TextKit 2 Reference

Complete reference for TextKit 2 covering architecture, migration from TextKit 1, Writing Tools integration, and SwiftUI TextEditor with AttributedString through iOS 26.

Architecture

TextKit 2 uses MVC pattern with new classes optimized for correctness, safety, and performance.

Model Layer

NSTextContentManager (abstract)

• Generates NSTextElement objects from backing store
• Tracks element ranges within document
• Default implementation: NSTextContentStorage

NSTextContentStorage

• Uses NSTextStorage as backing store
• Automatically divides content into NSTextParagraph elements
• Generates updated elements when text changes