解雇modalViewController的modalViewController

Question

所以我有一个UITabBarController应用程序,我想显示一个登录页面,所以我做了:

 [[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];

在我的LoginViewController里面,我还可以显示另一个modalViewController:

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

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

我有以下方法,其中askView是LoginViewController,当我想解雇这个我做:

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

但是,这并没有忽略LoginViewController并显示UITabBarController视图..它只是解除了我从LoginvVIewController显示的modalViewController.我在这做错了什么？我也收到以下错误:

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

为了消除在另一个模态视图上显示的模态视图,您必须调用dismissModalViewControllerAnimated:父视图的父视图.我已经在我的一些应用程序中使用了它,它对我来说非常漂亮(经过多次艰苦的努力试图解决它).这正是我用过的:

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

Answer 2

if ([self respondsToSelector:@selector(presentingViewController)]) {
    [self.presentingViewController.presentingViewController dismissModalViewControllerAnimated:YES]; // for IOS 5+
} else {
    [self.parentViewController.parentViewController dismissModalViewControllerAnimated:YES]; // for pre IOS 5
}