2.4.2. User interface
An Action bar approach was emulated using icons, most of which
have two actions depending on whether they are pressed or held
down, this saves screen space and simplifies the interface. Whereas
menus in the Android application appear in a Dialog box, the iOS
application has a separate view, implemented by ECSlidingViewController [24] which slides in from the left. This view is populated
either with the available Cloud and local files or with the spectra
that can be selected (e.g. to annotate peaks)