Facebook Login in iOS with firebase

Hello Guys, Welcome to the new tutorial. Here I am going to tell you how to do Facebook login in iOS with firebase. Facebook developer tools provide lot’s of feature but today in this tutorial we are going to cove only Facebook login with firebase.

The very first step is.You have to create on project into Firebase. As shown into the video. So please first follow the procedures from firebase developer website.

After completing this step then create one application into Facebook developer account, If you are new to this then check the complete video.

After that, enable Facebook authentication in firebase and copy app id and app secrete key from the Facebook application setting. As mention into video.

After that, If you done with all the setup then write the code in your button click action.

@IBAction func fbAction(_ sender: Any) {
        let loginManager = LoginManager()
        loginManager.logIn(permissions: ["public_profile", "email"], from: self) { (result, error) in
            if let error = error {
                print("Failed to login: \(error.localizedDescription)")
                return
            }
            
            guard let accessToken = AccessToken.current else {
                print("Failed to get access token")
                return
            }

            let credential = FacebookAuthProvider.credential(withAccessToken: accessToken.tokenString)
            
            // Perform login by calling Firebase APIs
            Auth.auth().signIn(with: credential, completion: { (user, error) in
                if let error = error {
                    print("Login error: \(error.localizedDescription)")
                    let alertController = UIAlertController(title: "Login Error", message: error.localizedDescription, preferredStyle: .alert)
                    let okayAction = UIAlertAction(title: "OK", style: .cancel, handler: nil)
                    alertController.addAction(okayAction)
                    self.present(alertController, animated: true, completion: nil)
                    return
                }else {
                    self.currentUserName()
                }
            
            })

        }
    }

In addition, there is one more function which will give you the definition of self.currentUserName() function.

func currentUserName()  {
        if let currentUser = Auth.auth().currentUser {
            self.btn_sign_out.isHidden = false
            lb_login_Status.text = "YOU ARE LOGIN AS - " +  (currentUser.displayName ?? "DISPLAY NAME NOT FOUND")
        }
    }

No Finally we will see the log out button action!

@IBAction func btnSignOutAction(_ sender: Any) {
        let firebaseAuth = Auth.auth()
        do {
            try firebaseAuth.signOut()
            self.lb_login_Status.text = "Please login now"
            self.btn_sign_out.isHidden = true
        } catch let signOutError as NSError {
          print ("Error signing out: %@", signOutError)
        }
    }

So that was the complete scenario of Facebook login in iOS with firebase. I hope this tutorial helps you to dive into this. If you want to learn more about this then please visits on below link-

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