Interface Builder is a software development application for Apple's macOS operating system. It is part of Xcode (formerly Project Builder), the Apple Developer developer's toolset. Interface Builder allows Cocoa and Carbon developers to create interfaces for applications using a graphical user interface. The resulting interface is stored as a .nib file, short for NeXT Interface Builder, or more recently, as an XML-based .xib file.
Interface Builder is descended from the NeXTSTEP development software of the same name. A version of Interface Builder is also used in the development of OpenStep software, and a very similar tool called Gorm exists for GNUstep. On March 27, 2008, a specialized iPhone version of Interface Builder allowing interface construction for iPhone applications was released with the iPhone SDK Beta 2.
Interface Builder was intentionally developed as a separate application, to allow interaction designers to design interfaces without having to use a code-oriented IDE, but as of Xcode 4, Apple has integrated its functionality directly into Xcode.
Originally the software was called SOS Interface, and was created by Jean-Marie Hullot whilst he was a researcher at Inria at Rocquencourt near Paris. He was allowed to retain ownership of the software upon resigning from Inria, and spent a year working it into a fully-featured product, now named Interface Builder and distributed for Macintosh by ExperTelligence in the USA in 1986. It was written in Lisp (for the ExperLisp product by ExperTelligence). It was invented and developed by Jean-Marie Hullot using the object-oriented features in ExperLisp, and deeply integrated with the Macintosh Toolbox. Interface Builder was presented at MacWorld Expo in San Francisco in January 1987.
Denison Bollay took Jean-Marie Hullot to NeXT after MacWorld Expo to demonstrate it to Steve Jobs. Jobs recognized its value, and started incorporating it into NeXTSTEP, and by 1988 it was part of NeXTSTEP 0.8.
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