Provide iOS 17, SwiftUI code for a vertically scrolling onboarding view. Each step of the process is presented in a card format using GroupBox encased in a paged vertical scroll view.

To create a vertically scrolling onboarding view in iOS 17 using SwiftUI, where each step is presented in a card format using GroupBox and encased in a paged vertical scroll view, you can use the following code:

import SwiftUI

struct OnboardingView: View {
    let steps = [
        "Welcome to the App",
        "Track your progress",
        "Achieve your goals",
        "Stay motivated"
    ]
    
    var body: some View {
        TabView {
            ForEach(steps, id: \.self) { step in
                GroupBox {
                    VStack {
                        Text(step)
                            .font(.title)
                            .padding()
                        Spacer()
                    }
                }
                .padding()
            }
        }
        .tabViewStyle(PageTabViewStyle(indexDisplayMode: .always))
        .indexViewStyle(PageIndexViewStyle(backgroundDisplayMode: .always))
    }
}

struct OnboardingView_Previews: PreviewProvider {
    static var previews: some View {
        OnboardingView()
    }
}

Explanation:

1. TabView: This is used to create a paged view. By default, TabView in SwiftUI can be used with a PageTabViewStyle to create a paged scrolling effect.
2. GroupBox: Each step is wrapped in a GroupBox to give it a card-like appearance.
3. ForEach: Iterates over the steps array to create a view for each onboarding step.
4. PageTabViewStyle: This style is applied to TabView to enable paging behavior.
5. indexViewStyle: This is used to customize the appearance of the page indicator.

Relevant Sessions:

• Demystify SwiftUI containers (Sections)
• Create custom visual effects with SwiftUI (Scroll effects)

These sessions provide insights into creating custom containers and scroll effects in SwiftUI, which can be useful for further customization of your onboarding view.