how to create a log in with apple in swiftui

To create a "Log in with Apple" feature in SwiftUI, you would typically use the ASAuthorizationAppleIDButton from the AuthenticationServices framework. This button provides a standard interface for users to log in with their Apple ID. Here's a basic example of how you might implement this in SwiftUI:

import SwiftUI
import AuthenticationServices

struct ContentView: View {
    var body: some View {
        SignInWithAppleButton(
            .signIn,
            onRequest: { request in
                // Configure the request here
                request.requestedScopes = [.fullName, .email]
            },
            onCompletion: { result in
                switch result {
                case .success(let authorization):
                    // Handle successful authorization
                    if let appleIDCredential = authorization.credential as? ASAuthorizationAppleIDCredential {
                        let userIdentifier = appleIDCredential.user
                        let fullName = appleIDCredential.fullName
                        let email = appleIDCredential.email
                        // Use the credentials as needed
                    }
                case .failure(let error):
                    // Handle error
                    print("Authorization failed: \(error.localizedDescription)")
                }
            }
        )
        .signInWithAppleButtonStyle(.black)
        .frame(width: 280, height: 45)
    }
}

This code snippet creates a "Sign in with Apple" button using SwiftUI. When the button is pressed, it initiates an authorization request. You can configure the request to ask for the user's full name and email. The completion handler processes the result, handling both success and failure cases.

For more detailed guidance on using SwiftUI, you might want to check out the session SwiftUI essentials from WWDC 2024, which covers the fundamentals of views and built-in capabilities across all platforms.