Argthtjtr

I am trying to display, using a UILabel, the time/date (Date or NSDate), formatted using a DateFormatter of each previous app launch when I start the app.

So, every time I launch the app there should be another date that is displayed on the screen.

For example, if this is the first time launching, it will display Nov 18 2018, 13:15. And the second launch it should display

Nov 18 2018, 13:15 

Nov 18 2018, 13:16

The third launch it should display something like

 Nov 18 2018, 13:15 

 Nov 18 2018, 13:16

 Nov 18 2018, 13:17

Currently, my code only displays the time of the launch but does not record previous launches. If anyone can give me some directions on how to use UserDefaults to achieve this I will really appreciate it!

import UIKit



class ViewController: UIViewController {



    @IBOutlet weak var Timelabel: UILabel!



    override func viewDidLoad() {

        super.viewDidLoad()

        let dateFormatterPrint = DateFormatter()

        dateFormatterPrint.dateFormat = "MMM dd, yyyy HH:mm:ss"



        let DisplayTime: Date = Date()

        print(dateFormatterPrint.string(from: DisplayTime))

        Timelabel.text = "Current Time: (dateFormatterPrint.string(from: DisplayTime))"



    }



}

Use it as following

class ViewController: UIViewController {



    // your other @IBOutlet / properties

    let ARR_KEY = "launch_time"



    override func viewDidLoad() {

        // your other code.

        // remove your TimeLabel.text = ... line



        let formattedDateTime = dateFormatterPrint.string(from: DisplayTime)





        // storing the launch date time

        if var arr = UserDefaults.standard.stringArray(forKey: ARR_KEY){

            arr.append(formattedDateTime)

            UserDefaults.standard.set(arr, forKey: ARR_KEY)

        } else {

            UserDefaults.standard.set([formattedDateTime], forKey: ARR_KEY)       

        }



        displayLaunchTimeInSimpleLabel()

    }



    func displayLaunchTimeInSimpleLabel() {

        if var arr = UserDefaults.standard.stringArray(forKey: ARR_KEY){

               var string = ""

               for launchTime in arr {

                   string = string + launchTime + "n"

               }

               Timelabel.text = string

         }

    }

}