当在导航控制器中点击返回按钮时，调用哪个方法？ [英] Which method is called when back button clicked in navigation controller?

问题描述

我想在导航控制器中点击后退按钮时保存数据库。

I want to save DB when the back button clicked in navigation controller.

因此我会在方法中插入代码。

so I would insert code in method.

在导航控制器中点击返回按钮时调用什么方法？

What method is called when back button clicked in navigation controller?

推荐答案

UINavigationControllerDelegate 协议，即方法：

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

viewController参数不再是你的视图控制器然后你应该保存。

when the viewController argument is no longer your view controller then you should save.

但是，这样做在 viewWillDisappear：一个更好（更简单）的想法。

However, doing so on viewWillDisappear: might be a better (and much simpler) idea.

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