如果判断NSScrollView滚动到了最后

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 ;
        }
    }
}