The Challenge of Legacy Code

Migrating a massive banking application from UIKit to SwiftUI is no small feat. It requires a balanced approach to ensure stability while embracing the modern declarative UI paradigm.

Incremental Adoption

We adopted a strangler fig pattern for our UI layer:

1. New Features: All net-new screens are built exclusively in SwiftUI.
2. Hybrid Wrappers: We utilize UIHostingController extensively to embed SwiftUI views within existing UIKit hierarchies.
3. Component Library: We rebuilt our core design system in SwiftUI first, ensuring consistency across both paradigms.

By prioritizing incrementality, we minimized risk while delivering a smoother user experience.

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