Black Screen when authetication is completed

[David Lam]

Hi guys,

I'm working on an iphone project using gtm-oauth2 from cocoa pods.

I have a strange issue where there is a black screen when my authetication is completed. The data flow (ie authToken) and everything works as expected downstream.

General approach: 

1. Instantiate GTMOAuth2ViewControllerTouch controller.
2. Config

3. push on top of existing controller

Symptoms:

1. Right before completion handler is called, there is a black border for a split second as shown in the video
2. This does not happen if I were to present the GTMOAuth2ViewControllerTouch controller instead of pushing it on top of the navigation stack

func startGetAuthToken() {
let oauthViewController : GTMOAuth2ViewControllerTouch = GTMOAuth2ViewControllerTouch.controllerWithScope					("https://mail.google.com/",
		clientID: CLIENT_ID,
		clientSecret: CLIENT_SECRET,
		keychainItemName: keyChainForAccount,
		completionHandler:
		{ (viewController, retrievedAuth, error) -> Void in
			if let error = error {
				self.userClickedCancel()
			} else {
				self.navigationController?.navigationBarHidden = true
				self.doneFetchingAuth(retrievedAuth)
			}
 
	}) as! GTMOAuth2ViewControllerTouch
	oauthViewController.authentication.redirectURI = "http://localhost//maildough"
 
	let barButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Cancel, 
							target: self, 
							action: "userClickedCancel")
	barButtonItem.tintColor = UIColor.whiteColor()
	oauthViewController.navigationItem.setLeftBarButtonItem(barButtonItem, animated: false)
	self.navigationController?.pushViewController(oauthViewController, animated: false)
        //Flag for some downstream operation
	oauthViewControllerShown = true
}

https://gist.github.com/deltadavid/6fc4a33f669846aa7ab2

Any pointers will be greatly appreciated :D

Cheers

David