TextKit

TextKit is Apple's framework for laying out, displaying and editing text in apps on iOS, macOS and other Apple platforms.

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TextKit is a text-handling framework that Apple introduced with iOS 7 in 2013. It provides text layout, display and editing, including font handling, line breaking and paragraph layout. The components that display and accept text in UIKit and AppKit use TextKit internally.

In 2021, Apple introduced TextKit 2, a redesigned version of the framework.

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One theory blamed synchronous layout rendering in TextKit, and none of the guesses fixed the problem.


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