如何检查视图控制器是模态显示还是被推送到导航堆栈上? [英] How to check if a view controller is presented modally or pushed on a navigation stack?

问题描述

如何在我的视图控制器代码中区分:

How can I, in my view controller code, differentiate between:

• 以模态呈现
• 在导航堆栈上按下

在两种情况下，presentingViewController和isMovingToParentViewController均为YES，所以不是很有帮助.

Both presentingViewController and isMovingToParentViewController are YES in both cases, so are not very helpful.

使事情变得复杂的是，我的父视图控制器有时是模态的，要在其上推送要检查的视图控制器.

What complicates things is that my parent view controller is sometimes modal, on which the to be checked view controller is pushed.

事实证明，我的问题是我将HtmlViewController嵌入到UINavigationController中，然后显示.这就是为什么我自己的尝试以及下面的好答案都无效的原因.

It turns out my issue is that I embed my HtmlViewController in a UINavigationController which is then presented. That's why my own attempts and the good answers below were not working.

HtmlViewController*     termsViewController = [[HtmlViewController alloc] initWithDictionary:dictionary];
UINavigationController* modalViewController;

modalViewController = [[UINavigationController alloc] initWithRootViewController:termsViewController];
modalViewController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentViewController:modalViewController
                   animated:YES
                 completion:nil];

我想我最好告诉我的视图控制器何时是模态的，而不是试图确定.

I guess I'd better tell my view controller when it's modal, instead of trying to determine.

推荐答案

带一点盐，没有经过测试.

Take with a grain of salt, didn't test.

- (BOOL)isModal {
     if([self presentingViewController])
         return YES;
     if([[[self navigationController] presentingViewController] presentedViewController] == [self navigationController])
         return YES;
     if([[[self tabBarController] presentingViewController] isKindOfClass:[UITabBarController class]])
         return YES;

    return NO;
 }

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