身份证数字校验

写了这么多代码了,原来身份证是有规律的………………

+ (BOOL)checkIDCard:(NSString *)sPaperId
{
    //判断位数
    if (sPaperId.length != 15 && sPaperId.length != 18)
    {
        return NO;
    }
    NSString *carid = sPaperId;
    long lSumQT = 0 ;
    //加权因子
    int R[] = {7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2};
    //校验码
    unsigned char sChecker[11] = {'1','0','X','9','8','7','6','5','4','3','2'};
    //将15位身份证号转换为18位
    NSMutableString *mString = [NSMutableString stringWithString:sPaperId];
    if (sPaperId.length == 15)
    {
        //一代身份证,大多数是20世纪出生的,估计是
        [mString insertString:@"19" atIndex:6];
        long p =0;
        //        const char *pid = [mString UTF8String];
        for (int i =0; i<17; i++)
        {
            NSString * s = [mString substringWithRange:NSMakeRange(i, 1)];
            p += [s intValue] * R[i];
            //            p += (long)(pid-48) * R;//
            
        }
        int o = p%11;
        NSString *string_content = [NSString stringWithFormat:@"%c",sChecker[o]];
        [mString insertString:string_content atIndex:[mString length]];
        carid = mString;
    }
    //判断地区码
    NSString *sProvince = [carid substringToIndex:2];
    NSLog(@"sProvince = %@",sProvince);
    if (![self isAreaCode:sProvince])
    {
        return NO ;
    }
    //判断年月日是否有效
    //年份
    int strYear = [[self getStringWithRange:carid Value1:6 Value2:4] intValue];
    //月份
    int strMonth = [[self getStringWithRange:carid Value1:10 Value2:2] intValue];
    //日
    int strDay = [[self getStringWithRange:carid Value1:12 Value2:2] intValue];
    NSTimeZone *localZone = [NSTimeZone localTimeZone];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
    [dateFormatter setTimeStyle:NSDateFormatterNoStyle];
    [dateFormatter setTimeZone:localZone];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSDate *date = [dateFormatter dateFromString:[NSString stringWithFormat:@"%d-%d-%d 12:01:01",strYear,strMonth,strDay]];
    if (date == nil) {
        return NO;
    }
    [carid uppercaseString];
    const char *PaperId = [carid UTF8String];
    //检验长度
    if (18 != strlen(PaperId))
    {
        return NO;
    }
    //校验数字
    NSString * lst = [carid substringFromIndex:carid.length-1];
    char di = [carid characterAtIndex:carid.length-1];
    
    if (!isdigit(di))
    {
        if ([lst.uppercaseString isEqualToString:@"X"])
        {
            
        }else
        {
            return NO;
        }
    }
    //验证最末的校验码
    lSumQT = 0;
    for (int i = 0; i<17; i++)
    {
        NSString * s = [carid substringWithRange:NSMakeRange(i, 1)];
        lSumQT += [s intValue] * R[i];
    }
    if (sChecker[lSumQT%11] != PaperId[17])
    {
        return NO;
    }
    return YES;
} 
@"11",//北京市|110000,
@"12",//天津市|120000,
@"13",//河北省|130000,
@"14",//山西省|140000,
@"15",//内蒙古自治区|150000,
@"21",//辽宁省|210000,
@"22",//吉林省|220000,
@"23",//黑龙江省|230000,
@"31",//上海市|310000,
@"32",//江苏省|320000,
@"33",//浙江省|330000,
@"34",//安徽省|340000,
@"35",//福建省|350000,
@"36",//江西省|360000,
@"37",//山东省|370000,
@"41",//河南省|410000,
@"42",//湖北省|420000,
@"43",//湖南省|430000,
@"44",//广东省|440000,
@"45",//广西壮族自治区|450000,
@"46",//海南省|460000,
@"50",//重庆市|500000,
@"51",//四川省|510000,
@"52",//贵州省|520000,
@"53",//云南省|530000,
@"54",//西藏自治区|540000,
@"61",//陕西省|610000,
@"62",//甘肃省|620000,
@"63",//青海省|630000,
@"64",//宁夏回族自治区|640000,
@"65",//新疆维吾尔自治区|650000,
@"71",//台湾省(886)|710000,
@"81",//香港特别行政区(852)|810000,
@"82",//澳门特别行政区(853)|820000
@"91",//国外

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