Simplifying Apple Watch/iOS App Communication with Racket Macros

Developing an Apple Watch app involves handling communication with its iOS counterpart. The author uses Racket macros to define a Domain Specific Language (DSL) that auto-generates Swift code to handle the complexities of the WatchConnectivity framework, including message encoding, decoding, and message handler implementation. This avoids a lot of boilerplate code, improving maintainability and reliability. By defining message types and handlers, the DSL automatically generates Swift enums, structs, functions for sending messages, and a message handling protocol, greatly simplifying the development process.