评论自动移动到cell体验

-(void)inputViewDidShow:(WLCommentInputView *)CommentView orginY:(CGFloat)orginY{
    CGRect rectInTableView = [self.tableView rectForRowAtIndexPath:_commentIndexPath];
    CGRect rect = [self.tableView convertRect:rectInTableView toView:[self.tableView superview]];
    CGFloat maxY = CGRectGetMaxY(rect);
    CGPoint point = self.tableView.contentOffset;
    point.y -= (orginY - maxY);
    [self.tableView setContentOffset:point animated:YES];
}