lable计算行高

 _introduce.text=status.introduce;

    //设置行间距
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc]initWithString:_introduce.text];;
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
    [paragraphStyle setLineSpacing:];
    [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(, _introduce.text.length)];

    _introduce.attributedText = attributedString;

    NSString *introduce=status.introduce;

    CGSize titleSize = [introduce boundingRectWithSize:CGSizeMake(KScreenWidth-, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:],NSParagraphStyleAttributeName:paragraphStyle} context:nil].size;

    CGFloat height=titleSize.height;