Open Source Apple iPhone Text Editors

HarfBuzz is an open source text-shaping engine with a C API that turns fonts and strings of character codes into a form that is correctly arranged for the corresponding language and writing system. This is essentially the process of text shaping: translating a string of character codes into a properly arranged sequence of glyphs that can be rendered onto a screen or into final output form for inclusion in a document. This shaping depends on a number of factors: the input string, the active font, the script (or writing system) of the string, and the string's language. Various font formats have their own set of standard text-shaping rules. With Harfbuzz, you can properly shape all the major writing systems. HarfBuzz is cross-platform and supports all major software platforms and font formats.

Draft.js is a framework for building rich text editors in React, powered by an immutable model and abstracting over cross-browser differences. Draft.js allows you to build any type of rich text input, whether you're only looking to support a few inline text styles or building a complex text editor for composing long-form articles. We provide the building blocks to enable the creation of a broad variety of rich text composition experiences, from basic text styles to embedded media. Draft.js fits seamlessly into React applications, abstracting away the details of rendering, selection, and input behavior with a familiar declarative API. The Draft.js model is built with immutable-js, offering an API with functional state updates and aggressively leveraging data persistence for scalable memory usage.

Performant plain text editor for iOS with syntax highlighting, line numbers, invisible characters and much more. Runestone uses GitHub's Tree-sitter to parse code to a syntax tree which is used for features that require an understanding of the code in the editor, for example syntax highlighting. Highlight ranges in the text view. Search the text using regular expressions. Automatically detects if a file is using spaces or tabs for indentation. Specify line endings (CR, LF, CRLF) to use when inserting a line break. Automatically detect line endings in a text. When judging the performance of Runestone, it is key to build your app in the release configuration. The optimizations applied by the compiler when using the release configuration becomes very apparent when opening large documents. The project should mostly work with Catalyst on the Mac, however, it isn't fully tested and the implementation isn't considered done. The focus is currently on the iPhone and iPad.

A drop-in replacement for UILabel that supports attributes, data detectors, links, and more. TTTAttributedLabel provides a simple way to performantly render attributed strings. As a bonus, it also supports link embedding, both automatically with NSTextCheckingTypes and manually by specifying a range for a URL, address, phone number, event, or transit information. It also includes advanced paragraph style properties. As of version 1.10.0, TTTAttributedLabel supports VoiceOver through the UIAccessibilityElement protocol. Each link can be individually selected, with an accessibilityLabel equal to its string value, and a corresponding accessibilityValue for URL, phone number, and date links. Developers who wish to change this behavior or provide custom values should create a subclass and override accessibilityElements. TTTAttributedLabel can display both plain and attributed text: just pass an NSString or NSAttributedString to the setText: setter.

Powerful text framework for iOS to display and edit rich text. YYText is a component of YYKit. YYText is UILabel and UITextView API compatible. High performance asynchronous text layout and rendering, extended CoreText attributes with more text effects. Text attachments with UIImage, UIView and CALayer. Custom highlight text range to allow user interact with, text parser support (built in markdown/emoticon parser), text container path and exclusion paths support. Vertical form layout support (for CJK text). Image and attributed text copy/paste support, attributed text placeholder support, custom keyboard view support. Undo and redo control. Attributed text archiver and unarchiver support, multi-language and VoiceOver support, interface Builder support, and fully documented.