This simple test demonstrates that is in fact possible for various types of elements to receive focus, and for VoiceOver in iOS to announce that change in focus. There are two buttons below. The Search button should give focus to the search field, and the Menu button should give focus to the first focusable element in a list of menu items.
Having established that VoiceOver beautifully announces items as they receive focus, we move on to trying to replicate this performance when the target items are initially hidden. Please see the next test.