I would store application state in a atomic reference, and have "time" be updated every second by a timer. I would add a watch to the application state, so that

I would store application state in a atomic reference, and have "time" be updated every second by a timer. I would add a watch to the application state, so that every time application state changes, the UI is re-drawn. At least that's how I do most UI-apps in ClojureScript (re-draw auto magically when state changes). You'd do the same in Clojure-for-iOS. Of course, since you rely on Apples SDK for UI, you would use interop to subclass whatever needs subclassing, but the principle remains the same.