Accessing variables in other ViewControllers Swift 3 - ios

Question

I have a problem I can't seem to solve myself, I have two view controllers, the first one contains three variables that stores integers. On my second view controller I have 3 sliders which manipulates a label under each slider with a number.
I want the numbers from these 3 sliders to replace the numbers that were set in the three variables on my first view controller when I click a button on the second view controller but when I when I type in the variable name it doesn't show up in the second view controller?
Can somebody explain what I may be doing wrong as I thought the variables were public and globally accessible throughout my app but I'm struggling to figure out what I'm doing wrong.
Here is some of my code:
import UIKit
import AVFoundation
class ViewController: UIViewController {
var timer = Timer()
var softTime = 180
var mediumTime = 300
var hardTime = 600
var chosenTime = 0
I want softTime, mediumTime & hardTime to be changed from the button in the next view controller:
import UIKit
class SettingsViewController: UIViewController {
#IBOutlet weak var softLabel: UILabel!
#IBOutlet weak var softSliderValue: UISlider!
#IBAction func softSlider(_ sender: Any) {
let currentValue = Int(softSliderValue.value)
softLabel.text = "\(currentValue)"
}
#IBOutlet weak var mediumLabel: UILabel!
#IBOutlet weak var mediumSliderValue: UISlider!
#IBAction func mediumSlider(_ sender: Any) {
let currentValue = Int(mediumSliderValue.value)
mediumLabel.text = "\(currentValue)"
}
#IBOutlet weak var hardLabel: UILabel!
#IBOutlet weak var hardSliderValue: UISlider!
#IBAction func hardSlider(_ sender: Any) {
let currentValue = Int(hardSliderValue.value)
hardLabel.text = "\(currentValue)"
}
#IBAction func setTimesButton(_ sender: Any) {
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
}

Answer 1

//in Second VC
protocol PassDataDelegte: class {
func your method(first: String, second: String, third: String)
}
weak var delegate: PassDataDelegte?
func youction button() {
delegate?.yourmethod(first, timeString: second, third: date)
}
// in First VC
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "DeadlineSegue" {
let dvc = segue.destinationViewController as! YourSecondViewController
dvc.delegate = self
}
}
extension YourFirstViewController: PassDataDelegte {
func sendDateTime((first: String, second: String, third: String) {
print(first)
print(second)
print(third)
}