Password validation in UITextField in iOS

Question

I have 1 UITextfield for password in my iPhone application.

I want to validate this textfield with the following validation.

• Must be at le

Answer 1

Swift 3

check if password is strong ?

1. length more than or equal 8
2. lowercase
3. uppercase
4. decimal Digits

5. special characters like !@#$%^&*()_-+ is optional

   Why i not use regular expression ?

   Because it's difficult to support reserved characters in regular expression syntax.

---

 func isValidated(_ password: String) -> Bool {
     var lowerCaseLetter: Bool = false
     var upperCaseLetter: Bool = false
     var digit: Bool = false
     var specialCharacter: Bool = false

     if password.characters.count  >= 8 {
         for char in password.unicodeScalars {
             if !lowerCaseLetter {
                 lowerCaseLetter = CharacterSet.lowercaseLetters.contains(char)
             }
             if !upperCaseLetter {
                 upperCaseLetter = CharacterSet.uppercaseLetters.contains(char)
             }
             if !digit {
                 digit = CharacterSet.decimalDigits.contains(char)
             }
             if !specialCharacter {
                 specialCharacter = CharacterSet.punctuationCharacters.contains(char)
             }
         }
         if specialCharacter || (digit && lowerCaseLetter && upperCaseLetter) {
             //do what u want
             return true
         }
         else {
             return false
         }
     }
     return false
 }
 let isVaildPass:Bool = isValidated("Test**00+-")
 print(isVaildPass)