I am creating apps which talk with web service and core data. i want to create sync class in swift. i dont where i can start. Can you please provide sample code for sync class.? And shared any ebooks related to that on email id - dkaplesh91@gmail.com

i am creating apps which talk with web service and core data. i want to create sync class in swift. i dont where i can start. Can you please provide sample code for sync class?. And shared any ebooks related to that on email id - dkaplesh91@gmail.com