Last month, I was building an iOS app that needed to parse user input into structured data without sending anything to the cloud. The traditional approach would've involved complex regex patterns or third-party APIs. Then I discovered Apple's Foundation Models framework and its @Generable macro — and everything changed. Photo by Daniil Komov on Pexels The @Generable macro is Apple's Swift-native solution for generating structured output from on-device language models. It's part of the Foundation Models framework introduced at WWDC 2026, and it's fundamentally changing how we build AI-powered iOS apps. Instead of wrestling with unstructured text responses from LLMs, you can now define Swift types and let the system generate perfectly formatted data. Table of Contents What is the @Generable Macro? Setting Up Foundation Models @Generable Macro Implementation Advanced Use Cases Performance Analysis Best Practices Frequently Asked Questions What is the @Generable Macro?…