Question

If a viewController is in a navigationStack(probably top of stack),
does it automatically possess self.navigationItem?

I keep seeing self.navigationItem and self.navigationController without much context in questions and tutorials, and wonder where that variables are set.

• edit

Wow thanks for the fast answers.
Where would I have spotted the info(about self.navigationItem) in the official doc?

Answer 1

Yes if its in a stack it does have a self.navigationItem, if its not in a navigation stack self.navigationItem would equal to nil

This property is defined in an objective c class extension

@interface UIViewController (UINavigationControllerItem)

it defines the properties of UIViewController related to the navigation controller