title: How to get position during animation which uses CALayer and CGPath in iPhone
body: <pre><code> hI,
  
   I am workng on animation using CALayer and CAPath.
  
   Here I am animating an Image from top to bottom of screen.I gave starting and ending position for
   the animation.Now, I want to get position  during the animation.
  
  Sample Code:
  
     - (void)onTimer
      {
  
      CGImageRef imageRef = [[UIImage imageNamed:@"apple.png"] CGImage];
  int startX                      = round(random() % 460);
  double speed     = 1 / round(random() %100) + 1.0;
  
  layer          = [CALayer layer];
  layer.name              = @"layer";
  layer.contents          = (id)imageRef; // cached image
  layer.frame             = CGRectMake(startX, self.view.frame.size.height+10,    CGImageGetWidth(imageRef), CGImageGetHeight(imageRef));
  
  [mView.layer addSublayer:layer];
  
  
   path = CGPathCreateMutable(); 
  CGPathMoveToPoint(path, NULL, startX, -100);
  CGPathAddLineToPoint(path, NULL, startX, self.view.frame.size.height+10);
  
  
  
  CAKeyframeAnimation *animation= [CAKeyframeAnimation animationWithKeyPath:@"position"];
  
  animation.delegate=self;
  
  animation.duration= 10*speed;
  animation.autoreverses=NO;
  animation.path=path;
  animation.repeatCount = 0;
  animation.removedOnCompletion=YES;
  animation.calculationMode = kCAAnimationLinear;
  
  [layer addAnimation:animation forKey:@"position"];
  
  
  CGPoint point= CGPathGetCurrentPoint(path);
  
  
     }
  
      In this I used "CGPathGetCurrentPoint" method but it did not work. Also used 
       presentationLayer method of CALayer but uit also did not work in this case.
  
       Can anyone suggest the code to get the position during animation
      thanks in advance
  </code></pre>