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.

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