NSAttributedString end of first line indent

Question

I want to have the first line in an NSAttributedString for a UITextView indented from the right side on the first line.

So the firstLineHeadIndent in NSParagraphStyle will indent the first line from the left. I want to do the same thing but from the right in my UITextView.

Here's a screenshot of how I want the text to wrap.

Answer 1

The Setting Text Margins article from the Text System User Interface Layer Programming Guide has this figure:

As you can see, there's no built-in mechanism to have a first line tail indent.

However, NSTextContainer has a property exclusionPaths which represents parts of its rectangular area from which text should be excluded. So, you could add a path for the upper-right corner to prevent text from going there.

UIBezierPath* path = /* compute path for upper-right portion that you want to exclude */;
NSMutableArray* paths = [textView.textContainer.exclusionPaths mutableCopy];
[paths addObject:path];
textView.textContainer.exclusionPaths = paths;