ViewController.swift

//
//  ViewController.swift
//  timertestswift
//
//  Created by Paul Wilkinson on 2/3/17.
//  Copyright © 2017 Paul Wilkinson. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var label: UILabel!
    @IBOutlet weak var countDownLabel: UILabel!
    
    let dateFormatter = DateFormatter()
    
    var targetTime: Date!
    
    var timer: Timer?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        let targetTime = Date().addingTimeInterval(120)
        
        let calendar = Calendar.current
        
        var components = calendar.dateComponents([.day, .month, .year, .hour, .minute, .second, .nanosecond], from: targetTime)
        components.setValue(0, for: .second)
        self.targetTime = calendar.date(from: components)
        
        
        self.timer = Timer.scheduledTimer(withTimeInterval: 0.5, repeats: true, block: { (timer) in
            
          
            
            self.updateLabel()
            
        })
        
        self.dateFormatter.timeStyle = .long
        self.dateFormatter.dateStyle = .short
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    func updateLabel() {
        let now = Date()
        self.label.text = self.dateFormatter.string(from: now)
        let timeRemaining = round(self.targetTime.timeIntervalSince(now))
        if timeRemaining > 0 {
            self.countDownLabel.text = "\(timeRemaining)"
        } else {
            self.countDownLabel.text = "0"
        }
    }


}