apple-signin

Apple Sign-In

Implement Sign in with Apple using the native AuthenticationServices framework.

Step 1: Add Entitlement

Via xcodegen MCP:

mcp__xcodegen__add_entitlement with:
  key: "com.apple.developer.applesignin"
  value: ["Default"]

Step 2: Add Capability in Developer Portal

1. Go to developer.apple.com/account
2. Certificates, Identifiers & Profiles → Identifiers
3. Select your App ID
4. Enable "Sign In with Apple" capability

Step 3: SwiftUI Sign-In Button

import AuthenticationServices

struct SignInView: View {
    var body: some View {
        SignInWithAppleButton(.signIn) { request in
            request.requestedScopes = [.fullName, .email]
        } onCompletion: { result in
            switch result {
            case .success(let authorization):
                handleAuthorization(authorization)
            case .failure(let error):
                handleError(error)
            }
        }
        .signInWithAppleButtonStyle(.black)
        .frame(height: 50)
        .clipShape(.rect(cornerRadius: AppTheme.Style.cornerRadius))
        .padding(.horizontal, AppTheme.Spacing.md)
    }

    private func handleAuthorization(_ authorization: ASAuthorization) {
        guard let credential = authorization.credential as? ASAuthorizationAppleIDCredential else {
            return
        }

        let userID = credential.user
        let identityToken = credential.identityToken
        let email = credential.email           // Only on first sign-in
        let fullName = credential.fullName     // Only on first sign-in

        // Store userID in Keychain for future credential checks
        // Send identityToken to your configured auth service if needed
    }

    private func handleError(_ error: Error) {
        // Handle ASAuthorizationError
        // .canceled — user dismissed
        // .failed — authorization failed
        // .invalidResponse — invalid response
        // .notHandled — not handled
    }
}