kgleong

extension MyViewController:  UIViewControllerTransitioningDelegate {
    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }
    
    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }
}

kgleong

extension MyViewController: UIViewControllerAnimatedTransitioning {
    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 2.0
    }
    
    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        // Retrieve the view controllers participating in the current transition from the context.
        let fromView = transitionContext.viewController(forKey: .from)!.view!
        let toView = transitionContext.viewController(forKey: .to)!.view!

kgleong

import GoogleSignIn

class AppDelegate: UIResponder, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        GIDSignIn.sharedInstance()?.clientID = "769307225775-llbr5f6avrd35u7rpto9p700p2g900qr.apps.googleusercontent.com"
        return true
    }
}

kgleong

func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
    let sourceApplication = options[.sourceApplication] as? String
    let annotation = options[.annotation]
    
    return GIDSignIn.sharedInstance()?.handle(url, sourceApplication: sourceApplication, annotation: annotation) ?? false
}

kgleong

import GoogleSignIn

class ViewController: UIViewController {
    let googleSignInButton = UIButton()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.addSubview(googleSignInButton)
        googleSignInButton.setTitle("Google Sign In", for: .normal)

kgleong

extension ViewController: GIDSignInDelegate, GIDSignInUIDelegate {
    // MARK: - GIDSignInDelegate
    
    func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
        // A nil error indicates a successful login
        googleSignInButton.isHidden = error == nil
    }
}

kgleong

import GoogleSignIn

class ViewController: UIViewController {
    // ...
  
    override func viewDidLoad() {
        super.viewDidLoad()
        
        /***** Configure Google Sign In *****/ 
      

kgleong

import GoogleSignIn
import GoogleAPIClientForREST
import GTMSessionFetcher

class ViewController: UIViewController {
    let googleDriveService = GTLRDriveService()

    override func viewDidLoad() {
        // ...
        GIDSignIn.sharedInstance()?.scopes = [kGTLRAuthScopeDriveFile]

kgleong

import GTMSessionFetcher

extension ViewController: GIDSignInDelegate, GIDSignInUIDelegate {
    func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
        // A nil error indicates a successful login
        if error == nil {
            // Use the authenticated user's credentials when querying the Google Drive API.
            self.googleDriveService.authorizer = user.authentication.fetcherAuthorizer()
        } else {
            self.googleDriveService.authorizer = nil

kgleong

import GTMSessionFetcher

extension ViewController: GIDSignInDelegate, GIDSignInUIDelegate {
    func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
        // A nil error indicates a successful login
        if error == nil {
            // Include authorization headers/values with each Drive API request.
            self.googleDriveService.authorizer = user.authentication.fetcherAuthorizer()
            self.googleUser = user
        } else {