//用戶名
+ (BOOL) validateUserName:(NSString *)name
{
 NSString *userNameRegex = @"^[A-Za-z0-9]{3,20}+$";
 NSPredicate *userNamePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",userNameRegex];
 BOOL B = [userNamePredicate evaluateWithObject:name];
 return B;
}
//密碼
+ (BOOL) validatePassword:(NSString *)passWord
{
 NSString *passWordRegex = @"^[a-zA-Z0-9]{6,20}+$";
 NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",passWordRegex];
 return [passWordPredicate evaluateWithObject:passWord];
}
//判斷手機號碼格式是否正確
+ (BOOL)valiMobile:(NSString *)mobile
{
 mobile = [mobile stringByReplacingOccurrencesOfString:@" " withString:@""];
 if (mobile.length != 11)
 {
  return NO;
 }else{
  /**
   * 移動號段正則表達式
   */
  NSString *CM_NUM = @"^((13[4-9])|(147)|(15[0-2,7-9])|(178)|(18[2-4,7-8]))\\d{8}|(1705)\\d{7}$";
  /**
   * 聯通號段正則表達式
   */
  NSString *CU_NUM = @"^((13[0-2])|(145)|(15[5-6])|(176)|(18[5,6]))\\d{8}|(1709)\\d{7}$";
  /**
   * 電信號段正則表達式
   */
  NSString *CT_NUM = @"^((133)|(153)|(177)|(18[0,1,9]))\\d{8}$";
  NSPredicate *pred1 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM_NUM];
  BOOL isMatch1 = [pred1 evaluateWithObject:mobile];
  NSPredicate *pred2 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU_NUM];
  BOOL isMatch2 = [pred2 evaluateWithObject:mobile];
  NSPredicate *pred3 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT_NUM];
  BOOL isMatch3 = [pred3 evaluateWithObject:mobile];
  if (isMatch1 || isMatch2 || isMatch3) {
   return YES;
  }else{
   return NO;
  }
 }
}
/**
 * 驗證身份證號碼是否正確的方法
 *
 * @param IDNumber 傳進身份證號碼字符串
 *
 * @return 返回YES或NO表示該身份證號碼是否符合國家標準
 */
+ (BOOL)isCorrect:(NSString *)IDNumber
{
 NSMutableArray *IDArray = [NSMutableArray array];
 // 遍歷身份證字符串,存入數組中
 if (IDNumber.length == 18) {
  for (int i = 0; i  18; i++) {
   NSRange range = NSMakeRange(i, 1);
   NSString *subString = [IDNumber substringWithRange:range];
   [IDArray addObject:subString];
  }
 }else{
  for (int i = 0; i  15; i++) {
   NSRange range = NSMakeRange(i, 1);
   NSString *subString = [IDNumber substringWithRange:range];
   [IDArray addObject:subString];
  }
 }
 // 系數數組
 NSArray *coefficientArray = [NSArray arrayWithObjects:@"7", @"9", @"10", @"5", @"8", @"4", @"2", @"1", @"6", @"3", @"7", @"9", @"10", @"5", @"8", @"4", @"2", nil];
 // 余數數組
 NSArray *remainderArray = [NSArray arrayWithObjects:@"1", @"0", @"X", @"9", @"8", @"7", @"6", @"5", @"4", @"3", @"2", nil];
 // 每一位身份證號碼和對應系數相乘之后相加所得的和
 int sum = 0;
 if (IDNumber.length == 18) {
  for (int i = 0; i  17; i++) {
   int coefficient = [coefficientArray[i] intValue];
   int ID = [IDArray[i] intValue];
   sum += coefficient * ID;
  }
 }else{
  for (int i = 0; i  14; i++) {
   int coefficient = [coefficientArray[i] intValue];
   int ID = [IDArray[i] intValue];
   sum += coefficient * ID;
  }
 }
 // 這個和除以11的余數對應的數
 NSString *str = remainderArray[(sum % 11)];
 // 身份證號碼最后一位
 NSString *string;
 if (IDNumber.length == 18) {
  string = [IDNumber substringFromIndex:17];
 }else{
  string = [IDNumber substringFromIndex:14];
 }
 // 如果這個數字和身份證最后一位相同,則符合國家標準,返回YES
 if ([str isEqualToString:string]) {
  return YES;
 } else {
  return NO;
 }
}