I am trying to implement DDD pattern in swift. Do anyone have any example or any GitHub link from where I can check.
Thanks in advance.
Domain Driven Design - DDD is a concept, if you are familiar with the concept then implementing the same is no different in Swift than any other language like Java. Since, you brought the topic i am going to assume that you are familiar with the principles of DDD as covered by Eric Evans in his book Domain Driven Design, another good book is Clean Architecture by Robert C. Martin.
If you are looking to see how to define classes (Domain objects - Single Responsibility Principle), interfaces (Dependency Inversion Control) then check the videos on OOP at the below link. Check the ones marked OOP directly.
You can start at: OOP - Classes and Objects - YouTube