在演示或关闭正在进行时尝试从视图控制器中关闭 [英] Attempt to dismiss from view controller while a presentation or dismiss is in progress

问题描述

我有两个 UIViewController 类，其中在 FirstClass 我有一个 UIButton 用于 Login，当用户点击时在按钮上，我将显示 SecondClass...为此，我已经完成了，

I have TWO UIViewController classes, where in FirstClass i have an UIButton for Login, when user taps on button, i will display SecondClass... For that i have done,

SecondClass *index = [[SecondClass alloc] init];
[self presentModalViewController:index animated:YES];

在SecondClass中，我有一个注销按钮，它将重定向到FirstClass，为此我已经完成了，

In SecondClass i have a logout button, which will redirect to FirstClass, for that i have done,

[self dismissModalViewControllerAnimated:YES];

当我在 SecondClass 中按下注销按钮时，我收到警告消息

When i press Logout button in SecondClass, i get the warning msg

**Attempt to dismiss from view controller <FirstClass: 0e39w88e160> while a presentation or dismiss is in progress!**

这里有什么问题..

推荐答案

添加了 iOS 6 和 iOS 6 之前的答案:

Added both iOS 6 and pre-iOS 6 answers:

iOS 5.0 及更高版本

当您退出时，在取消之前添加此检查:

When you logout, add this check before dismissing:

if (![self.presentedViewController isBeingDismissed])
{
    [self dismissModalViewControllerAnimated:YES completion:nil];
}

iOS 4.X 及更低版本

在关闭之前添加此检查:

Add this check before dismissing:

if (![[self modalViewController] isBeingDismissed])
{
    [self dismissModalViewControllerAnimated:YES];
}

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