iOS 身份证验证

- （void）onClickButton:(id) sender{
if (tmp_txt.text.length ==  || tmp_txt.text.length == ) {
                NSString *emailRegex = @"^[0-9]*$";
                NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
                bool sfzNo = [emailTest evaluateWithObject:[tmp_txt.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]];

                if (tmp_txt.text.length == ) {
                    if (!sfzNo) {
                        [self HUDShow:@"请输入正确的身份证号" delay:1.5];
                        return NO;
                    }
                }
                else if (tmp_txt.text.length == ) {
                    bool sfz18NO = [Global checkIdentityCardNo:tmp_txt.text];
                    if (!sfz18NO) {
                        [self HUDShow:@"请输入正确的身份证号" delay:1.5];
                        return NO;
                    }
                }
            }else{
                [self HUDShow:@"请输入正确的身份证号" delay:1.5];
                return NO;
            }
}

#pragma mark - 身份证识别
+(BOOL)checkIdentityCardNo:(NSString*)cardNo
{
    if (cardNo.length != ) {
        return  NO;
    }
    NSArray* codeArray = [NSArray arrayWithObjects:@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"", nil];
    NSDictionary* checkCodeDic = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"",@"",@"X",@"",@"",@"",@"",@"",@"",@"",@"", nil]  forKeys:[NSArray arrayWithObjects:@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"", nil]];

    NSScanner* scan = [NSScanner scannerWithString:[cardNo substringToIndex:]];

    int val;
    BOOL isNum = [scan scanInt:&val] && [scan isAtEnd];
    if (!isNum) {
        return NO;
    }
    int sumValue = ;

    for (int i =; i<; i++) {
        sumValue+=[[cardNo substringWithRange:NSMakeRange(i , ) ] intValue]* [[codeArray objectAtIndex:i] intValue];
    }

    NSString* strlast = [checkCodeDic objectForKey:[NSString stringWithFormat:@"%d",sumValue%]];

    if ([strlast isEqualToString: [[cardNo substringWithRange:NSMakeRange(, )]uppercaseString]]) {
        return YES;
    }
    return  NO;
}