Trouble handling Google sign in Swift 3

Question

I am new to iOS and am having trouble with app delegate URL handling in Swift 3, and I could really use some pointers.

The below code works perfectly fine in Swift 2

Answer 1

For swift 5 Xcode 10.3 (Latest google signin)

@available(iOS 9.0, *)
    func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any]) -> Bool {
        let googleDidHandle = GIDSignIn.sharedInstance().handle(url)

        return googleDidHandle
    }

    func application(_ application: UIApplication,open url: URL, sourceApplication: String?, annotation: Any) -> Bool {
        let googleDidHandle = GIDSignIn.sharedInstance().handle(url)

        return googleDidHandle
    }

To open signIn screen on Button click

@IBAction func btnGoogleSigninClick(_ sender: AnyObject) {
        GIDSignIn.sharedInstance()?.presentingViewController = self
        GIDSignIn.sharedInstance()?.restorePreviousSignIn()

        GIDSignIn.sharedInstance().signIn()
    }