Detect a user logout on macOS - objective-c

Question

I am currently tryting to detect a user logout in macOS 10.14 (Mojave). I found this, which was working in the past:
Catching Logoff (not power off) event on MAC using objective C
The code I use is:
NSAppleEventManager* m = [NSAppleEventManager sharedAppleEventManager];
NSAppleEventDescriptor* desc = [m currentAppleEvent];
switch ([[desc attributeDescriptorForKeyword:kAEQuitReason] int32Value])
{
case kAELogOut:
case kAEReallyLogOut:
// log out
break;
case kAEShowRestartDialog:
case kAERestart:
// system restart
break;
case kAEShowShutdownDialog:
case kAEShutDown:
// system shutdown
break;
default:
// ordinary quit
break;
}
But the value I get is always zero (0).
Did something change in Mojave or is there another mechanism? This code is called in the applicationShouldTerminate function in my AppDelegate.

Answer 1

It's still available and it works (just tested on macOS Big Sur), but the value is in the enumCodeValue property.
func applicationShouldTerminate(_ sender: NSApplication) -> NSApplication.TerminateReply {
let reason = NSAppleEventManager.shared()
.currentAppleEvent?
.attributeDescriptor(forKeyword: kAEQuitReason)
switch reason?.enumCodeValue {
case kAELogOut, kAEReallyLogOut:
print("Logout")
return .terminateNow
case kAERestart, kAEShowRestartDialog:
print("Restart")
return .terminateNow
case kAEShutDown, kAEShowShutdownDialog:
print("Shutdown")
return .terminateNow
case 0:
// `enumCodeValue` docs:
//
// The contents of the descriptor, as an enumeration type,
// or 0 if an error occurs.
print("We don't know")
return .terminateNow
default:
print("Cmd-Q, Quit menu item, ...")
return .terminateNow
}
}