Question

So I have a UITabBarController app and I want to display a login page, and so I did:

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(userDidLogin:) name:UserDidLoginNotification object:nil];
LoginViewController* loginViewController = [[LoginViewController alloc] init];
        self.tabBarController.selectedViewController = [self.tabBarController.viewControllers objectAtIndex:0];
        [self.tabBarController.selectedViewController presentModalViewController:loginViewController animated:NO];
        [loginViewController release];

Inside my LoginViewController I can as well show another modalViewController:

- (void) twitterLogin: (UIViewController *) askingView
{
    UIViewController *controller = [SA_OAuthTwitterController controllerToEnterCredentialsWithTwitterEngine: _twitter delegate: self];

    if (controller) {
        self.askingView = askingView;
        [askingView presentModalViewController: controller animated: YES];
    }
}

I have the following method where the askingView is the LoginViewController,
when I want to dismiss this I do:

[self.askingView dismissModalViewControllerAnimated:YES];
    [[NSNotificationCenter defaultCenter] postNotificationName:UserDidLoginNotification object:nil];

However, this doesn’t dismiss the LoginViewController and show the UITabBarController views.. it just dismisses my modalViewController shown from the LoginvVIewController. What am I doing wrong here? I am also getting the following error:

attempt to dismiss modal view controller whose view does not currently appear. self = <LoginViewController: 0x2aff70> modalViewController = <SA_OAuthTwitterController: 0x2d2a80>
2011-09-16 09:45:37.750 VoteBooth[4614:707] attempt to dismiss modal view controller whose view does not currently appear. self = <MainViewController: 0x29fec0> modalViewController = <LoginViewController: 0x2aff70>

Answer 1

In order to dismiss a modal view that is presented over another modal view, you have to call dismissModalViewControllerAnimated: on the parent of the parent. I have used this in some of my apps and it has worked beautifully for me (after many painstaking hours trying to figure it out). Here is exactly what I’ve used:

[[[self parentViewController] parentViewController] dismissModalViewControllerAnimated:YES];