I'm using ScrollComponent to create a scrollable list within my prototype. I've used ScrollComponent.contentInset to 'hide' the top item in the list.
Using this method, I'm not able to create something that represents a 'hidden' button that can be revealed and stuck in place once dragged out and fully exposed (i.e. the search bar in Apple's Mail.app for iOS). I previously hacked something together using the .draggable method on the ScrollComponent's superLayer (before the ScrollComponent was introduced), but that didn't let me tuck the top item under another layer.