Do you memorize the classes of your frameworks?

I've been an iOS developer for about 5 years. There are still things that NSString and NSArray do that I didn't know they could. All optional attributes and behaviors that I haven't seen, because I've never actually sat down and memorized all of the optionals and capabilities of the NSString class. I know the most of the basic stuff off the top of my head, but I typically google for the fastest way to do it if I can't on the fly. My question is: Do you guys have most of the classes of your most commonly used frameworks memorized? (For me it would be Cocoa Touch). Does this have any effect on the classification of "level" of programmer you are? Technically I'm a senior and do well at my job but the above makes me wonder... Who's on the same page, if anyone?