For this purpose, Tab Bar Controllers are used. It is a container view controller that manages an array of view controllers in a radio-style selection interface so that the user can interact with the interface to determine the view controller to display. It is the instance of UITabBarController, which inherits UIViewController.
class UITabBarController : UIViewController
In the tab bar interface, a tab bar is displayed at the bottom of the screen with multiple tab bar button items for selecting between different modes of the application
