label添加中划线

 label.text = [NSString stringWithFormat:@"原价:¥%@",_forePrice];

NSDictionary*attribtDic=@{NSStrikethroughStyleAttributeName:[NSNumber numberWithInteger:NSUnderlineStyleSingle]};

NSMutableAttributedString*attStr=[[NSMutableAttributedString alloc]initWithString:label.text attributes:attribtDic];

label.attributedText = attStr;