I had a tough time with project 4. I tried to make it as pleasing to the eye as possible but I was so stuck on getting buttons to work and getting the logic right was right I had no steam left to make the app look pretty.

//
//  ContentView.swift
//  PaperRockScissorsProj4

import SwiftUI

struct ContentView: View
{

    let possibleMoves = ["🗒️", "🪨", "✂️"]
    let possibleWinMoves = ["🗒️", "🪨", "✂️"]
    @State private var currentChoice = ""
    @State private var currentChoiceNumber = 0
    @State private var winOrLose = false
    @State private var appCurrentChoice = ""
    @State private var appCurrentChoiceNumber = 0
    @State private var shouldWin = true
    @State private var shouldWindToggle = false
    @State private var computerSelected = false
    @State private var score = 0

    var body: some View
    {
        NavigationView
        {
            ZStack(alignment: .top)
            {
                AngularGradient(gradient: Gradient(colors: [.black, .blue, .black, .black, .black]), center: .center)
                    .ignoresSafeArea()
                ZStack
                {
                    VStack
                    {
                        Text("Paper, Rock, Scissors")
                            .foregroundStyle(.white)
                            .font(.largeTitle)
                        Spacer()
                        Text("Select Paper Rock Scissors")
                            .foregroundStyle(.white)
                            .font(.title)
                            .shadow(color: .yellow, radius: 10)
                            .shadow(color: .yellow, radius: 25)

                        Spacer()
                        HStack
                        {
                            Spacer()
                            ForEach(0..<3)
                            { number in
                                Button(possibleMoves[number])
                                {
                                    currentChoiceNumber = number
                                    currentChoice = possibleMoves[currentChoiceNumber]
                                    print(currentChoice)
                                    selectMove()
                                    print(appCurrentChoice)
                                    playerScore()
                                    computerSelected = true
                                }
                                .buttonStyle(BorderlessButtonStyle())
                                Spacer()
                            }
                        } .font(.system(size: 50))
                        Spacer()
                        Spacer()

                        Section
                        {
                            Text("Your selection is \(currentChoice)")
                                .prominentMyText()
                            Spacer()
                            Text("Player's score \(score)")
                                .prominentMyText()

                            Spacer()

                            Text(computerSelected ? "Computer selection is \(appCurrentChoice)" : "Waiting for computer selection")
                                .prominentMyText()
                            Spacer()
                            Text(shouldWin ? "Should win" : "Should lose")
                                .prominentMyText()
                        }
                    }
                }
            }
        }
    }

    func moveTapped(_ number: Int)
    {
        currentChoice = possibleMoves[number]
        print(currentChoice)
    }

    func selectMove()
    {

        appCurrentChoiceNumber = Int.random(in: 0..<possibleMoves.count)

        appCurrentChoice = possibleMoves[appCurrentChoiceNumber]

        if shouldWindToggle
        {
            shouldWin.toggle()
        }
        else
        {
            shouldWin = Bool.random()
            shouldWindToggle = true
        }

    }
    func playerScore()
    {

        if (currentChoiceNumber == appCurrentChoiceNumber) && shouldWin
        {
            print("Tie but should win")
            print("currentChoice \(currentChoiceNumber)\(currentChoice) and appCurrentChoice \(appCurrentChoiceNumber)\(appCurrentChoice)")
            score += 0
        } //Tie but should win
        else if (currentChoiceNumber == appCurrentChoiceNumber) && shouldWin == false
        {
            print("Tie but should lose")
            print("currentChoice \(currentChoiceNumber)\(currentChoice) and appCurrentChoice \(appCurrentChoiceNumber)\(appCurrentChoice)")
            score += 0
        } //Tie but should lose
        else if (currentChoiceNumber == 0 && appCurrentChoiceNumber == 1 || currentChoiceNumber == 1 && appCurrentChoiceNumber == 2 || currentChoiceNumber == 2 && appCurrentChoiceNumber == 0) && shouldWin == false
        {

            score -= 1
            print("Win but should lose")
            print("currentChoice \(currentChoiceNumber)\(currentChoice) and appCurrentChoice \(appCurrentChoiceNumber)\(appCurrentChoice)")
        } // Win but should lose
        else if (currentChoiceNumber == 0 && appCurrentChoiceNumber == 1 || currentChoiceNumber == 1 && appCurrentChoiceNumber == 2 || currentChoiceNumber == 2 && appCurrentChoiceNumber == 0) && shouldWin == true
        {

            score += 1
            print("Win but should win")
            print("currentChoice \(currentChoiceNumber)\(currentChoice) and appCurrentChoice \(appCurrentChoiceNumber)\(appCurrentChoice)")
        } // Win but should win
        //        let possibleMoves = ["🗒️", "🪨", "✂️"]
        //        let possibleWinMoves = ["🗒️", "🪨", "✂️"]
        else if (currentChoiceNumber == 0 && appCurrentChoiceNumber == 2 || currentChoiceNumber == 1 && appCurrentChoiceNumber == 0 || currentChoiceNumber == 2 && appCurrentChoiceNumber == 1) && shouldWin == false
        {
            score += 1
            print("Lose but should lose")
            print("currentChoice \(currentChoiceNumber)\(currentChoice) and appCurrentChoice \(appCurrentChoiceNumber)\(appCurrentChoice)")
        } //Lose but should lose

        else if (currentChoiceNumber == 0 && appCurrentChoiceNumber == 2 || currentChoiceNumber == 1 && appCurrentChoiceNumber == 0 || currentChoiceNumber == 2 && appCurrentChoiceNumber == 1) && shouldWin
        {
            score -= 1
            print("Lose but should win")
            print("currentChoice \(currentChoiceNumber)\(currentChoice) and appCurrentChoice \(appCurrentChoiceNumber)\(appCurrentChoice)")
        } //Lose but should win

    }
    /*let possibleMoves = ["🗒️", "🪨", "✂️"]
    let possibleWinMoves = ["🪨", "✂️", "🗒️"]*/
}

struct MyText: ViewModifier
{
    func body(content: Content) -> some View
    {
        content
            .foregroundStyle(.white)
            .font(.largeTitle)
            .shadow(color: .black, radius: /*@START_MENU_TOKEN@*/10/*@END_MENU_TOKEN@*/)
            .shadow(color: .black, radius: 10)
    }
}

extension View
{
    func prominentMyText() -> some View
    {
        modifier(MyText())
    }
}

struct ContentView_Previews: PreviewProvider
{
    static var previews: some View
    {
        ContentView()
    }
}

I would change the order in which things are shown on the screen. Now the score is in the middle and what I need to do at the bottom of the screen. if I choose the same option as the computer, the score doesn't change. I also see this back in your code "score += 0". Is this on on purpose? I would think that the user will loose if they tie since they needed to win or lose the game. Overall the code does seems to work well!

I reordered the app to make more sense. However I want to add a reset alert button and I am getting all kinds of errors.

Here is a pic of my current app:

Here is the code:

//
//  ContentView.swift
//  PaperRockScissorsProj4
//
//

import SwiftUI

struct ContentView: View
{

    let possibleMoves = ["🗒️", "🪨", "✂️"]
    @State private var currentChoice = ""
    @State private var currentChoiceNumber = 0
    @State private var appCurrentChoice = ""
    @State private var appCurrentChoiceNumber = 0
    @State private var shouldWin = true
    @State private var shouldWindToggle = false
    @State private var computerSelected = false
    @State private var score = 0
    @State private var shouldReset = false

    var body: some View
    {
        NavigationView
        {
            ZStack(alignment: .top)
            {
                AngularGradient(gradient: Gradient(colors: [.black, .blue, .black, .black, .black]), center: .center)
                    .ignoresSafeArea()
                VStack
                {
                    Section
                    {
                        Text("Paper, Rock, Scissors")
                            .foregroundStyle(.white)
                            .font(.largeTitle)
                        Spacer()
                        Spacer()

                        Text("Select Paper Rock Scissors")
                            .foregroundStyle(.white)
                            .font(.title)
                            .shadow(color: .yellow, radius: 10)
                            .shadow(color: .yellow, radius: 25)

                        Spacer()
                        Spacer()
                        Spacer()
                    }
                    Section
                    {
                        HStack
                        {
                            Spacer()
                            ForEach(0..<3)
                            { number in
                                Button(possibleMoves[number])
                                {
                                    currentChoiceNumber = number
                                    currentChoice = possibleMoves[currentChoiceNumber]
                                    print(currentChoice)
                                    selectMove()
                                    print(appCurrentChoice)
                                    playerScore()
                                    computerSelected = true
                                }
                                .buttonStyle(BorderlessButtonStyle())
                                Spacer()
                            }
                        } .font(.system(size: 50))
                    }
                    Spacer()
                    Spacer()

                    Section
                    {
                        Spacer()
                        Text("Player \(currentChoice)")
                            .prominentMyText()

                        Spacer()

                        Text(computerSelected ? "Computer  \(appCurrentChoice)" : "Computer")
                            .prominentMyText()
                        Spacer()
                        Text(shouldWin ? "Should win" : "Should lose")
                            .prominentMyText()

                        Spacer()
                        Text("Score \(score)")
                            .prominentMyText()

                        Spacer()
                        Button("Reset")
                        {
                            shouldReset = true
                        }
                        .alert("Reset the Game", isPresented: $shouldReset)
                        {
                            Button("OK", role: .destructive, "Cancel", role: .cancel)
                            {
                                resetGame()
                            }
                        }
                        Spacer()
                    }
                }
            }
        }
    }

    func moveTapped(_ number: Int)
    {
        currentChoice = possibleMoves[number]
        print(currentChoice)
    }

    func selectMove()
    {

        appCurrentChoiceNumber = Int.random(in: 0..<possibleMoves.count)

        appCurrentChoice = possibleMoves[appCurrentChoiceNumber]

        if shouldWindToggle
        {
            shouldWin.toggle()
        }
        else
        {
            shouldWin = Bool.random()
            shouldWindToggle = true
        }

    }
    func playerScore()
    {

        if (currentChoiceNumber == appCurrentChoiceNumber) && shouldWin
        {
            print("Tie but should win")
            print("currentChoice \(currentChoiceNumber)\(currentChoice) and appCurrentChoice \(appCurrentChoiceNumber)\(appCurrentChoice)")
            score -= 1
        } //Tie but should win
        else if (currentChoiceNumber == appCurrentChoiceNumber) && shouldWin == false
        {
            print("Tie but should lose")
            print("currentChoice \(currentChoiceNumber)\(currentChoice) and appCurrentChoice \(appCurrentChoiceNumber)\(appCurrentChoice)")
            score -= 1
        } //Tie but should lose
        else if (currentChoiceNumber == 0 && appCurrentChoiceNumber == 1 || currentChoiceNumber == 1 && appCurrentChoiceNumber == 2 || currentChoiceNumber == 2 && appCurrentChoiceNumber == 0) && shouldWin == false
        {

            score -= 1
            print("Win but should lose")
            print("currentChoice \(currentChoiceNumber)\(currentChoice) and appCurrentChoice \(appCurrentChoiceNumber)\(appCurrentChoice)")
        } // Win but should lose
        else if (currentChoiceNumber == 0 && appCurrentChoiceNumber == 1 || currentChoiceNumber == 1 && appCurrentChoiceNumber == 2 || currentChoiceNumber == 2 && appCurrentChoiceNumber == 0) && shouldWin == true
        {

            score += 1
            print("Win but should win")
            print("currentChoice \(currentChoiceNumber)\(currentChoice) and appCurrentChoice \(appCurrentChoiceNumber)\(appCurrentChoice)")
        } // Win but should win
        else if (currentChoiceNumber == 0 && appCurrentChoiceNumber == 2 || currentChoiceNumber == 1 && appCurrentChoiceNumber == 0 || currentChoiceNumber == 2 && appCurrentChoiceNumber == 1) && shouldWin == false
        {
            score += 1
            print("Lose but should lose")
            print("currentChoice \(currentChoiceNumber)\(currentChoice) and appCurrentChoice \(appCurrentChoiceNumber)\(appCurrentChoice)")
        } //Lose but should lose

        else if (currentChoiceNumber == 0 && appCurrentChoiceNumber == 2 || currentChoiceNumber == 1 && appCurrentChoiceNumber == 0 || currentChoiceNumber == 2 && appCurrentChoiceNumber == 1) && shouldWin
        {
            score -= 1
            print("Lose but should win")
            print("currentChoice \(currentChoiceNumber)\(currentChoice) and appCurrentChoice \(appCurrentChoiceNumber)\(appCurrentChoice)")
        } //Lose but should win

    }

    func resetGame()
    {
        currentChoice = ""
        currentChoiceNumber = 0
        appCurrentChoice = ""
        appCurrentChoiceNumber = 0
        shouldWin = true
        shouldWindToggle = false
        computerSelected = false
        score = 0
    }
}

struct MyText: ViewModifier
{
    func body(content: Content) -> some View
    {
        content
            .foregroundStyle(.white)
            .font(.largeTitle)
            .shadow(color: .black, radius: /*@START_MENU_TOKEN@*/10/*@END_MENU_TOKEN@*/)
            .shadow(color: .black, radius: 10)
    }
}

extension View
{
    func prominentMyText() -> some View
    {
        modifier(MyText())
    }
}

struct ContentView_Previews: PreviewProvider
{
    static var previews: some View
    {
        ContentView()
    }
}

Here is the code I'm adding:

 Spacer()
                        Button("Reset")
                        {
                            shouldReset = true
                        }
                        .alert("Reset the Game", isPresented: $shouldReset)
                        {
                            Button("OK", role: .destructive, "Cancel", role: .cancel)
                            {
                                resetGame()
                            }
                        }
                        Spacer()

Here is the errors I am getting: PaperRockScissorsProj4/PaperRockScissorsProj4/ContentView.swift:77:21 Struct 'ViewBuilder' requires that 'EmptyTableRowContent<V>' conform to 'View'

And this is the other one: PaperRockScissorsProj4/PaperRockScissorsProj4/ContentView.swift:79:25 Static method 'buildExpression' requires that 'Spacer' conform to 'TableRowContent'

So I manage to figure it out. Its about placement in the code. Now it works.