ibireme/YYKit ? reverse-engineered prompt

Build me an iOS utility library that feels like part of the system, with a clean set of reusable components for common app work.

I want it to include things like fast model mapping from JSON, image loading and decoding, rich text support, keyboard handling, async drawing, queue management, and a bunch of handy Foundation and UIKit helpers. It should be usable through one main import, but also work well as separate pieces if someone only wants part of it. Please include a small demo app that shows the main features in action, especially text, images, and a social style feed or compose screen.

Make it easy to install with common iOS dependency tools, and keep it compatible with older iOS versions if possible. If you need to check current docs or best practices while building it, look them up online.