ExactLengthRule

public class ExactLengthRule : ValidationRule<String>

ExactLengthRule is a subclass of ValidationRule that is used to make sure a the value has an exact length.


                    
                    
                    init(length:message:)

Initializes an ExactLengthRule object to validate the text of a field against an exact length.

Swift

public init(length: Int, message: String = "")

`length`	Integer value of exact string length being specified.
`message`	String of error message.

An initialized ExactLengthRule object, or nil if an object could not be created for some reason. that would not result in an exception.


                    
                    
                    validate(_:)

Used to validate length of string.

Swift

public override func validate(_ value: String?) -> String?


                                value

Any value to be checked for validation.

Error Message. nil if validation is successful; String if validation fails.