SwiftUI + UIKit in production
How to combine SwiftUI speed with UIKit escape hatches without creating a split-brain app architecture.
Pick ownership boundaries
SwiftUI and UIKit work well together when each layer has a clear job. Problems start when both frameworks try to own navigation, state, layout, and lifecycle at the same time.
For production apps, I prefer choosing boundaries intentionally: SwiftUI for fast product surfaces, UIKit for mature control points, and narrow bridges between them.
Keep state above the bridge
The framework boundary should not also become the source-of-truth boundary. State belongs somewhere explicit, then both UI systems can render from it.
That makes migrations less risky because screens can move between SwiftUI and UIKit without rewriting the product model every time.
Use UIKit without guilt
There are still places where UIKit is the right tool: custom text input, video timelines, scroll coordination, and precise layout control.
The trick is to use it deliberately, not apologetically.