Equivalent of Fragment (Android) in iOS
Container View Controllers allow to include child view controller inside another view controller. Take a look at the docs by clicking on the "more..." link in the class overview.
Implementing a Container View Controller
A custom UIViewController subclass can also act as a container view controller. A container view controller manages the presentation of content of other view controllers it owns, also known as its child view controllers. A child's view can be presented as-is or in conjunction with views owned by the container view controller....
Using them in storyboards is as simple as dragging the Container View to your view controller.
And Xcode will automatically add a child view controller to it