Why is UIAccessibility.post(notification: .announcement, argument: “arg”) not announced in voice over?

Question

When using Voice Over in iOS, calling UIAccessibility.post(notification:argument:) to announce a field error doesn\'t actually announce the error.

I have a

Answer 1

This is an admittedly hacky solution, but I was able to prevent the system announcement from pre-empting my own by dispatching to the main thread with a slight delay:

DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
  UIAccessibility.post(notification: .announcement, argument: "")
}