强密码

Question

我正在开发一个与货币交易相关的应用程序。因此，在用户注册屏幕中，我想对密码字段强加限制。

这里，要求是，

1）密码必须是一个小写字母，一个大写字母，一个特殊字符 （包括所有类型的特殊字符。） 。

2）空格和数字不是强制性的，但如果用户想要输入则接受它，

3）密码长度必须大于6 char。

低于我的所作所为。

-(BOOL) isPasswordValid:(NSString *)pwd
{
    NSString *password = pwd;
    NSLog(@"Password ==> %@",pwd);
    NSString *scPattern = @"[a-z]";
    NSString *cPattern = @"[A-Z]";

    // !~`@#$%^&*-+();:={}[],\'.<>?\\/\"  
   // @"[@!%&\._;,]" 

    NSString *sPattern = @"^\\w+( +\\w+)*$";

    if ((6 <= password.length) && [self string:password matches:scPattern] && [self string:password matches:cPattern] && [self string:password matches:sPattern])
    {
        return YES;
    }
    else
        return NO;
}

我在上面调用函数

if([self isPasswordValid])
{
 /// Your password is valid;
}
else
{
/// Your password is not valid
}

当我输入 @ Aa123#" 时，但每次我 /// Your password is not valid

任何人都知道如何获得预期结果？通过正则表达式或任何其他技巧？

感谢。

Answer 1

请试试这个

  -(void)textFieldDidEndEditing:(UITextField *)textField{
       int numberofCharacters = 0;
       BOOL lowerCaseLetter,upperCaseLetter,digit,specialCharacter = 0;
       if([textField.text length] >= 6)
       {
          for (int i = 0; i < [textfield.text length]; i++) 
          {
             unichar c = [textfield.text characterAtIndex:i];
             if(!lowerCaseLetter)
             {
               lowerCaseLetter = [[NSCharacterSet lowercaseLetterCharacterSet] characterIsMember:c];
             }
             if(!upperCaseLetter)
             {
               upperCaseLetter = [[NSCharacterSet uppercaseLetterCharacterSet] characterIsMember:c];
             }
             if(!digit)
             {
                digit = [[NSCharacterSet decimalDigitCharacterSet] characterIsMember:c];
             }
             if(!specialCharacter)
             {
                specialCharacter = [[NSCharacterSet symbolCharacterSet] characterIsMember:c];
             }
          }

          if(specialCharacter && digit && lowerCaseLetter && upperCaseLetter)
          {
             //do what u want
          }
          else
          { 
             UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                            message:@"Please Ensure that you have at least one lower case letter, one upper case letter, one digit and one special character"
                                                           delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [alert show];
          }

       }
       else
       {
          UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                            message:@"Please Enter at least 6 digit password"
                                                           delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [alert show];
       }
    }