gistfile1.swift

import UIKit
import os.signpost

class ViewController: UIViewController {

    let label = UILabel()
    let viewDidLoadOSLog = OSLog(subsystem: "com.uptech.TestProject", category: .pointsOfInterest)

    override func viewDidLoad() {
        super.viewDidLoad()
        // some code here
        os_signpost(.begin, log: viewDidLoadOSLog, name: "viewDidLoad")
        // some code here
        setupUI()
        someWeirdFunc()
        os_signpost(.end, log: viewDidLoadOSLog, name: "viewDidLoad")
        // some code here
    }


    func setupUI() {
        view.addSubview(label)
        label.text = ""
    }


    func someWeirdFunc() {
        for value in 0...9999 { label.text! += "\(value)" }
        label.sizeToFit()
        label.center = CGPoint(
            x: view.frame.size.width  / 2,
            y: view.frame.size.height / 2
        )
    }

}