Question

So if I am on a screen I can navigate to the next navigation screen using the pushViewController and I simply get to the next screen, with a backButton to the previous screen.

Does the previous screen , (the screen which the back button pushes us to) … does it have a name ? (Like previousViewController os something like that ) ??

My goal behind this question:

If I have 5 screens (1, 2, 3, 4, 5 respectively)… lets say I navigate from 1 -> 3, and in another case I navigate from 2 -> 3. I want to say that if the “PreviousViewController was 1” then navigate from 3 to 4 (1 -> 3 -> 4), else if the previousViewController was 2, I want to navigate to 3 to 5 (2 -> 3 -> 5)…

How do I accomplish something like that ?

Thanks !

p.s.
I know I could also try something sensible and logical with another approach and just pushViewController accordingly. But if there is a solution for checking the previousViewController, it would make my task easy and would be a great learning experience.

Answer 1

You can actually do that by using the viewControllers property of UINavigationController. This is what Apple says about it:

The root view controller is at index 0 in the array, the back view controller is at index n-2, and the top controller is at index n-1, where n is the number of items in the array.

Your “previous controller” is what Apple defines “back view controller”, corresponding to index n-2:

NSUInteger arraySize = [navController.viewControllers count];
UIViewController* prevController = [navController.viewControllers objectAtIndex:count-2];