NEW: Learn to build the incredible iOS 15 Weather app today! >>

SOLVED: Rock Scissor Paper. Project Crash.

Forums > 100 Days of SwiftUI


Hello I am doing Rock Paper Scissor project, I have an error, I dont know How to solve errors.

and is it possible to do it another way? I am having difficulty :( is there a way to code like rock beats scissor?

"Thread 1: EXC_BAD_ACCESS (code=2, address=0x16ae53fe0)"

import SwiftUI

struct ContentView: View {

    struct BlueButton: ButtonStyle {
        func makeBody(configuration: Configuration) -> some View {
                .background(Color(red: 0, green: 0, blue: 0.5))

    var options = ["Rock", "Paper","Scissors"]
    @State private var AIdecision: Int = Int.random (in: 0...2)
    @State private var yourFaith = Bool.random()
    @State private var Score: Int = 0
    @State private var user: Int = 0
    @State private var userDecision: Int = 0

    var goodAnswer: Int {
        if yourFaith == true {
            if AIdecision < user {
                return Score+1

            return Score+1
        return 0 

    var body: some View {
        VStack {

            Text("Your Score is \(Score)")


            Text("Computer has chosen '\(options[AIdecision])'. Do you want to win or lose?")
            Text("Your Faith has been decided. You\(yourFaith ? "Win" : "Lose")!!")


            HStack {
                Button("Rock") {
                    user = 0
                    print("User has chosen \(options[0])")

                    user = 1
                    print("User has chosen \(options[1])")


                Button("Scissors") {
                    user = 2
                    print("User has chosen \(options[2])")
            // end of View
        //end of content view


Right after your two Text elements, you have this line:


You forgot the leading .


in answer to your other question, have a look at my reply

You could use an enum to define the choices available.

enum choice {
    case rock, paper, scissors

Then following on from the other formnum quesition, define the condition for when the player wins (and similar one for when they need to lose the to get the points.)

func didWin(computer: choice, player: choice) -> Bool {
    switch computer {   // player wins with the choices below
    case .rock:
        return player == choice.paper
    case .paper:
        return player == choice.scissors
    case .scissors:
        return player == choice.rock


I would even go so far as to really fill out your enum:

enum Choice: Int {
    case rock
    case paper
    case scissors

    func random() -> Choice {
        Choice(rawValue: Int.random(in: 0...2))!

    var beatenBy: Choice {
        switch self {
        case .rock: return .paper
        case .paper: return .scissors
        case .scissors: return .rock

    var beats: Choice {
        switch self {
        case .rock: return .scissors
        case .paper: return .rock
        case .scissors: return .paper

    func wins(against otherChoice: Choice) -> Bool {
        otherChoice ==

    func loses(against otherChoice: Choice) -> Bool {
        otherChoice == self.beatenBy

That way, the game logic is all contained within the enum rather than being in the View, and it allows you to keep the logic in the View much simpler:

if userDecision.wins(against: aiDecision) {
    //player wins
} else {
    //AI wins

I find that more expressive and easier to understand and eaxch part of the code is only concerned with what it needs to be concerned with.



Thank you very much everyone I really appreciate.

I looked at your reply link. It looked very complicated for me :( . I need to practice more.


Hacking with Swift is sponsored by Sentry

SPONSORED With Sentry’s error and performance monitoring for iOS, you see mobile vitals that actually matter, can solve any latency issues quickly, and learn how each release is performing over time.

Learn More

Sponsor Hacking with Swift and reach the world's largest Swift community!

Reply to this topic…

You need to create an account or log in to reply.

All interactions here are governed by our code of conduct.

Unknown user

You are not logged in

Log in or create account

Link copied to your pasteboard.