title: EXC_BAD_ACCESS while using CoreAnimation
body: <p>I use CoreAnimation to animate UIImageView (curve Bezier animation). Here`s my code:</p>
  
  <pre><code>CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
  pathAnimation.calculationMode = kCAAnimationCubic;
  pathAnimation.fillMode = kCAFillModeForwards;
  pathAnimation.removedOnCompletion = NO;
  
  CGPoint endPoint = originalPosition;
  
  UIBezierPath *path = [UIBezierPath bezierPath];
  [path moveToPoint:star.layer.position];
  [path addQuadCurveToPoint:endPoint controlPoint:CGPointMake(star.layer.position.x, endPoint.y)];
  
  pathAnimation.path = path.CGPath;
  
  [star.layer addAnimation:pathAnimation forKey:@"moveToScorebarAnimation"];
  </code></pre>
  
  <p>As a result, I get <strong>EXC_BAD_ACCESS (code=2, address=0x0)</strong> with stacktrace:</p>
  
  <pre><code>CoreGraphics`CG::Path::apply(void*, void (*)(void*, CGPathElementType, CGPoint const*)) const:
  0x613c06:  pushl  %ebp
  0x613c07:  movl   %esp, %ebp
  0x613c09:  subl   $24, %esp
  0x613c0c:  movl   8(%ebp), %eax
  0x613c0f:  movl   (%eax), %ecx
  0x613c11:  movl   (%ecx), %eax
  0x613c13:  movl   16(%ebp), %edx
  0x613c16:  movl   %edx, 8(%esp)
  0x613c1a:  movl   12(%ebp), %edx
  0x613c1d:  movl   %edx, 4(%esp)
  0x613c21:  movl   %ecx, (%esp)
  0x613c24:  calll  *64(%eax)
  0x613c27:  addl   $24, %esp
  0x613c2a:  popl   %ebp
  0x613c2b:  ret  
  </code></pre>
  
  <p>I tried to use different manuals to do it, but app crashes the same way. Can't understand where`s my fault. Any help will be appreciated, thanks.</p>
  
  <p>P. S. Here's a similar <a href="https://github.com/Inferis/ViewDeck/issues/221" rel="nofollow">bug</a>, but unfortunately it is solved just by removing animation.</p>
  
  <p>P. P. S. Arc is enabled. Also, if I comment <em>pathAnimation.path = path.CGPath;</em> line, crash does not appear, as well as animation (what is not surprised :) ).</p>