gistlib - create a login with facebook service layer in swift

To create a login with Facebook service layer in Swift and iOS, follow these steps:

Import the Facebook SDK in your project.


main.swift
import FBSDKLoginKit
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Create a login button in your view controller where you want the Facebook login to be displayed. You can use the FBSDKLoginButton class to create this button easily.


main.swift
let loginButton = FBSDKLoginButton()
loginButton.permissions = ["public_profile", "email"]
loginButton.delegate = self
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Implement the FBSDKLoginButtonDelegate protocol in your view controller to handle the login button callbacks.


main.swift
func loginButton(_ loginButton: FBSDKLoginButton, didCompleteWith result: FBSDKLoginManagerLoginResult?, error: Error?) {
    if error != nil {
        print(error?.localizedDescription)
    } else if result?.isCancelled == true {
        print("Login cancelled")
    } else {
        // Login successful, process the user data
        processFacebookLogin()
    }
}

func loginButtonDidLogOut(_ loginButton: FBSDKLoginButton) {
    // User logged out, implement action if necessary
}
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Create a service layer class to handle the user data processing. This class should implement a method to process the Facebook login, which will receive the user data from the login button callback.


main.swift
class FacebookService {

    func processFacebookLogin(from result: FBSDKLoginManagerLoginResult) {
        guard let token = result.token?.tokenString else {
            print("Failed to get access token")
            return
        }
        
        let request = FBSDKLoginKit.GraphRequest(graphPath: "me", parameters: ["fields":"email,name"], tokenString: token, version: nil, httpMethod: .get)
        request.start(completionHandler: {(connection, result, error) -> Void in
            if let userData = result as? [String:Any], error == nil {
                // Handle user data here
                let name = userData["name"] as? String
                let email = userData["email"] as? String
                // Do something with name and email
            }
        })
    }
}
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Call the service layer processFacebookLogin method from your view controller.


main.swift
func processFacebookLogin() {
    guard let token = FBSDKAccessToken.current()?.tokenString else { return }
    let service = FacebookService()
    service.processFacebookLogin(from: FBSDKLoginManagerLoginResult(token: FBSDKAccessToken.current()!, isCancelled: false, grantedPermissions: [], declinedPermissions: []))
}
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This will process the Facebook login and retrieve the user data from Facebook's Graph API. You can then use this data as necessary in your application.

create a login with facebook service layer in swift

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