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Use

Structure:-

I used the MVVM structure with use cases to cleanly achieve separation of concern for the user interface from the application logic. By using this architecture it helped in

Independent of UI: The UI can change easily, without changing the rest of the system as we can substitute the table view with a collection view and we will not have to touch our logic
Independent of the database and network: I can easily change them without breaking business rules.
Testable: The business rules can be tested without the UI, database, web server, or any other external element.

Data Flow

View(UI) calls a method from ViewModel.
ViewModel executes Use Case.
Use Case call network API and return the articles to viewModel.
Information flows back to the View(UI) where we display the list of items.

Caching:-

I used UserDefauls to cache simple configuration(user favorites and date of last caching)
I used documents directory to cache articles and refresh it every 15 minutes:

When thinking about persistence in iOS apps:

The first choice might be Core Data but Core Data is best used when we have a lot of relationships between our objects as it is primarily an object graph manager that happens to have a persistence layer, our second choice might be realm but in our case, the overhead work is not worth it so saving a .plist file to disk allows us to easily add, remove our model objects without much code and the code is more swift friendly and it’s easy to understand