Core Text

Core Text is a Core Foundation style API in macOS, first introduced in Mac OS X 10.4 Tiger, made public in Mac OS X 10.5 Leopard, and introduced for the iPad with iPhone SDK 3.2. Exposing a C API, it replaces the text rendering abilities of the now-deprecated QuickDraw and ATSUI frameworks in previous versions of Mac OS X. According to Apple, Core Text is "designed for high performance and ease of use" and its layout API is "simple, consistent, and tightly integrated with Core Foundation, Core Graphics, and Cocoa."

Features
Core Text provides the following opaque types:
 * CTFramesetter - creates CTFrame objects from given attributed string object and CGPath object using CTTypesetter.
 * CTTypesetter - performs line layouts; e.g., line breaking
 * CTFrame - represents an array of lines (i.e., CTLine objects).
 * CTLine - represents an array of glyph runs.
 * CTRun - an ordered collection of glyphs sharing the same attribute.
 * CTFont - represents a font.

Example
The following code displays the text "Hello, World!" to the given graphics context in Objective-C.