When you add a new feature to an existing iOS app, you often have to choose between SwiftUI and UIKit. Both are supported, and most apps use a mix of the two. The question is which one suits this feature.
Choose SwiftUI when
- The screen is mostly content and simple interaction.
- You want the design to adapt across iPhone, iPad and other platforms.
- The team is comfortable with declarative code and has the tooling set up.
Choose UIKit when
- The screen depends on a complex, existing UIKit component.
- You need fine control over custom animation, gestures or collection layouts.
- The feature must integrate tightly with older code that is hard to wrap.
Keep the boundary clean
Whichever you choose, keep a clear boundary between UI and business logic. A feature that is well separated can move from UIKit to SwiftUI later with much less effort.