Hello iOS enthusiasts! Today, we embark on a journey to integrate the renowned Sign in with Apple feature into our SwiftUI apps. Prioritizing user privacy and a seamless experience, Apple’s authentication system is truly a game-changer. Let’s dive right in.

Prerequisites

1. MacOS with the latest version of Xcode installed.
2. A basic understanding of SwiftUI and Swift.
3. An active Apple Developer Account.

Initial Setup: Activating Sign in with Apple Capability

Before writing any code, we must ensure our project is set up correctly.

1. Open your project in Xcode.
2. Select the target for where you want to add the Sign in with Apple capability.
3. Click on the Signing & Capabilities tab.
4. Click “+ Capability” and add “Sign in with Apple”.

By adding this capability, Xcode will make necessary entitlements and configure the app for Sign in with Apple authentication.

Setting the SwiftUI View

With the capability set up, it’s time to design our SwiftUI view and integrate Sign in with Apple.

Here’s our foundational code:

import AuthenticationServices
import SwiftUI

struct ContentView: View {
    @AppStorage("email") var email : String = ""
    @AppStorage("firstName") var firstName : String = ""
    @AppStorage("lastName") var lastName : String = ""
    @AppStorage("userID") var userID : String = ""

    // ... the remaining implementation will go here ...
}

Integrating SignInWithAppleButton

Apple’s SignInWithAppleButton view is an all-in-one solution that effortlessly links the authentication process with SwiftUI.

Here’s the button in action:

SignInWithAppleButton(.continue){ request in
    request.requestedScopes = [.email, .fullName]
} onCompletion: { results in
    // Handle authentication results
}.frame(width: 100,  height: 50)

Handling Authentication Feedback

Post authentication, we’ll receive feedback that requires processing:

1. Success: Procure user data, i.e., email, first name, last name, and user ID.
2. Failure: Handle or print the error for troubleshooting.

Our results handler would look like:

switch results {
case .success(let auth):
    switch auth.credential {
    case let credential as ASAuthorizationAppleIDCredential :
        let userID = credential.user
        let email = credential.email
        let firstName = credential.fullName?.givenName
        let lastName = credential.fullName?.familyName

        self.email = email ?? ""
        self.firstName = firstName ?? ""
        self.lastName = lastName ?? ""
        self.userID = userID
    default : break
    }
case .failure(let error) : print(error)
}

Providing UI Feedback

After authentication, it’s optimal to provide some feedback to the user. In our case, we’ll exhibit a welcoming message.

if userID.isEmpty {
    // ... Display SignInWithAppleButton ...
} else {
    Text("Welcome !")
}

Tying Everything Together

Integrating all the sections gives you a fully functional Sign in with Apple feature for your SwiftUI app.

Final Thoughts

Sign in with Apple is not just an authentication system; it’s a testament to user privacy and security in this digital age. Integrating it into SwiftUI is an intuitive process, ensuring that users have a smooth and trustworthy experience.

Remember to treat user data with utmost respect, adhering to privacy guidelines and user preferences.

For more SwiftUI tutorials and insights, keep an eye on this space. Questions, comments, or issues? Please drop them below. Here’s to secure coding!