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

Question

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

so I would insert code in method.

What method is called when back button clicked in

Answer 1

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

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

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

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