Can I animate the radial gradient in the iPhone?

Question

I would like to animate the radial gradient in order to compress and increase the inner radius, as if it were pulsating.

Now I am showing the gradient using CGGradient, but I'm not sure how to animate it. I saw this topic

Can you change the gradients using Quartz in iPhone?

This explains how to animate a linear gradient using CAGradientLayer, but it doesn't seem to lead to a radial gradient.

Is there an easy way to animate a CGGradient or somehow create a radial gradient of a CAGradientLayer?

Any thoughts are appreciated.

Answer 1

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CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"transform"];
[anim setFromValue:[NSValue valueWithCATransform3D:CATransform3DIdentity]];
// Scale x and y up
[anim setToValue:[NSValue valueWithCATransform3D:
                CATransform3DMakeScale (1.0f, 1.0f,0.0f)]];
[anim setAutoreverses:YES];
[anim setRepeatCount:HUGE_VALF];

[[gradientView layer] addAnimation:anim];

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, - . Core Animation /. , , (, innerRadius), -drawLayerInContext. , , . , , , .

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