Find if user is in a call or not?

Question

I wanted to see if a user was using the application and to see if they were in a phone call or not. I was following this link to see check if a user was in a phone call or n

Answer 1

Or, shorter (swift 5.1):

private var isOnPhoneCall: Bool {
    return CXCallObserver().calls.contains { $0.hasEnded == false }
}