Google Sign-In via Firebase: Gidsignindelegate Does Not Conform to Viewcontroller

Cannot find type GIDSignInDelegate and property clientID with Google sign in with firebase

Since 6.0.0 GoogleSignIn doesn't have a delegate anymore, they've switched to completions(probably to easily support new swift concurrency).

Check out migration guide.

You can use it like this now, in your view controller:

GIDSignIn.sharedInstance.signIn(
    with: "clientId",
    presenting: self // your view controller
) { user, error in
    if let token = user?.authentication.idToken {
        completionHandler(token, nil)
        return
    }
    guard let error = error as? GIDSignInError else { 
        fatalError("No token and no GIDSignInError: \(String(describing: error))") 
    }
    completionHandler(nil, error)
}

In your AppDelegate you need this(just like before):

func application(
    _ app: UIApplication,
    open url: URL,
    options: [UIApplication.OpenURLOptionsKey: Any] = [:]
) -> Bool {
    return GIDSignIn.sharedInstance.handle(openURL)
}

Type ViewController does not conform to protocol GIDSignInDelegate

Add These function to your code :-

func signIn(signIn: GIDSignIn!, didSignInForUser user: GIDGoogleUser!, withError error: NSError!) {...}
func signIn(signIn: GIDSignIn!, didDisconnectWithUser user: GIDGoogleUser!, withError error: NSError!) {...}

For future reference , if you ever see this error just cmd+click the delegate in your case GIDSignInDelegate protocol that your class is not conforming to and you will see a bunch of function written in that protocol that needs to be conformed by this class - which is to inherit from that protocol, include those function in your class and you are golden..(Mostly)

PS:- some protocol functions are marked optional meaning including them is up to you and you wont face this error if you dont, but some which are not are mandatory.

Segue after Firebase Google LogIn Xcode 11

Like this:

let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
var vc: UIViewController?
vc = storyboard.instantiateViewController(withIdentifier: "signed")
window?.rootViewController = vc
window?.makeKeyAndVisible()

AppDelegate does not conform to protocol 'GIDSignInDelegate' in Swift 3

It looks like you defined the methods of that protocol outside of the AppDelegate class, so they are just global functions, not methods.

You need to move them inside the } that closes AppDelegate (just above the first protocol method).

Tip: if you select all of the code in that file and press Ctrl+I Xcode will reindent your code which may make it easier to see what's going wrong.

Firebase iOS Google sign in -- use of undeclared type GIDSignInDelegate

From your code, its vivid that you're currently running Swift 3.0 but some of your methods are still Swift 2. For Swift 3.0, the new delegate method is

func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!)
{
    if error != nil
    {
        print("Google Sign In Error")        
    }
    else
    {
        // Do stuff
    }
}

openURL, didFinishLaunchingWithOptions and didDisconnectWithUser also have changed in Swift 3.0. I'd recommend you re-implement them.

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