Tukukkk

I have Google Sign In in my iOS Swift app. It is working fine but each and every time I need to enter email id and password. Same time, parallelly, I am using Gmail App in my iPhone. How can I use that Gmail credentials from my app and direct login? Is it possible by using Google-SignIn-iOS SDK?

I need this same for Google, FB, Outlook, Twitter, LinkedIn.

ViewController:

import GoogleSignIn



class ViewController: UIViewController, GIDSignInUIDelegate {



    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.



        GIDSignIn.sharedInstance().uiDelegate = self



    }



    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }





    func sign(inWillDispatch signIn: GIDSignIn!, error: Error!) {



    }



    func sign(_ signIn: GIDSignIn!, present viewController: UIViewController!) {





    }



    func sign(_ signIn: GIDSignIn!, dismiss viewController: UIViewController!) {







    }



}

AppDelegate:

import GoogleSignIn

class AppDelegate: UIResponder, UIApplicationDelegate, GIDSignInDelegate {



    var window: UIWindow?





    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        // Override point for customization after application launch.





        GIDSignIn.sharedInstance().clientID = "3578***********************.apps.googleusercontent.com"

        GIDSignIn.sharedInstance().delegate = self



        return true

    }



    func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {

        return GIDSignIn.sharedInstance().handle(url as URL?,

                                                 sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as? String,

                                                 annotation: options[UIApplicationOpenURLOptionsKey.annotation])

    }

func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!,

              withError error: Error!) {

        if let error = error {

            print("(error.localizedDescription)")

        } else {

            // Perform any operations on signed in user here.

            let userId = user.userID                  // For client-side use only!

            let idToken = user.authentication.idToken // Safe to send to the server

            let fullName = user.profile.name

            let givenName = user.profile.givenName

            let familyName = user.profile.familyName

            let email = user.profile.email

            // ...



            print("emailemailemail   ", email)

        }

    }



    func sign(_ signIn: GIDSignIn!, didDisconnectWith user: GIDGoogleUser!,

              withError error: Error!) {

        // Perform any operations when the user disconnects from app here.

        // ...

    }

}

follow these steps

Step 1

in your appdelegate add the client ID and deeplinking purpose add the return value in source application

import GoogleSignIn



   func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        // Override point for customization after application launch.

        GIDSignIn.sharedInstance().clientID = "3578***********************.apps.googleusercontent.com"

        return true

    }



    func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {

        return GIDSignIn.sharedInstance().handle(url as URL?,

                                                 sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as? String,

                                                 annotation: options[UIApplicationOpenURLOptionsKey.annotation])

    }

for reusability purpose I created the common class for google signIn

import UIKit

import GoogleSignIn



class GoogleSDK: NSObject,GIDSignInDelegate,GIDSignInUIDelegate {

static let shared = GoogleSDK()

//MARK: Internal Properties

var signInBlock: ((GIDGoogleUser) -> Void)?



func googleSignIn()  {

    GIDSignIn.sharedInstance().delegate = self

    //        GIDSignIn.sharedInstance().signOut()

    //        GIDSignIn.sharedInstance().signIn()

    GIDSignIn.sharedInstance().scopes.append("https://www.googleapis.com/auth/plus.login")

    GIDSignIn.sharedInstance().scopes.append("https://www.googleapis.com/auth/plus.me")

    if GIDSignIn.sharedInstance().hasAuthInKeychain() == true {

        GIDSignIn.sharedInstance().signInSilently()

    } else {

        GIDSignIn.sharedInstance().signIn()

    }

}



//Google SignIn Delegates

func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {

    if error == nil {

        self.signInBlock?(user)



    } else {

        print("(error.localizedDescription)")

    }

}



func sign(_ signIn: GIDSignIn!, didDisconnectWith user: GIDGoogleUser!, withError error: Error!) {

    //  signInBlock(nil)

    //        if signInBlock != nil {

    //            signInBlock!(false, nil, error)

    //        }

}



}

on your current class invoke the NSObject call

 import GoogleSignIn



class ViewController: UIViewController, GIDSignInUIDelegate {



 // call the following method where you need

  // MARK: - Google Login

func GoogleLogin(){

    //  getTypeofLogin = getLoginType.Google.getName()

    GIDSignIn.sharedInstance().uiDelegate = self

    GoogleSDK.shared.googleSignIn()

    GoogleSDK.shared.signInBlock =   { (user) in

        if !user.userID.isEmpty{

            print(user)

            //self.handleSocialLogin(UID: user.userID, UName: user.profile.name, UEmail: user.profile.email, loginType:getLoginType.Google.getName())

        }

    }

}



}

for logout use this

  GIDSignIn.sharedInstance().signOut()