gistfile1.txt

- (NSTextCheckingResult *)linkAtPoint:(CGPoint)point
{
    CGRect selfBounds = self.bounds;
    static const CGFloat kVMargin = 5.0f;
	if (!CGRectContainsPoint(CGRectInset(selfBounds, 0, -kVMargin), point))
    {
        return nil;
    }
    
    [self createTextFrame];
    if (!self.textFrame)
        return 0;
    
    CFArrayRef lines = CTFrameGetLines(self.textFrame);
	if (!lines) return nil;
	CFIndex count = CFArrayGetCount(lines);
    
    NSTextCheckingResult* foundLink = nil;
    
	CGPoint origins[count];
	CTFrameGetLineOrigins(self.textFrame, CFRangeMake(0,0), origins);
    
    for (int i = 0; i < count; i++)
    {
		CGPoint linePoint = origins[i];
        
		CTLineRef line = CFArrayGetValueAtIndex(lines, i);
		CGRect flippedRect = [self getLineBounds:line point:linePoint];
        flippedRect.origin.x += contentInset.left;
        CGRect bounds = CGRectMake(CGRectGetMinX(selfBounds),
                                   CGRectGetMaxY(selfBounds)-CGRectGetMaxY(selfBounds),
                                   CGRectGetWidth(selfBounds),
                                   CGRectGetHeight(selfBounds));
        CGRect rect = CGRectMake(CGRectGetMinX(flippedRect),
                                 CGRectGetMaxY(bounds)-CGRectGetMaxY(flippedRect),
                                 CGRectGetWidth(flippedRect),
                                 CGRectGetHeight(flippedRect));                      
        
		rect = CGRectInset(rect, 0, -kVMargin);
		if (CGRectContainsPoint(rect, point))
        {
			CGPoint relativePoint = CGPointMake(point.x-CGRectGetMinX(rect),
                                                point.y-CGRectGetMinY(rect));
			CFIndex idx = CTLineGetStringIndexForPosition(line, relativePoint);
			foundLink = ([self linkAtIndex:idx]);
			if (foundLink) return foundLink;
		}
	}
	return nil;
}