Seeking Advice for a Right-to-Left Language Bug in Unread

This is cross-posted from this Stack Overflow question. If you know the answer I’d appreciate your help.

In Unread, I’m using the NSAttributedString UIKit Additions to draw attributed strings for article summaries in a UIView subclass. The problem I have is that despite using a value of NSWritingDirectionNatural for the baseWritingDirection property of my paragraph style, text always defaults to left-to-right.

Here’s how I form the attributed string (simplified example):

NSString *arabic = @"العاصمة الليبية لتأمينها تنفيذا لقرار المؤتمر الوطني العام. يأتي ذلك بعدما أعلن اللواء الليبي المتقاعد خليفة حفتر أنه طلب من المجلس الأعلى للقض الدولة حتى الانتخابات النيابية القادمة";

NSMutableParagraphStyle *paragraph = [[NSMutableParagraphStyle alloc] init];
paragraph.baseWritingDirection = NSWritingDirectionNatural;
paragraph.lineBreakMode = NSLineBreakByWordWrapping;

NSMutableDictionary *attributes = [[NSMutableDictionary alloc] init];
attributes[NSParagraphStyleAttributeName] = paragraph;

NSAttributedString *string = [[NSAttributedString alloc] 

And here’s how I draw the text:

- (void)drawRect:(CGRect)rect {
    [self.attributedText drawWithRect:rect 

And yet it still flows from left to right:

What am I missing?

|  22 May 2014