Sign In with Google Authentication - swift

Question

I've implemented Google Authentication via Firebase in my App. Everything works smoothly except for one small problem that I can't seem to find. Whenever the user opens the page that prompts them to "Sign in with Google" (ie. login page or sign up page), the banner appears momentarily before disappearing. I do not want it to appear at all, unless the user clicks the "Sign in with Google" button. How can I get rid of this?
WelcomeViewController (the view controller with the google login)
import UIKit
import FirebaseAuth
import Firebase
import FBSDKLoginKit
import GoogleSignIn
class WelcomeViewController: UIViewController, GIDSignInDelegate {
#IBOutlet weak var stackView: UIStackView!
#IBOutlet weak var signInFacebookButton: UIButton!
#IBOutlet weak var signInGoogleButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
setUpGoogleButton()
GIDSignIn.sharedInstance()?.presentingViewController = self
GIDSignIn.sharedInstance().signIn()
}
// SIGN IN WITH GOOGLE
func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
if let err = error {
print("Failed to log into Google: ", err)
return
}
print("Successfully logged into Google")
guard let authentication = user.authentication else { return }
let credential = GoogleAuthProvider.credential(withIDToken: authentication.idToken, accessToken: authentication.accessToken)
Auth.auth().signIn(with: credential, completion: { (user, error) in
if let err = error {
print("Failed to create a Firebase User with Google account: ", err)
return
}
// Successfully logged in
guard let uid = user?.user.uid else { return }
print("Successfully logged into Firebase with Google", uid)
// switch to tab bar controller
let tabBarC = self.storyboard?.instantiateViewController(withIdentifier: "mainTabBarController") as! TabBarController
tabBarC.modalPresentationStyle = .fullScreen
self.present(tabBarC, animated: true, completion: nil)
print("Switched to TabBarController")
})
}
fileprivate func setUpGoogleButton() {
let button = signInGoogleButton
button?.layer.borderWidth = 0
button?.backgroundColor = UIColor.init(red: 130/255, green: 178/255, blue: 189/255, alpha: 1)
button?.layer.cornerRadius = 20.0
button?.tintColor = UIColor.white
button!.addTarget(self, action:
#selector(handleCustomGoogleSignIn), for: .touchUpInside)
GIDSignIn.sharedInstance()?.delegate = self
}
#objc func handleCustomGoogleSignIn() {
GIDSignIn.sharedInstance().signIn()
}
I've attached a link to a screen recording of what happens. The second page shown in the screen recording is identical to the code below, so it has the same problem. Any help is appreciated, thank you!
https://drive.google.com/file/d/1t4KV0Z6qwfCK56Gf2314wXWhAeQR0wUs/view?usp=sharing

Answer 1

That's because of your code inside viewDidLoad(). You are implementing this method:
GIDSignIn.sharedInstance().signIn()
This triggers the sign in method as soon as the view loads (as you are implementing it inside viewDidLoad()), and that causes that momentary sign in pop up that disappears.
Instead of implementing that method there, you should only implement it inside your handleCustomGoogleSignIn().
Conclusion, your viewDidLoad() should look like this:
override func viewDidLoad() {
super.viewDidLoad()
setUpGoogleButton()
GIDSignIn.sharedInstance()?.presentingViewController = self
}