blindgame

contentview.swiftui
**********************
import SwiftUI

struct ContentView: View {
    //create an rgb color random values
    let rTarget = Double.random(in: 0..<1)
    let gTarget = Double.random(in: 0..<1)
    let bTarget = Double.random(in: 0..<1)

    //show the state of show alert (if we need to present it or hide it)
    @State var showAlert=false
    //the user guess numbers
    @State var rGuess:Double
    @State var gGuess:Double
    @State var bGuess:Double


    func computeScore()->Int{
        let rDiff = rGuess - rTarget
        let gDiff = gGuess - gTarget
        let bDiff = bGuess - bTarget
        //sqrt(rdiff^2 + gDiff^2 + bDiff^2)
        let diff = sqrt(rDiff * rDiff + gDiff*gDiff + bDiff*bDiff)
        return Int((1.0-diff)*100+0.5)
    }

    var body: some View {
        VStack{
            HStack{
                //target color block
                VStack{
                    Rectangle()
                        .foregroundColor(Color(red: rTarget, green: gTarget, blue:  bTarget, opacity: 1.0))
                    Text("Match this color")
                }
                //guess color block
                VStack{
                    Rectangle()
                        .foregroundColor(Color(red: rGuess, green: gGuess, blue: bGuess, opacity: 1.0))
                    HStack{
                        Text("R: \(Int(rGuess*255.0))")
                        Text("G: \(Int(gGuess*255.0))")
                        Text("B: \(Int(bGuess*255.0))")
                    }
                }
            }
            Button(action: {
                //what to do when we hit the button
                self.showAlert = true
            }){
                Text ("Hit me")
            }
            .alert(isPresented: $showAlert){
                Alert(title: Text("Your score"), message: Text("\(computeScore())"))
            }
            VStack{
                ColorSlider(value: $rGuess , textColor: .red)
                ColorSlider(value: $gGuess, textColor: .green)
                ColorSlider(value: $bGuess, textColor: .blue)
            }
        }
    }
}

struct ColorSlider : View {
    @Binding var value:Double
    var textColor: Color
    var body: some View{
        HStack{
            Text("0")
            .foregroundColor(textColor)
            Slider(value: $value)
            Text("255")
            .foregroundColor(textColor)
        }
    .padding()
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView(rGuess: 0.5, gGuess: 0.5, bGuess: 0.5)
    }
}

sceneDelegate.swift
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 func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).

        // Create the SwiftUI view that provides the window contents.
        let contentView = ContentView(rGuess: 0.5, gGuess: 0.5, bGuess: 0.5)

        // Use a UIHostingController as window root view controller.
        if let windowScene = scene as? UIWindowScene {
            let window = UIWindow(windowScene: windowScene)
            window.rootViewController = UIHostingController(rootView: contentView)
            self.window = window
            window.makeKeyAndVisible()
        }
    }