转自：http://www.codexsoftware.co.uk/blog/computers/programming/how-to-determine-if-an-nstextview-is-scrolled-to-the-end/
bool
scrollToEnd = YES;id
scrollView = (NSScrollView
*)textView.superview.superview;if
([scrollView isKindOfClass:[NSScrollView
class]])
{ if
([scrollView hasVerticalScroller]) { if
(textView.frame.size.height > [scrollView frame].size.height) { if
(1.0f != [scrollView verticalScroller].floatValue) scrollToEnd
= NO; } }}