奇葩代码，

  self.commentTitleLabel.frame = CGRectMake(self.commentTitleLabel.frame.origin.x, self.commentChatView.frame.origin.y - 3, self.commentTitleLabel.frame.size.width, self.commentTitleLabel.frame.size.height);

    if (info.comment.length == 0 || !info.comment | [info.comment isEqualToString:@""]) {

        self.commentChatView.frame = CGRectMake(self.commentChatView.frame.origin.x, self.commentChatView.frame.origin.y, self.commentChatView.frame.size.width, 0);

        self.commentTitleLabel.frame = CGRectMake(self.commentTitleLabel.frame.origin.x, self.commentChatView.frame.origin.y - 3, self.commentTitleLabel.frame.size.width, 0);

 

    }

又重新赋值， self.commentTitleLabel.frame.size.height（20） -----》0------》 self.commentTitleLabel.frame.size.height（0）