A Container View can be easily added into a storyboard through Interface Editor. When added, a Container View is of a placeholder view, an embed segue, and a (child) view controller.
However, I am not able to find a way to add a Container View programmatically. Actually, I am not even able to find a class named UIContainerView or so.
A name for the class of Container View is surely a good start. A complete guide including the segue will be much appreciated.