NSAttributedString Writing Direction

Question

I am trying to change the write direction in an NSAttributedString. However, I have a really hard time figuring out how to do it.

CTFontRef fontRef = CTFontC         


        

Answer 1

I read more carefully the doc.

I'll use NSFontAttributeName and NSWritingDirectionAttributeName since I'm more confortable with them than using all the bridge stuff, and also shorthand syntax.

So NSWritingDirectionAttributeName waits for a NSArray of NSNumbers. That was the issue. One of theses numbers must be a NSWritingDirection (LeftToRight or RightToLeft), and the other a NSTextWritingDirection (Embedding or Override).

So, the combinations possibles are (and I think you're looking for the forth one):

NSDictionary *attrDictionary = @{NSFontAttributeName:font,
                                 NSWritingDirectionAttributeName:@[@(NSWritingDirectionRightToLeft | NSTextWritingDirectionOverride)]};

NSDictionary *attrDictionary = @{NSFontAttributeName:font,
                                 NSWritingDirectionAttributeName:@[@(NSWritingDirectionLeftToRight | NSTextWritingDirectionEmbedding)]};

NSDictionary *attrDictionary = @{NSFontAttributeName:font,
                                 NSWritingDirectionAttributeName:@[@(NSWritingDirectionLeftToRight | NSTextWritingDirectionOverride)]};

NSDictionary *attrDictionary = @{NSFontAttributeName:font,
                                 NSWritingDirectionAttributeName:@[@(NSWritingDirectionRightToLeft | NSTextWritingDirectionOverride)]};

Source: Documentation of NSWritingDirectionAttributeName