Problem
You would like to directly manipulate the array of view controllers associated with a
specific navigation controller

Solution
Use the viewControllers property of the UINavigationController class to access and
modify the array of view controllers associated with a navigation controller

- (void) goBack {
/* Get the current array of View Controllers */
NSArray *currentControllers = self.navigationController.viewControllers; /* Create a mutable array out of this array */
NSMutableArray *newControllers = [NSMutableArray
arrayWithArray:currentControllers]; /* Remove the last object from the array */
[newControllers removeLastObject]; /* Assign this array to the Navigation Controller with animation */
[self.navigationController setViewControllers:newControllers
animated:YES];
}

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