Fluent UI's robust, up-to-date iOS controls are built with Swift and are compatible with Objective-C. Look through the control list to see the building blocks that are available using Fluent UI Apple.
First, check the Fluent UI Apple issue queue to see if your component has already been requested or is being worked on. If you don't see an existing issue for the component you're looking for, please file an issue in the repo. If we're already working on it, we'll let you know. If it's new to our list, we'll keep you posted.