CABasicAnimation originates from top right rather than center - ios

Question

I have a circle that I animate growing outwards and getting bigger. Unfortunately despite me setting the anchorPoint it doesnt animate from the center outwards, it seems to lock position top left. What is going on?
See this image that depicts the circles off center
Code
- (void)setLayerProperties {
rippleLayer = [[CAShapeLayer alloc] init];
rippleLayer.fillColor = [UIColor clearColor].CGColor;
rippleLayer.strokeColor = _Color.CGColor;
//rippleLayer.contentsGravity = #"center";
rippleLayer.anchorPoint = CGPointMake(0.5,0.5);
rippleLayer.bounds = self.bounds;
rippleLayer.path = bezierPath.CGPath;
[self.layer addSublayer:rippleLayer];
}
// Now animate the circle outwards
rippleLayer.opacity = 1;
CABasicAnimation *scale = [CABasicAnimation animationWithKeyPath:#"transform.scale"];
[scale setFromValue:[NSNumber numberWithFloat:1.0f]];
[scale setToValue:[NSNumber numberWithFloat:2.0f]];
[scale setRepeatCount:1];
[scale setDuration:1.0f];
//[scale setRemovedOnCompletion:YES];
[scale setFillMode:kCAFillModeForwards];
[rippleLayer addAnimation:scale forKey:scale.keyPath];

Answer 1

To scale layer at it's center, you need to set layer's position.This may help you
I want to draw a Smooth animations in iOS using CAPropertyAnimations
define RADIANS(angle) ((angle) / 180.0 * M_PI)
CGPoint testCenter = CGPointMake(144.5, 230.0);
CAShapeLayer *aTestLayer = [CAShapeLayer layer];
aTestLayer.path = [UIBezierPath bezierPathWithArcCenter:**CGPointZero** radius:15.0 startAngle:RADIANS(0) endAngle:RADIANS(360) clockwise:YES].CGPath;
aTestLayer.fillColor = [UIColor clearColor].CGColor;
aTestLayer.strokeColor = [UIColor whiteColor].CGColor;
**aTestLayer.position = testCenter;**
aTestLayer.borderWidth = 2.0;
[self.view.layer addSublayer:aTestLayer];
CABasicAnimation *pulse = [CABasicAnimation animationWithKeyPath:#"transform.scale"];
pulse.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
pulse.duration = 2;
pulse.repeatCount = HUGE_VALF;
pulse.autoreverses = YES;
pulse.fromValue = [NSNumber numberWithFloat:1.0];
pulse.toValue = [NSNumber numberWithFloat:2.0];
[aTestLayer addAnimation:pulse forKey:nil];