Switch for rock-paper-scissors - swift

Question

I'm trying to make a simple rock-paper-scissors game. To do it I used a switch statement but for some reason it doesn't work properly.
This is the structure I thought of to make this little game:
There are three buttons for Rock,Scissors,Paper, and you have to choose one.
There is a Label that tells what the opponent (computer) chose, and I named it opponentLabel.
There is a Label that tells what the result is ("you won" for example) and I named it resultLabel
and it works like this (this just the way it's structured):
var a = Int()
if the player chooses Rock ---> a = 0
if the player chooses Paper ---> a = 1
if the player chooses Scissors ---> a = 2
For the opponent (computer, not a person) there is a randomNumber which
could be 0,1,2, and same here, if 0->opponent chose rock, if
1->opponent chose paper, if 2-> opponent chose scissors
and then I wrote a switch statement that puts it all together.
The problem is that for some reason, when I run the app, if I choose rock everything works fine, but when I choose paper or scissors the results are wrong.
For example if I choose Paper (a = 1) and the opponent has paper (which means that the random number happened to be randomNumber = 1), the resultLabel is not "DRAW" as it would be supposed to be, but it is "You Lost": paper and scissors don't work !! What am I doing wrong?
Here is the full code:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var opponentLabel: UILabel!
#IBOutlet weak var resultLabel: UILabel!
#IBOutlet weak var rockButton: UIButton!
#IBOutlet weak var paperButton: UIButton!
#IBOutlet weak var scissorsButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
Hide()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func Hide() {
opponentLabel.hidden = true
resultLabel.hidden = true
}
func unHide() {
opponentLabel.hidden = false
resultLabel.hidden = false
}
var a = Int()
var randomNumber = Int()
func randomChoice() {
randomNumber = Int(arc4random() % 3)
NSLog("randomNumber%ld", randomNumber)
}
func gameOn() {
switch(randomNumber) {
case 0:
opponentLabel.text = "The opponent chose : ROCK"
if a == 0 {
resultLabel.text = "DRAW"
} else {
if a == 1 {
resultLabel.text = "YOU WON!"
}
if a == 2 {
resultLabel.text = "YOU LOST!"
}
}
unHide()
break
case 1:
opponentLabel.text = "The opponent chose: PAPER"
if a == 0 {
resultLabel.text = "YOU LOST!"
} else {
if a == 1 {
resultLabel.text = "DRAW"
}
if a == 2 {
resultLabel.text = "YOU WON!"
}
}
unHide()
break
case 2:
opponentLabel.text = "The opponent chose: SCISSORS"
if a == 0 {
resultLabel.text = "YOU WON!"
} else {
if a == 1 {
resultLabel.text = "YOU LOST!"
}
if a == 2 {
resultLabel.text = "DRAW"
}
}
unHide()
break
default:
break
}
}
#IBAction func rockButton(sender: AnyObject) {
a == 0
randomChoice()
gameOn()
}
#IBAction func paperButton(sender: AnyObject) {
a == 1
randomChoice()
gameOn()
}
#IBAction func scissorsButton(sender: AnyObject) {
a == 2
randomChoice()
gameOn()
}
}

Answer 1

In your #IBAction functions, you are comparing 'a' with 0, 1 or 2 instead of giving 'a' that value.
Change your code so instead of a == 0, it's a = 0. Do this for the 3 #IBActions and try it again and it should work.