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MVC vs MVVM interview question iOS
MVC versus MVVM is a pattern-comparison classic. A mature answer avoids tribalism and focuses on what each buys you.
What each pattern does
Apple's MVC splits model, view, and controller, but in practice the view controller often absorbs view, presentation, and glue logic, producing the massive view controller problem. MVVM adds a view model that holds presentation state and logic, so the controller or SwiftUI view stays thin and the logic becomes unit testable in isolation.
Choosing with judgment
Explain that MVVM's main win is testability and a slimmer view layer, at the cost of some extra types, while MVC is lighter for simple screens. The senior answer is that the pattern is a means to manage complexity and dependencies, so you choose per screen and avoid dogma. SwiftUI's data flow already nudges you toward an MVVM-like separation.
Go deeper than a summary
Share Your Screen works topics like this through in full: 75 solved Swift problems with tests, 9 real case studies, and 7 annotated mock interviews, so you rehearse the live round instead of just reading about it.
Frequently asked
What problem does MVVM solve over MVC?
It moves presentation state and logic out of the view controller into a testable view model, addressing the massive view controller problem and improving testability.
Is MVVM always better than MVC?
No. MVVM adds types that a trivial screen does not need. Choose per context: MVC for simple views, MVVM where testable presentation logic earns its keep.