控制导航堆栈中的更改 [英] Controlling changes in the navigation stack

问题描述

当用户从导航控制器中选择后退按钮时，我希望能够检查特定条件-然后显示警报并阻止弹出导航堆栈。

I want to be able to check for specific conditions when a user selects the "back" button from a navigation controller - then display an alert and stop the pop up the navigation stack from occurring.

我可以在viewWillDissappear方法中得到通知，即将发生流行音乐-但是是否有一种机制可以阻止流行音乐的发生？

I can get notified in the viewWillDissappear method that the pop is about to occur - but is there a mechanism to stop the pop from happening?

推荐答案

您可以尝试对UINavigationController进行子类化，然后重写popViewController方法以包含您的逻辑。

You can try subclassing UINavigationController and then override the popViewController method to include your logic.

- (UIViewController *)popViewControllerAnimated:(BOOL)animated

http ：//www.hanspinckaers.com/custom-action-on-back-button-uinavigationcontroller

干杯，
Rog

Cheers, Rog

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