Limit picker to not accept a date lesser than today

DatePickerRange.swift

// DatePicker.swift
// DatePicker Limit
// Author: Dede
// E-mail: dede.exe@gmail.com

import UIKit
import PlaygroundSupport

var str = "Hello, playground"

class DatePickerViewController : UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = UIColor.white
        createDatePicker()
    }
    
    func createDatePicker() {
        let datePicker = UIDatePicker()
        datePicker.frame.origin.x = 0.0
        datePicker.frame.origin.y = 0.0
        datePicker.addTarget(self, action: #selector(changeValue), for: UIControlEvents.valueChanged)
        datePicker.datePickerMode = .date
        self.view.addSubview(datePicker)
    }
    
    
    @IBAction func changeValue(sender: UIDatePicker)
    {
        
        //Get time Now, and convert to a NSCalendar
        //Specify the minimun date if you want.
        let now = Date()
        let nowCalendar = Calendar.current
        let nowComponents = nowCalendar.dateComponents([.day, .month, .year], from: now)

        //Compare if date is lesser than now and then create a new date
        if nowCalendar.compare(sender.date, to: now, toGranularity: Calendar.Component.day) == ComparisonResult.orderedAscending
        {
            var dateCalendar = Calendar.current
            var dateComponents = dateCalendar.dateComponents([.day, .month, .year], from: sender.date)

            guard let year = nowComponents.year else { return }
            
            dateComponents.year = year + 1
            let newDate = dateCalendar.date(from:dateComponents)
            sender.date = newDate!
        }
    }
}


let viewController = DatePickerViewController()
PlaygroundPage.current.liveView = viewController