title: CABasicAnimation - Setting start stroke position
body: <p>I'm animating the drawing of a basic circle. This works fine, except the animation begins drawing at the 3 o'clock position. Does anyone know how I can make it start at 12 o'clock?</p>
  
  <pre><code>self.circle = [CAShapeLayer layer];
  self.circle.fillColor = nil;
  self.circle.lineWidth = 7;
  self.circle.strokeColor = [UIColor blackColor].CGColor;
  self.circle.bounds = CGRectMake(0, 0, 200, 200);
  self.circle.path = [UIBezierPath bezierPathWithOvalInRect:self.circle.bounds].CGPath;
  [self.view.layer addSublayer:self.circle];
  
  CABasicAnimation *drawAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
  drawAnimation.duration            = 5.0;
  drawAnimation.repeatCount         = 1.0;
  drawAnimation.removedOnCompletion = NO;
  drawAnimation.fromValue = [NSNumber numberWithFloat:0.0f];
  drawAnimation.toValue   = [NSNumber numberWithFloat:1.0f];
  drawAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
  [self.circle addAnimation:drawAnimation forKey:@"drawCircleAnimation"];
  </code></pre>