Resource Management

Manage the images, strings, storyboards, and nib files that you use to implement your app's interface.




An encapsulation of the design-time view controller graph represented in an Interface Builder storyboard resource file.


An object that prepares for and performs the visual transition between two view controllers.


An encapsulation of information about an unwind segue.


A handler block containing the custom initialization code for a view controller you instantiate from a storyboard.




A container for a collection of images that represent multiple ways of describing a single piece of artwork.


An object from a data set type stored in an asset catalog.

Nib Files


An object that wraps, or contains, Interface Builder nib files.

See Also

App Structure

App and Environment

Manage life-cycle events and your app’s UI scenes, and get information about traits and the environment in which your app runs.

Documents, Data, and Pasteboard

Organize your app's data and share that data on the pasteboard.

App Extensions

Extend your app's basic functionality to other parts of the system.

Inter-Process Communication

Share data through Handoff, support universal links into your app's content, and display activity-based services to the user.

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.

Learn more about using Apple's beta software