Duncan Champney, an old friend, has released some iOS code demonstrating how to convert a multipoint Polygon into a Round Corner Polygon.

Duncan Champney  an old friend, has released some iOS code demonstrating how to convert a multipoint Polygon into a Round Corner Polygon.

This common graphic operation is not available in any iOS/Mac SDK, so this is great resource for anyone who design this type of interface.

https://github.com/DuncanMC/RoundedCornerPolygon

Stack Overflow posting regarding code: https://stackoverflow.com/questions/67051677/how-do-i-draw-irregular-polygons-with-a-mix-of-rounded-and-sharp-corners/