How to use Optional Ints in a Switch statement

I have made some progress on my app to play RoShambo, but am stumped on one particular thing. In one ViewController, I have established two properties of the class. I want them to be integers because I use a switch statement later on in the class with integers. However, I get an error when I use integers saying:

"Class 'ResultsViewController' has no initializers"
"stored property 'your play' without initial value prevents synthesized initializers"

Now, those errors go away if I make my stored properties optionals, but then I get errors on my switch statement because it uses integers, not optionals.

So I have two questions: 1) In the switch statement I have below, how would I use values of type "Int?" in a switch statement?

2) If my optional values are nil, how could I end the program and not conduct the switch statement, since it wouldn't make sense to conduct the comparison?

import Foundation
import UIKit

class ResultsViewController: UIViewController {

// MARK: Properties

var opponentPlay: Int?
var yourPlay: Int?

//Mark: Outlets

@IBOutlet weak var MatchResult: UILabel!
@IBOutlet weak var PlayAgainButton: UIButton!


//Mark: Life Cycle

     override func viewWillAppear(_ animated: Bool){
        //unwrap optional properties
        if let opponentPlay = opponentPlay {
            print("good play")
        } else {
            print("opponentPlay is nil")

        }

        if let yourPlay = yourPlay {
            print("good play")
        } else {
            print("opponentPlay is nil")
        }


    switch (opponentPlay, yourPlay) {
        case (1, 1), (1, 1), (2, 2), (2, 2), (3, 3), (3, 3):
            self.MatchResult.text = "You Tie!"
        case (1, 2):
            self.MatchResult.text = "You Win!"
        case (2, 1):
            self.MatchResult.text = "You Lose!"
        case (1, 3):
            self.MatchResult.text = "You Lose!"
        case (3, 1):
            self.MatchResult.text = "You Win!"
        case (2, 3):
            self.MatchResult.text = "You Win!"
        case (3, 2):
            self.MatchResult.text = "You Lose!"
        default:
            break
    }