ios – Add google Signal-In with SwiftUI

GoogleSignIn 6.2.4 has the signIn operate that requires a presenting UIViewController.

To unravel this, add a sceneDelegate to the setting so it is accessible to SwiftUI.

Arrange an AppDelegate so we are able to hook up our SceneDelegate

class AppDelegate: NSObject, UIApplicationDelegate {
    // Hook up our SceneDelegate
    func software(_ software: UIApplication, 
                     configurationForConnecting connectingSceneSession: UISceneSession, 
                     choices: UIScene.ConnectionOptions) -> UISceneConfiguration {

        let configuration = UISceneConfiguration(title: nil, sessionRole: connectingSceneSession.function)
        if connectingSceneSession.function == .windowApplication {
            configuration.delegateClass = SceneDelegate.self
        }
    
        return configuration
    }
}

Arrange a SceneDelegate as an ObservableObject to maintain monitor of the window

// Set this up so we are able to entry the window within the setting
class SceneDelegate: NSObject, ObservableObject, UIWindowSceneDelegate {
    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, choices connectionOptions: UIScene.ConnectionOptions) {
        guard let windowScene = scene as? UIWindowScene else { return }
    
        self.window = windowScene.keyWindow
    }
}

Be sure you allow the AppDelegate within the App

@primary
struct AdrichApp: App {
    @UIApplicationDelegateAdaptor(AppDelegate.self) var delegate

    var physique: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

Lastly, use it in a SwiftUI View to point out your Proceed with Google button

struct SignInWithGoogle: View {
    @EnvironmentObject var sceneDelegate: SceneDelegate

    var physique: some View {
        if let vc = sceneDelegate.window?.rootViewController {
            continueWithGoogle(config: GIDConfiguration(clientID: "YOUR CLINET ID"), presenter: vc)
        } else {
            emptyView
        }
    }
    
    personal var emptyView: some View {
        print("Unable to entry the foundation view controller")
        return EmptyView()
    }
    
    personal func continueWithGoogle(config: GIDConfiguration, presenter: UIViewController) -> some View {
        Button {
            GIDSignIn.sharedInstance.signIn(with: config, presenting: presenter) { person, error in
                if let error = error {
                    print(error)
                    return
                }
                
                guard
                    let authentication = person?.authentication,
                    let idToken = authentication.idToken
                else {
                    return
                }
                
                let credential = GoogleAuthProvider.credential(withIDToken: idToken, accessToken: authentication.accessToken)

                // they're now signed in with Google!
            }
        } label: {
            Textual content("Proceed with Google")
        }
    }
}