A viewcontroller to get last event time on the system

ViewController.swift

//
//  ViewController.swift
//
//  Created by Sufiyan Yasa on 19/03/2020.
//  Copyright © 2020 Sufiyan Yasa. All rights reserved.
//

import Cocoa
import CoreGraphics

class ViewController: NSViewController {

    var timer: Timer?

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        print("hi there")

    }

    override func viewDidAppear() {
        self.timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(fireTimer), userInfo: nil, repeats: true)
    }
    override func viewDidDisappear() {
        self.timer?.invalidate()
    }

    @objc func fireTimer() {
        let anyEventTypeInput = CGEventType(rawValue: ~0)!
        let count = CGEventSource.counterForEventType(.combinedSessionState, eventType: anyEventTypeInput)
        let seconds = CGEventSource.secondsSinceLastEventType(.combinedSessionState, eventType: anyEventTypeInput)
        print("found count \(count) seconds since \(seconds)")
    }

    override var representedObject: Any? {
        didSet {
        // Update the view, if already loaded.
        }
    }


}