Generative UI using Foundation Model in iOS 26. I love how the UI changes realtime as the streaming response updates.

Working with large amounts of data in FM is tricky due to the limited context window. Tool calling makes it manageable but still requires a lot of tweaking. On the bright side, it’s fully on-device & free.

Got a lot of DMs about details. It’s not true gen UI in sense that the LLM does not generate SwiftUI code. The context window is too small for that. I had to build a mapper for a limited number of SwiftUI components (charts, stacks, labels, etc) the LLM chooses & builds UI.

Scan any documents, convert images into text, PDF files, etc. 👍

Very cool! Share more!

Repo link please

This is built for one of my apps @FinmaMoney But you can check out Apple’s official sample code, it has a nice example of this.

this is the future. sick!

It sure is! Apple has made implementing generative UI really simple. Expect many more apps to offer a chat experience with fully native SwiftUI views.

As more iOS apps integrate this on device model, do you expect it to impacy battery life?

Yes I do. I expect Apple to rate limit the API and even make it unavailable when temps are high.

generative ui is cool, but watch out for the limits. on-device is great, but real-time updates can drain the battery fast if overused. keep it light and efficient.