Monitoring lock / unlock on macOS.

screenlockMonitor.swift

// import Foundation;
import UserNotifications;
let dnc = DistributedNotificationCenter.default();
let lockObserver = dnc.addObserver(forName: .init("com.apple.screenIsLocked"), object: nil, queue: .main) { _ in
	print("lock");
	exit(0);
};
let unlockObserver = dnc.addObserver(forName: .init("com.apple.screenIsUnlocked"), object: nil, queue: .main) { _ in
	print("unlock");
	exit(0);
};
RunLoop.main.run();