uitextview 最后一行遮挡

这只 uiscrollerview 的 setContentOffset

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];

//            }];

            [textView setContentOffset:offset];

        }