-400, arc4random()%75+150)
controlPoint1:P(arc4random()%450, arc4random()%200+250)
controlPoint2:P(arc4random()%300, arc4random()%200+150)];
CALayer *tinyFish = [CALayer layer];
tinyFish.bounds = CGRectMake(0, 0, 150.0, 150.0);
tinyFish.position = CGPointMake(868, 800);
tinyFish.contents = (id)([UIImage imageNamed:#"Fish3.png"].CGImage);
[self.view.layer addSublayer:tinyFish];
CAKeyframeAnimation *tinyAnim = [CAKeyframeAnimation animationWithKeyPath:#"position"];
tinyAnim.path = tinyPath.CGPath;
tinyAnim.rotationMode = kCAAnimationRotateAuto;
tinyAnim.duration = 15;
tinyAnim.repeatCount = HUGE_VALF;
[tinyFish addAnimation:tinyAnim forKey:#"fish"];
}
}

Answer 1

[UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationCurveLinear animations:^
{
//do your animations here
}completion:^(BOOL finished)
{
//remove all layers here. Eventually add here another animation where you fade out all layers and in that animation's completion block remove them from the view
}];
Hope this helps. Cheers!