xamarin.ios - How to draw a linear gradient along an arc in Xamarin iOS -

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I am trying to create a color picker device, similar to a color wheel, but in the shape of horse shoe

I have to draw a linear gradient that follows an arc.

Enter image details here

The problem

a) How to make a gradient to follow the curve, instead of just going in one direction, and

b) How to fill the stroke stroke and not surrounded by the area Arc

I have managed it on Android, but so far it has failed to work in iOS, so any advice is highly appreciated.


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