ios - Sign In with Apple：如何为现有应用程序实现它？

Question

随着 Apple 于 2019 年 6 月 3 日发布的最新重大更新，有一项功能Sign In with Apple。有关“如何在应用程序中使用”的信息是可用的，但我可以看到任何示例源代码，如何在您现有的 iOS 应用程序中实现此功能。

我正在寻找一个示例源代码，因为我不明白如何开始。

以及我尝试过的：使用 Apple 登录

Answer 1

第一步是你需要import AuthenticationServices

如何检查该用户凭据状态

        let appleIDProvider = ASAuthorizationAppleIDProvider()
        appleIDProvider.getCredentialState(forUserID: KeychainItem.currentUserIdentifier) { (credentialState, error) in
            switch credentialState {
            case .authorized:
                // The Apple ID credential is valid.
                break
            case .revoked:
                // The Apple ID credential is revoked.
                break
            case .notFound:
                // No credential was found, so show the sign-in UI.
               
            default:
                break
            }
        }

如何使用 Apple 创建登录

第1步

如果找到现有的 iCloud 钥匙串凭据或 Apple ID 凭据，则提示用户。实施ASAuthorizationControllerDelegate到

func performExistingAccountSetupFlows() {
    // Prepare requests for both Apple ID and password providers.
    let requests = [ASAuthorizationAppleIDProvider().createRequest(),
                    ASAuthorizationPasswordProvider().createRequest()]
    
    // Create an authorization controller with the given requests.
    let authorizationController = ASAuthorizationController(authorizationRequests: requests)
    authorizationController.delegate = self
    authorizationController.presentationContextProvider = self
    authorizationController.performRequests()
}

extension ViewController: ASAuthorizationControllerDelegate {
    func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization) {
        if let appleIDCredential = authorization.credential as? ASAuthorizationAppleIDCredential {
         //here is credentials . 
        }
    }
}

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

第2步：

创建按钮

    let authorizationButton = ASAuthorizationAppleIDButton()
    authorizationButton.addTarget(self, action: #selector(handleAuthorizationAppleIDButtonPress), for: .touchUpInside)

第三步

@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()
}

可用性：iOS 13 或更高版本

Demo Application: A complete working demo application with keychain integration available on Github - https://github.com/developerinsider/Sign-In-with-Apple-Demo

Note: I will update answer with more and more useful information soon.

Hope it is helpful .