Why isn't viewWillDisappear or viewDidAppear being called?

Question

I have a UINavigationController with a UITableView as my main menu. User clicks on a cell and a new view is pushed on the stack. In one case I push

Answer 1

Yes Its true

you can do this by first write this code in

- (void)viewDidLoad {
    self.navigationController.delegate = self;  
}

And then write the code which you want to write in viewWillAppear

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

    if ([viewController isKindOfClass:[self class]]) {
        //write your code here
    } 
}