Interface Builder
Interface Builder is a visual design tool integrated into Xcode for creating user interfaces (UIs) for macOS, iOS, iPadOS, watchOS, and tvOS applications. It allows developers to drag and drop UI elements like buttons, labels, and views onto a canvas, configure their properties, and define layout constraints without writing code. The tool generates XML-based storyboard or XIB files that describe the UI, which are then compiled and integrated into the app at runtime.
Developers should learn Interface Builder when building native Apple platform apps (iOS, macOS, etc.) using Swift or Objective-C, as it streamlines UI development by providing a visual, WYSIWYG editor that reduces boilerplate code and speeds up prototyping. It is particularly useful for creating complex layouts with Auto Layout constraints, managing view hierarchies, and designing adaptive interfaces for different screen sizes and orientations. However, for highly dynamic or programmatic UIs, developers might prefer code-based approaches.