Find index of tapped character in UILabel

gistfile1.txt

-(NSInteger)indexOfTappedCharacterWithTapGesture:(UITapGestureRecognizer *)tapGesture
{
    CGPoint location = [tapGesture locationInView:self];

    // init text storage
    NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString: self.attributedText];
    NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
    [textStorage addLayoutManager:layoutManager];

    // init text container
//    NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:CGSizeMake(self.frame.size.width, self.frame.size.height+100) ];
    NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:CGSizeMake(self.frame.size.width, self.frame.size.height) ];
    textContainer.lineFragmentPadding  = 0;
    textContainer.maximumNumberOfLines = self.numberOfLines;
    textContainer.lineBreakMode        = self.lineBreakMode;

    [layoutManager addTextContainer:textContainer];

    NSInteger characterIndex = [layoutManager characterIndexForPoint: location
                                                  inTextContainer:textContainer
                         fractionOfDistanceBetweenInsertionPoints:NULL];
    return characterIndex;
}