I was almost on the point of asking about this, but I found a solution, and I
wanted to put it into Google in case anyone else runs into it.
I had a CAShapeLayer that I had simply filled with a flat color. I decided to
try for a gradient fill because Everything is Better with Gradients.
CAShapeLayer doesn't do gradients, so I had to combine it with a masked
CAGradientLayer.
My first attempt looked like this
* Create a CALayer subclass to contain the shape and the gradient.
* Create a CAShapeLayer (shapeL) with my original shape.
- Fill it with clearColor so the gradient would show through.
- Stroke it with blackColor.
* Create the gradient layer (gradL).
- Set startPoint, endPoint, frame, colors, etc.
* Create a duplicate CAShapeLayer (maskL) with [[CAShapeLayer alloc]
initWithLayer: shapeL].
- Adjust the fill color to blackColor, because masking goes by alpha.
* Set gradL.mask to maskL, so the gradient will be clipped to the shape.
* Add gradL and shapeL to self.
- Add a shadow to self because Everything is Also Better with Shadows.
The container layer drew only shapeL. Nothing I could do with the mask, the
gradient, or the shape did any good. However, not setting gradL.mask at all did
draw the gradient (as a rectangle).
The trick was that -initWithLayer: did not produce a usable mask layer. If I
created maskL as a new mask layer ([CAShapeLayer layer]), and initialized it to
match shapeL (except for the fill), gradL was drawn as expected.
<http://stackoverflow.com/questions/4733966/applying-a-gradient-to-cashapelayer>
got me most of the way, but didn't extend to how to re-use the mask layer.
— F
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