Future Day Calculator

ViewController.swift

//
//  ViewController.swift
//  DaysUntilDate
//
//  Created by Scotty Moon on 8/31/14.
//  Copyright (c) 2014 Scotty Moon. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
                            
    @IBOutlet weak var monthTextField: UITextField!
    @IBOutlet weak var dayTextField: UITextField!
    @IBOutlet weak var yearTextField: UITextField!
    @IBOutlet weak var resultLabel: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        setDefaultValues()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    @IBAction func setDefaultValues() {
        var calendar = NSCalendar(identifier: NSGregorianCalendar)
        var currentDate = calendar.components(
            NSCalendarUnit.CalendarUnitDay |
                NSCalendarUnit.CalendarUnitMonth |
                NSCalendarUnit.CalendarUnitYear,
            fromDate: NSDate.date())
        
        
        if monthTextField.text.isEmpty {
            monthTextField.text = String(currentDate.month)
        }
        
        if dayTextField.text.isEmpty {
            dayTextField.text = String(currentDate.day)
        }
        
        if yearTextField.text.isEmpty {
            yearTextField.text = String(currentDate.year)
        }
        
        resultLabel.text = ""
    }

    @IBAction func calculateFutureDays(sender: AnyObject) {
        setDefaultValues()
        
        var futureDateComponents = NSDateComponents()
        futureDateComponents.day = dayTextField.text.toInt()!
        futureDateComponents.month = monthTextField.text.toInt()!
        futureDateComponents.year = yearTextField.text.toInt()!
        
        var calendar = NSCalendar(identifier: NSGregorianCalendar)
        var futureDate = calendar.dateFromComponents(futureDateComponents)
        var currentDate = NSDate.date()
        
        var durationDateComponents = calendar.components(NSCalendarUnit.CalendarUnitDay,
            fromDate: currentDate,
            toDate: futureDate!,
            options: nil)
        
        var numberOfDaysUntilFutureDate = durationDateComponents.day
        
        var numberFormatter = NSNumberFormatter()
        numberFormatter.usesGroupingSeparator = true
        
        var dayString = numberFormatter.stringFromNumber(numberOfDaysUntilFutureDate)
        
        
        resultLabel.text = "Only \(dayString) days to go!"
    }

}