Using GTMOAuth2ViewControllerTouch as a modal view instead of pushing it as a navcontroller view

[Zak]

How can I adapt or subclass GTMOAuth2ViewControllerTouch to use as a modal view? Currently I have it opening ok, but it fails at a few key places (for example, it doesn't auto-close when it reaches the authorization success page.). What steps do I need to take to make it work as a modal view?

[David Phillip Oster (☃)]

Where the sample app calls:

  [[self navigationController] pushViewController:viewController animated:YES];

instead call:

   MyNavigationController *presentModal = [[[MyNavigationController alloc] initWithRootViewController:viewController] autorelease];

  [presentModal setDismisser:self];

  UIBarButtonItem *cancelButton = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(doDismiss)] autorelease];

  [[viewController navigationItem] setLeftBarButtonItem:cancelButton];

  [[self navigationController] presentModalViewController:presentModal animated:YES];

where doDismiss is:

- (void)doDismiss {

  [self dismissModalViewControllerAnimated:YES];

}

that handles showing and canceling. 

For auto-dismiss, we catch the pop that the OAuth2ViewController will do:

@interface MyNavigationController : UINavigationController

@property (nonatomic, assign) UIViewController *dismisser;

- (UIViewController *)popViewControllerAnimated:(BOOL)animated;

@end

@implementation MyNavigationController

@synthesize dismisser;

- (UIViewController *)popViewControllerAnimated:(BOOL)animated {

  if ([[self viewControllers] count] <= 1) {

    UIViewController *result = [[[self topViewController] retain] autorelease];

    [dismisser dismissModalViewControllerAnimated:YES];

    return result;

  } else {

    return [super popViewControllerAnimated:animated];

  }

}

@end

Warning: I didn't actually try the auto-dismiss case.

[Greg Robbins]

We have recently added a property to the gtm-oauth2 iOS view controller, popViewBlock, which is a block the app can set that will be called when the view should be removed. You may find that helpful.

[Greg Robbins]

The popViewBlock should be called immediately and the kGTMOAuth2UserSignedIn notification posted as the controller detects the server's end-of-sign-in signals. 

It may take longer for the completion handler for auth to be called, as additional fetches are needed to obtain an access token and, for Google sign-ins, the user's email address.