NSStringSize.m

NSFont *font = [NSFontsystemFontOfSize:14.0];
NSShadow *textShadow = [[NSShadowalloc] init];
[textShadow setShadowColor:[NSColorcolor whiteColor]];
[textShadow setShadowOffset:CGSizeMake(0, -1.0)];
  
NSDictionary *attrsDictionary = [NSDictionary dictionaryWithObjects:[NSArrayarrayWithObjects:font, textShadow, nil] 
                                                                forKeys:[NSArrayarrayWithObjects:NSFontAttributeName, NSShadowAttributeName, nil]];
CGSize size =  [@"string" sizeWithAttributes:attrsDictionary];