CAShapeLayer subview not animating correctly

Question

I am attempting to use CALayer for animations. What I want is the circle to shrink and bounce back (which works) and a stroked circle to expand and fade out like this. Unfortunately the second ring on the subLayer doesnt animate. I am not sure why.

I setup my layers like so

- (void)setLayerProperties {
    //The view’s Core Animation layer used for rendering.
    CAShapeLayer *layer = (CAShapeLayer *)self.layer;

    UIBezierPath *bezierPath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)
                                                      byRoundingCorners:UIRectCornerAllCorners
                                                            cornerRadii:self.frame.size];
    layer.path = bezierPath.CGPath;
    layer.fillColor = _Color.CGColor;

    rippleLayer = [[CAShapeLayer alloc] init]; // update from Andrea's answer
    layer.path = bezierPath.CGPath;
    layer.strokeColor = [UIColor blueColor].CGColor;
    [layer addSublayer:rippleLayer];
}

I then animate then using these functions

- (void)pop{
    CABasicAnimation *animation = [self animationWithKeyPath:@"transform.scale"];
    [animation setFromValue:[NSNumber numberWithFloat:1.0f]];
    [animation setToValue:[NSNumber numberWithFloat:0.8f]];
    [animation setRemovedOnCompletion:YES];
    [animation setDuration:0.15];
    [animation setAutoreverses:YES];

    [self.layer addAnimation:animation forKey:animation.keyPath];

    rippleLayer.anchorPoint = CGPointMake(1, 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];
    //r[scale setRemovedOnCompletion:YES];
    [scale setFillMode:kCAFillModeForwards];

    [rippleLayer addAnimation:scale forKey:scale.keyPath];
}

Answer 1

It seems that you are creating rippleLayer as a normal CALayer, not a CAShapeLayer. path is not a property of CALayer as far as I remember, and you are giving path to the same layer as before. So you are adding a simple layer with no content at all.