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When I try to set a CAShapeLayers FillColor property to null I get a null ref exception. According to Apples documentation I should be able to do this.
The same issue occurs when setting the Path property of CAShapeLayer.
I suspect this is an issue with a lot of the CoreGraphics namespace as a lot of the property setters use value.Handle without a null check on value.
A workaround is to do the following:
ShapeLayer.FillColor = new CGColor(IntPtr.Zero)
ShapeLayer.Path = new CGPath(IntPtr.Zero)
Fixed in 8029651 (master). This fix will be included in the first 5.3 release.
It will also be included in 5.2.6.
Verified Fixed in 5.2.6