UIScrollView

스크롤을 최하단으로 이동

[self.scroll setContentSize:CGSizeMake(self.view.frame.size.width, self.scroll.frame.size.height + keyboardHeight)];
CGPoint bottom = CGPointMake(0, self.scroll.contentSize.height - self.view.bounds.size.height + self.scroll.contentInset.bottom);
if (bottom.y > 0) {
  [self.scroll setContentOffset:bottom animated:YES];
}