解雇modalViewController的modalViewController

问题描述

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：

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];

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

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];
    }
}

我有以下方法，其中askView是LoginViewController ，
，当我想解雇我时：

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];

然而，这并没有解除LoginViewController并显示UITabBarController视图..它只是取消了我的modalViewController从LoginvVIewController中显示。我在这做错了什么？我也收到以下错误：

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>

推荐答案

为了解除显示的模态视图另一个模态视图，您必须在父项的父项上调用 dismissModalViewControllerAnimated：。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：

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];

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