如何检查视图控制器是否以模态方式呈现或推送到导航堆栈上?

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:

• 模态呈现
• 推送到导航堆栈

presentingViewController 和 isMovingToParentViewController 在这两种情况下都是 YES，所以不是很有帮助.

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

让事情变得复杂的是，我的父视图控制器有时是模态的，要检查的视图控制器被推送到它上面.

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

原来我的问题是我将我的 HtmlViewController 嵌入到 UINavigationController 中，然后显示.这就是为什么我自己的尝试和下面的好答案都不起作用的原因.

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什么时候是模态的，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

持保留态度，没有测试.

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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