How do you pop to root in SwiftUI NavigationStack?

WHAT THIS TESTS: The interviewer wants to know if you understand that SwiftUI navigation is data-driven, not imperative like UIKit. Specifically, they are checking whether you know that NavigationStack exposes a path binding that acts as the source of truth for the stack depth, and whether you can articulate how to manage that state across a view hierarchy without breaking the declarative model.

A GOOD ANSWER COVERS: First, the candidate should state that NavigationStack can be initialized with a binding to a NavigationPath or a typed array of hashable destinations. Second, they should explain that the owning state must live at or above the root view so it survives the lifetime of the pushed views, and that it is typically passed down via an ObservableObject view model or the environment rather than manual binding drilling. Third, they should describe the actual pop mechanism: resetting the bound path to an empty collection or calling removeLast to unwind partially, which causes SwiftUI to dismiss the intermediate views. Fourth, a strong answer notes that because the path is just data, deep links and state restoration become straightforward.

COMMON WRONG ANSWERS: A major red flag is suggesting UIKit interop such as finding the nearest UINavigationController and calling popToRootViewController. Another is proposing the legacy NavigationView pattern of using isActive bindings on NavigationLink, which does not scale and is not the idiomatic NavigationStack approach. Candidates who suggest dismissing via presentationMode or environment dismiss actions are also revealing a UIKit mental model that does not apply here.

LIKELY FOLLOW-UPS: The interviewer may ask how you would handle a heterogeneous stack where different destination types are pushed, which is where NavigationPath shines because it can hold any Hashable type without erasing type safety. They might also ask how to pop back a specific number of levels rather than all the way to root, which is answered by slicing the path array or calling removeLast repeatedly. Another common follow-up is how state restoration works, where the answer is simply persisting the path data to UserDefaults or similar and rehydrating it on launch.

ONE CONCRETE EXAMPLE: Imagine a root ContentView that owns a NavigationPath as State. It renders a NavigationStack bound to that path. Tapping a button appends a DetailRoute enum case to the path. A second tap appends another case. From the deepest view, a button in a toolbar calls a method on a shared NavigationModel that sets path.removeLast(path.count) or assigns NavigationPath() to clear the stack entirely, instantly returning the user to ContentView without any view controller gymnastics.