title: How to fill color outside the circle on google map using Swift?
body: <p>I want the red circle just have the border (no red in centre) and have the rest outside the circle darkened?</p>
  
  <p>I have a issue about that. Could you help me solve it?</p>
  
  <p><a href="https://i.stack.imgur.com/rza3i.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rza3i.jpg" alt="My screen"></a></p>