Sign in with Apple実装

1. アプリのcapabilityで`Sign in with Apple` を選択

Xcodeで選択

Apple Developerサイトで選択

2. コード実装

func setupProviderLoginView() {
    authorizationButton = ASAuthorizationAppleIDButton(authorizationButtonType: .signIn, authorizationButtonStyle: .whiteOutline)
    authorizationButton.addTarget(self, action: #selector(handleAuthorizationAppleIDButtonPress), for: .touchUpInside)
    authorizationButton.cornerRadius = 10
    appleBaseView.addSubview(authorizationButton)
}

@objc
func handleAuthorizationAppleIDButtonPress() {
    let appleIDProvider = ASAuthorizationAppleIDProvider()
    let request = appleIDProvider.createRequest()
    request.requestedScopes = [.fullName, .email]
    
    let authorizationController = ASAuthorizationController(authorizationRequests: [request])
    authorizationController.delegate = self
    authorizationController.presentationContextProvider = self
    authorizationController.performRequests()
}

extension LoginViewController: ASAuthorizationControllerDelegate {
    func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization) {
        if let appleIDCredential = authorization.credential as? ASAuthorizationAppleIDCredential {
            
            let userIdentifier = appleIDCredential.user
            let fullName = appleIDCredential.fullName
            let email = appleIDCredential.email
            
            debugPrint("userIdentifier : \(userIdentifier)")
            debugPrint("fullName : \(String(describing: fullName))")
            debugPrint("email : \(String(describing: email))")
        }
    }
    
    func authorizationController(controller: ASAuthorizationController, didCompleteWithError error: Error) {
        debugPrint("didCompleteWithError : \(error)")
    }
}

extension LoginViewController: ASAuthorizationControllerPresentationContextProviding {
    func presentationAnchor(for controller: ASAuthorizationController) -> ASPresentationAnchor {
        return self.view.window!
    }
}

Sign in成功時のログ例

"userIdentifier : 000000.00000000000000000000000000000000.0000"
"fullName : Optional(givenName: XXXXXXX familyName: XXXXX )"
"email : Optional(\"xxxxxxxxx@privaterelay.appleid.com\")"