Questions about Apple’s VoiceOver guidelines for iOS developers

App Development

Are there any good design guidelines for VoiceOver for iOS developers?

Apple's developer docs mostly cover elements that a developer can use to enable controls to be spoken by VoiceOver. However, it only provides design heuristics related to those elements (e.g. how to label a button and not use too many words).

For instance, I have a general question right now: "Should you announce the title of a new screen upon arriving there and any pertinent current state or let the user find out on their own?"