Описание тега xcode-storyboard
A storyboard is composed of a sequence of scenes, each of which represents a view controller and its views; scenes are connected by segue objects, which represent a transition between two view controllers. Since iOS 9 and Xcode 7 we can keep reference to another storyboards.
Xcode provides a visual editor for storyboards, where developer can lay out and design the user interface of the application by adding views such as buttons, table views, and text views onto scenes. In addition, a storyboard enables a developer to connect a view to its controller object, and to manage the transfer of data between view controllers. Using storyboards is the recommended way to design the user interface of the application because they enable developer to visualize the appearance and flow of the user interface on one canvas.