Add target to stock back button in navigationBar

Question

I am setting the values of the title and back button in the UINavigationBar as follows:

self.navigationItem.title = @"Post";
[self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [[UIColor blueColor] colorWithAlphaComponent:0.75f],
                                                                  NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue" size:20]}];
[self.navigationController.navigationBar.backItem setTitle:@"Pop Pop !"];

But i am unable to add target to the backbutton. I have tried the following:

[self.navigationItem.backBarButtonItem setTarget:self];
[self.navigationItem.backBarButtonItem setAction:@selector(goBack:)];

and

self.navigationItem.backBarButtonItem.target = self;
self.navigationItem.backBarButtonItem.action = @selector(goBack:);

But my selector is not being invoked on popping the viewController.

How do I add a target to the backButton, or invoke a selector on popping the viewController ? (I have tried all possible solutions mentioned in SO, in vain)

EDIT: I would to prefer to edit the behaviour of the stock backButton, instead of setting a custom button as the backButton.

Answer 1

I have two solutions for you, giving that you cannot add a target or action to your back button:

1- Add a new barButtonItem and call it whatever and add your selector to it, and put it in the navigationItem.leftBarButtonItem. Don't forget to pop!

2- Override the viewWillDisAppear method, and do whatever you wanna do there.. if your viewcontroller doesn't direct you to another viewcontroller but the previous one...

if you have any more questions, just ask (Y)