Xcode Countdown for days until Christmas

Question

I'm looking for a possibility in Xcode to get a label count town the days until Christmas. I tried to count down the days with the NSDate Foundation but didn't achieve a solution :(

This countdown is a present or someone and I appreciate every example code from you!

Thanks in advance! Benjamin

The code I tried was from a older video but didn´t work out for me... Can someone tell me why and how I can fix it?

Code:

import UIKit

class StartViewController: UIViewController {

@IBOutlet weak var dateLabelOutlet: UILabel!

let formatter = DateFormatter()

let userCalendar = NSCalendar.current

let requestedComponents: NSCalendar.Unit = [
    NSCalendar.Unit.Month,
    NSCalendar.Unit.Day,
    NSCalendar.Unit.Hour,
    NSCalendar.Unit.Minute,
    NSCalendar.Unit.Second
]

func printTime(){
    formatter.dateFormat = "MM/dd/yy hh:mm:ss a"
    let startTime = NSDate()
    let endTime = formatter.date(from: "12/24/18 12:00:00 a")

    let timeDifference = userCalendar.dateComponents(requestedComponents, from: startTime, to: endTime!, options: [])     
    }
}

Answer 1

This method calculates and prints the number of days from today until next Christmas

func printDays() {
    // create date components of 12/24
    let xmasComponents = DateComponents(month: 12, day: 24)
    // get next occurrence 
    let nextXmas = Calendar.current.nextDate(after: Date(), matching: xmasComponents, matchingPolicy: .strict)!
    // calculate number of days
    let daysUntilXmas = Calendar.current.dateComponents([.day], from: Date() , to: nextXmas).day!
    print("Christmas is in \(daysUntilXmas) days")
}