viewControllers
The view controllers currently on the navigation stack.
Declaration
var viewControllers: [UIViewController] { get set }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.
Assigning a new array of view controllers to this property is equivalent to calling the setViewControllers(_:animated:) method with the animated parameter set to false.