- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    NSString *sex=[self sexStrFromIdentityCard:@"139876456767892345"];

    NSLog(@"--sex--%@",sex);

}

//由身份证号返回为性别

-(NSString *)sexStrFromIdentityCard:(NSString *)numberStr{

    NSString *result = nil;

    BOOL isAllNumber = YES;

    if([numberStr length]<17)

        return result;

    //**截取第17为性别识别符

    NSString *fontNumer = [numberStr substringWithRange:NSMakeRange(16, 1)];

    //**检测是否是数字;

    const char *str = [fontNumer UTF8String];

    const char *p = str;

    while (*p!='\0') {

        if(!(*p>='0'&&*p<='9'))

            isAllNumber = NO;

        p++;

    }

    if(!isAllNumber)

        return result;

    int sexNumber = [fontNumer integerValue];

    if(sexNumber%2==1)

        result = @"男";

    ///result = @"M";

    else if (sexNumber%2==0)

        result = @"女";

    //result = @"F";

    return result;

}

2015-10-22 10:33:38.518 由身份证号码返回性别[2356:74542] --sex--女