在导航控制器中单击后退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单击后退按钮时保存数据库.

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

所以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后退按钮会调用什么方法?

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

推荐答案

做你问的，看UINavigationControllerDelegate协议，即方法:

To do what you asked, look at the UINavigationControllerDelegate protocol, namely the method:

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

当 viewController 参数不再是你的视图控制器时，你应该保存.

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

然而，在 viewWillDisappear: 上这样做可能是一个更好(也更简单)的想法.

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

这篇关于在导航控制器中单击后退按钮时调用哪个方法?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！