Inserts a specified child view controller into the
childViewControllers array at a specified position.
The index in the
childViewControllers array at which to insert the child view controller. This value must not be greater than the count of elements in the array.
You should instead use the
addChildViewController: method unless you want to perform work on child view controllers as you add them. In that case, override this method to perform that work.
If a child view controller has a different parent when you call this method, the child is first be removed from its existing parent by calling the child’s
Managing Child View Controllers in a Custom Container
A convenience method for adding a child view controller at the end of the
An array of view controllers that are hierarchical children of the view controller.