iOS: Is there any notification that Siri has appeared?

Question

I would like to receive a notification each time Siri appears or disappears from the screen.
It may appear when the user puts the iPhone near his ear.

Is it possible?

Answer 1

I ran a test and the following notifications are sent when Siri appears:

_UIApplicationWillAddDeactivationReasonNotification
UIApplicationWillResignActiveNotification

... and when Siri is dismissed:

_UIApplicationDidRemoveDeactivationReasonNotification
UIApplicationDidBecomeActiveNotification

So, no... since there isn't a public Siri API, and UIApplication doesn't send any Siri specific notifications, it looks like we're out of luck for now.

Answer 2

The only notification you'd get is a applicationDidEnterBackground (or something like that).

I don't think there are any Siri APIs at the moment so you would be looking at the OS as a whole.