给label中的文字添加中间的横线

NSDictionary *attribtDic = @{NSStrikethroughStyleAttributeName:@(NSUnderlineStyleSingle),NSBaselineOffsetAttributeName:@(0)};
    NSMutableAttributedString *stringWithLine = [[NSMutableAttributedString alloc]initWithString:oprice attributes:attribtDic];
    _olgprice.attributedText = stringWithLine;