Vertical-Text-iOS
This project demonstrates how to render vertical text in iOS. It is vaguely inspired by the sample code TextLayoutDemo for OS X.
Features:
- Renders using TextKit, so handles all the text layout features available in iOS: kerning, hypenation, control and invisible characters, rich text support...
- Text direction/orientation modifications are easy to make.
- Doesn't support text selection yet. It renders in a UIView instead of a UITextView. Please, help with that.
- There is no scrolling yet, but that shouldn't be difficult.
Key concepts
The class NSTextContainer handles the rect of each line. We subclassed it.
I tried subclassing UITextView to control the rendering, but it was a mess. So for demonstration purposes, I implemented a custom UIView applying some affine transformations to each line of text vertically readable from top-left to bottom-right.
MIT License
Santi González