Most iOS applications begin as UIKit or storyboard-based projects with years of technical debt. A full rewrite to SwiftUI is often impractical and risky. The core principle is containment, not conversion—replacing edges one feature at a time. This approach avoids freezing development, breaking production, and rewriting everything twice.

Start migration by embedding SwiftUI inside UIKit using UIHostingController for isolated, leaf features like a ProfileView. This maintains existing navigation and app lifecycle while allowing incremental progress. ViewModels should remain framework-agnostic, shared between UIKit and SwiftUI to ensure business logic stays consistent. Define clear feature boundaries to prevent cross-contamination.

As more features migrate, gradually shift navigation to SwiftUI, eventually replacing UIKit host controllers. For legacy components like camera interfaces, use UIViewControllerRepresentable to host UIKit within SwiftUI. The strategy prioritizes local state migration over global AppState changes and ensures every step is reversible, shippable, and improves testability.