How to identify previous view controller in navigation stack

objective-c ios uiviewcontroller uinavigationcontroller
Zhen picture Zhen · Aug 10, 2011 · Viewed 95.3k times · Source

I have 2 seperate navigationcontrollers, one with RootViewController A and the other with RootViewController B.

I am able to push ViewController C onto either A or B's navigation stack.

Question: When I am in ViewController C, how can I find out if I am in the stack belonging to A or B?

Answer

jburns20 picture jburns20 · Aug 10, 2011

You could use the UINavigationController's viewControllers property:

@property(nonatomic, copy) NSArray *viewControllers

Discussion: 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.

https://developer.apple.com/documentation/uikit/uinavigationcontroller

You could use that to test whether the root view controller (the one at array index 0) is view controller A or B.

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