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Cocoa is Apple's native object-oriented application programming interface (API) for its desktop operating system macOS.. Cocoa consists of the Foundation Kit, Application Kit, and Core Data frameworks, as included by the Cocoa.h header file, and the libraries and frameworks included by those, such as the C standard library and the Objective-C runtime.
RubyCocoa will import the Objective-C classes into the Ruby world on demand. For example, when you access OSX::NSTableView for the very first time in your code, RubyCocoa will retrieve all the necessary information regarding this class from the Objective-C runtime and create a Ruby class of the same name that will act as a proxy.
The Cocoa text system (formerly known simply by the primary class name NSText) is the linked network of classes, protocols, interfaces and objects that provide typography and text field editing capabilities and to Cocoa applications on Apple's macOS, where it is the primary text-handling system. [1]
AppKit (formally Application Kit) [1] is a graphical user interface toolkit. It initially served as the UI framework for NeXTSTEP. [2] Along with Foundation and Display PostScript, it became one of the core parts of the OpenStep specification of APIs. Later, AppKit and Foundation became part of Cocoa, the Objective-C API framework of macOS.
UIKit is an application development environment and graphical user interface toolkit from Apple Inc. used to build apps for the iOS, iPadOS, and tvOS operating systems. [ 1 ] UIKit provides an abstraction layer of iOS, the operating system for the iPhone, iPod Touch, and iPad.
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Whereas Apple events are a way to send messages into applications, AppleScript is a particular language designed to send Apple events. In keeping with the objective of ease-of-use for beginners, the AppleScript language is designed on the natural language metaphor, just as the graphical user interface is designed on the desktop metaphor.
In addition, new services for applications are included, which include spelling and grammar checkers, special characters palette, color picker, font chooser and dictionary; these global features are present in every Cocoa application, adding consistency.