UINavigationController 和后退按钮操作 [英] UINavigationController and back button action

问题描述

我有两个 controllers 第一个是 self，第二个是 maincontroller，我正在推 maincontroller在 stack 中，所以后退按钮会自动出现.

I have an two controllers 1st is self and 2nd is maincontroller, where I'm pushing maincontroller in stack, so the back button is automatically coming.

这里我需要在用户按下后退按钮时发出警报.

Here I need to make an alert when the user presses the back button.

我该怎么做?

推荐答案

或者你可以使用 UINavigationController 的委托方法.方法 willShowViewController 在你的 VC 的后退按钮被按下时被调用.

Or you can use the UINavigationController's delegate methods. The method willShowViewController is called when the back button of your VC is pressed.

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated;

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