Maintaining a Swift and Objective-C Hybrid Codebase - Shopify

This post details strategies for maintaining a hybrid Swift and Objective-C codebase in mobile applications. It covers ensuring interoperability through nullability annotations, leveraging the `@objc` attribute for granular bridging control, wrapping Swift-only types in NSObject subclasses, and using Swift extensions to add Objective-C-visible methods and categories. The goal is to enable the adoption of Swift for new development while continuing to support and integrate with existing Objective-C code.