A lighter way of discovering text writing direction

Question

I want to determine the writing direction of a string so that I can render Right-to-Left languages such as Arabic correctly in a CALayer.

so I have this method

Answer 1

Since UITextAlignment is deprecated, here's an NSString category with NSWritingDirection:

- (NSWritingDirection)alignment{
    if (self.length) {
        NSArray *rightLeftLanguages = @[@"ar",@"he"];
        NSString *lang = CFBridgingRelease(CFStringTokenizerCopyBestStringLanguage((CFStringRef)self,CFRangeMake(0,self.length)));
        if ([rightLeftLanguages containsObject:lang]) {
            return NSWritingDirectionRightToLeft;
        }
    }
    return NSWritingDirectionLeftToRight;

}