CAShapeLayer_Animation.m

- (id)init{
	
	self = [super init];
	
	if (self)
	{
		self.frame = CGRectMake(0, 0, 100, 100);
		self.backgroundColor = [UIColor clearColor];
		self.opaque = NO;
	}
	
	return self;
}

- (void)layoutSubviews
{
    [self setLayerProperties];
    [self attachAnimations];
}

- (void)setLayerProperties
{
    CAShapeLayer *layer = (CAShapeLayer *)self.layer;
    layer.path = [UIBezierPath bezierPathWithOvalInRect:self.bounds].CGPath;
    layer.fillColor = [UIColor colorWithHue:0 saturation:1 brightness:.8 alpha:1].CGColor;
}

- (void)attachAnimations
{
    [self attachPathAnimation];
    [self attachColorAnimation];
}

- (void)attachPathAnimation
{
    CABasicAnimation *animation = [self animationWithKeyPath:@"path"];
    animation.toValue = (id)[UIBezierPath bezierPathWithOvalInRect:CGRectInset(self.bounds, 40, 40)].CGPath;
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    [self.layer addAnimation:animation forKey:animation.keyPath];
}

- (void)attachColorAnimation
{
    CABasicAnimation *animation = [self animationWithKeyPath:@"fillColor"];
    animation.fromValue = (id)[UIColor colorWithHue:0 saturation:.9 brightness:.9 alpha:1].CGColor;
    [self.layer addAnimation:animation forKey:animation.keyPath];
}

- (CABasicAnimation *)animationWithKeyPath:(NSString *)keyPath
{
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:keyPath];
    animation.autoreverses = YES;
    animation.repeatCount = HUGE_VALF;
    animation.duration = 1;
    return animation;
}

+ (Class)layerClass
{
	return [CAShapeLayer class];
}