ios - 警告 : Attempt to dismiss from view controller <UINavigationController: 0xb359a20> while a presentation or dismiss is in progress

Question

在我的应用程序中我正在做的是:

rootViewController -> pushViewController -> pushViewController -> pushViewController -> presentModalViewController

我想从 presentModalViewController 直接转到 rootViewController。

所以我所做的是:

while(theViewController = [theObjectEnumerator nextObject ])
     {
         if([theViewController modalTransitionStyle] == UIModalTransitionStyleCoverVertical)
         {
             [self.mNavigationController popToRootViewControllerAnimated:
              YES];
         }
     }
 }else
while(theViewController = [theObjectEnumerator nextObject ])
{
    if([theViewController modalTransitionStyle] == UIModalTransitionStyleCoverVertical)
    {
        [self.mNavigationController dismissModalViewControllerAnimated:YES];
    }
}

但是我收到一条消息
警告:在演示或解散过程中尝试从 View Controller 中解散!

在这个应用程序崩溃之后。

我搜索了这个但找不到对我有用的东西， 谁能解释为什么会这样？

Answer 1

[self dismissViewControllerAnimated:YES completion:^{
    [(UINavigationController *)self.presentingViewController popToRootViewControllerAnimated:YES];
}];

这段代码对我来说很好，

重要:

viewController 必须由 navigationController 呈现。 (大多数情况下) 如果没有，调用 self.presentingViewController.navigationController。