gistfile1.txt

// http://stackoverflow.com/a/19277383
//
- (void)textViewDidChange:(UITextView *)textView
{
    CGRect line = [textView caretRectForPosition:textView.selectedTextRange.start];
    CGFloat overflow = line.origin.y + line.size.height
		- ( textView.contentOffset.y + textView.bounds.size.height
		- textView.contentInset.bottom - textView.contentInset.top );
    if (overflow > 0) {
        // We are at the bottom of the visible text and introduced a line feed, scroll down (iOS 7 does not do it)
        // Scroll caret to visible area
        CGPoint offset = textView.contentOffset;
        offset.y += overflow + 7; // leave 7 pixels margin
        // Cannot animate with setContentOffset:animated: or caret will not appear
        [UIView animateWithDuration:.2 animations:^{
            [textView setContentOffset:offset];
        }];
    }
}