Question

I have 3 viewControllers that appear in sequence, A -> B -> C

A calls B using

[self.navigationController pushViewController:controllerB animated:YES];

C calls B by

[self.navigationController popViewControllerAnimated:YES];

is there a way for B to know who called it, A or C?

thanks.

Answer 1

You can use the NavigationControllers viewControllers property. To see which items are in the navigation stack.

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.

You want the view controller at index n-2.

http://developer.apple.com/library/ios/#documentation/uikit/reference/UINavigationController_Class/Reference/Reference.html

Edit (Added Example)

NSString *previousView = NSStringFromClass([[self.navigationController.viewControllers objectAtIndex:(self.navigationController.viewControllers.count - 2)] class]);
if([previousView isEqualToString:@"SettingsViewController"]){
     // Do something
}