密码验证UITextField在iOS

Question

我在iPhone应用程序中有1UITextfield密码。

我想用下面的验证来验证这个文本字段。

• 必须至少为 10 个字符
• 必须至少包含一个小写字母、一个大写字母、一个数字和一个特殊字符
• 有效的特殊字符是 – @#$%^

如何限制具有上述要求的UITextField？




Answer 1

条件：密码应至少包含8个字符，1个大写字母和1个数字

Swift 3中的解决方案

可以这样编写String Extension，

extension String {
    func isValidPassword() -> Bool {
        let regularExpression = "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[$@$!%*?&])[A-Za-z\\d$@$!%*?&]{8,}"
        let passwordValidation = NSPredicate.init(format: "SELF MATCHES %@", regularExpression)

        return passwordValidation.evaluate(with: self)
    }
}

//Example 1

var password = "@Abcdef011" //string from UITextField (Password)
password.isValidPassword() // -> true

//Example 2

var password = "Abcdef011" //string from UITextField 
password.isValidPassword() // -> false

或者你可以像这样编写函数，

func validate(password: String) -> Bool
{
    let regularExpression = "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[$@$!%*?&])[A-Za-z\\d$@$!%*?&]{8,}"

    let passwordValidation = NSPredicate.init(format: "SELF MATCHES %@", regularExpression)

    return passwordValidation.evaluate(with: password)
}

这会给你同样的结果。

Answer 2

您也可以使用Regex来执行此操作。以下是我为您提供的几个示例：

// *** Validation for Password ***

    // "^(?=.*[A-Za-z])(?=.*\\d)[A-Za-z\\d]{8,}$" --> (Minimum 8 characters at least 1 Alphabet and 1 Number)
    // "^(?=.*[A-Za-z])(?=.*\\d)(?=.*[$@$!%*#?&])[A-Za-z\\d$@$!%*#?&]{8,16}$" --> (Minimum 8 and Maximum 16 characters at least 1 Alphabet, 1 Number and 1 Special Character)
    // "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)[a-zA-Z\\d]{8,}$" --> (Minimum 8 characters at least 1 Uppercase Alphabet, 1 Lowercase Alphabet and 1 Number)
    // "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[$@$!%*?&])[A-Za-z\\d$@$!%*?&]{8,}" --> (Minimum 8 characters at least 1 Uppercase Alphabet, 1 Lowercase Alphabet, 1 Number and 1 Special Character)
    // "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[$@$!%*?&])[A-Za-z\\d$@$!%*?&]{8,10}" --> (Minimum 8 and Maximum 10 characters at least 1 Uppercase Alphabet, 1 Lowercase Alphabet, 1 Number and 1 Special Character)

列表中的第四个是您的案例，下面的代码片段显示了如何使用它：

-(BOOL)isValidPassword:(NSString *)passwordString
{
    NSString *stricterFilterString = @"^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[$@$!%*?&])[A-Za-z\\d$@$!%*?&]{10,}";
    NSPredicate *passwordTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", stricterFilterString];
    return [passwordTest evaluateWithObject:passwordString];
}

使用方法：

if(![self isValidPassword:txtPassword.text]) {
    /* Show alert: "Password must be minimum 10 characters,
       at least 1 Uppercase Alphabet, 1 Lowercase Alphabet, 
       1 Number and 1 Special Character" */
}
else {
    // Password is valid
}

Answer 3

匿名用户

我会这么做。验证应该在用户输入密码的最后完成，而不是在两者之间。我不会使用< code>NSRegularExpression。

-(void)textFieldDidEndEditing:(UITextField *)textField{
   int numberofCharacters = 0;
   BOOL lowerCaseLetter,upperCaseLetter,digit,specialCharacter = 0;
   if([textField.text length] >= 10)
   {
      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 10 password"
                                                       delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
   }
}

希望这有帮助。。。