#pragma mark 判斷身份證號是否合法- (BOOL)judgeIdentityStringValid:(NSString *)identityString {  if (identityString.length != 18) return NO;  // 正則表達式判斷基本 身份證號是否滿足格式  NSString *regex2 = @"^(^[1-9]//d{7}((0//d)|(1[0-2]))(([0|1|2]//d)|3[0-1])//d{3}$)|(^[1-9]//d{5}[1-9]//d{3}((0//d)|(1[0-2]))(([0|1|2]//d)|3[0-1])((//d{4})|//d{3}[Xx])$)$";  NSPredicate *identityStringPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];  //如果通過該驗證，說明身份證格式正確，但準確性還需計算  if(![identityStringPredicate evaluateWithObject:identityString]) return NO;  //** 開始進行校驗 *//  //將前17位加權因子保存在數組里  NSArray *idCardWiArray = @[@"7", @"9", @"10", @"5", @"8", @"4", @"2", @"1", @"6", @"3", @"7", @"9", @"10", @"5", @"8", @"4", @"2"];  //這是除以11后，可能產生的11位余數、驗證碼，也保存成數組  NSArray *idCardYArray = @[@"1", @"0", @"10", @"9", @"8", @"7", @"6", @"5", @"4", @"3", @"2"];  //用來保存前17位各自乖以加權因子后的總和  NSInteger idCardWiSum = 0;  for(int i = 0;i < 17;i++) {    NSInteger subStrIndex  = [[identityString substringWithRange:NSMakeRange(i, 1)] integerValue];    NSInteger idCardWiIndex = [[idCardWiArray objectAtIndex:i] integerValue];    idCardWiSum      += subStrIndex * idCardWiIndex;  }  //計算出校驗碼所在數組的位置  NSInteger idCardMod=idCardWiSum%11;  //得到最后一位身份證號碼  NSString *idCardLast= [identityString substringWithRange:NSMakeRange(17, 1)];  //如果等于2，則說明校驗碼是10，身份證號碼最后一位應該是X  if(idCardMod==2) {    if(![idCardLast isEqualToString:@"X"]||[idCardLast isEqualToString:@"x"]) {      return NO;    }  }else{    //用計算出的驗證碼與最后一位身份證號碼匹配，如果一致，說明通過，否則是無效的身份證號碼    if(![idCardLast isEqualToString: [idCardYArray objectAtIndex:idCardMod]]) {      return NO;    }  }  return YES;}

#pragma mark 判斷銀行卡號是否合法-(BOOL)isBankCard:(NSString *)cardNumber{  if(cardNumber.length==0){    return NO;  }  NSString *digitsOnly = @"";  char c;  for (int i = 0; i < cardNumber.length; i++){    c = [cardNumber characterAtIndex:i];    if (isdigit(c)){      digitsOnly =[digitsOnly stringByAppendingFormat:@"%c",c];    }  }  int sum = 0;  int digit = 0;  int addend = 0;  BOOL timesTwo = false;  for (NSInteger i = digitsOnly.length - 1; i >= 0; i--){    digit = [digitsOnly characterAtIndex:i] - '0';    if (timesTwo){      addend = digit * 2;      if (addend > 9) {        addend -= 9;      }    }    else {      addend = digit;    }    sum += addend;    timesTwo = !timesTwo;  }  int modulus = sum % 10;  return modulus == 0;}