MVVM interview questions SwiftUI

MVVM is the default answer many candidates give, so interviewers probe whether you apply it thoughtfully or reflexively.

MVVM in a SwiftUI context

The view model holds presentation state and logic, exposing observable properties the view renders and methods the view calls, which keeps the view declarative and the logic unit testable. With Observation, a view model is often an @Observable class the view owns via @State, replacing the older ObservableObject and @Published approach.

When MVVM is too much

Be honest that SwiftUI already provides state management, so a trivial view does not need a view model, and forcing one everywhere adds ceremony. Explain that you reach for a view model when a screen has real logic, side effects, or dependencies worth testing in isolation. Knowing when not to use MVVM is what separates a senior answer.

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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.

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Frequently asked

Does every SwiftUI view need a view model?

No. Simple views can use SwiftUI's own state tools directly. Introduce a view model when a screen has real logic, side effects, or dependencies worth testing.

Where does MVVM put testable logic?

In the view model, which exposes observable state and methods without importing UI, so you can unit test behavior independent of the view.