iOS 给label加下划线或者中划线_yylabel 中划线

UILabel *label1=[[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];

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

    NSMutableAttributedString *attribtStr = [[NSMutableAttributedString alloc]initWithString:@"下划线" attributes:attribtDic];