Added Validator.

[Matic1993]

Added some default validation.

User can also add custom regex for validation.

[k0nserv]

Hey @Matic1993,

I think this should be more general. Instead of having a single protocol with many checks it should be a protocol with a single unified interface.

typealias Valdiator = (text: String) -> (Bool, String)?

and then concrete implementation of validators that have the above signature for example

func validateAlphabeticalValue(text: String) -> (Bool, String)? {
    let valid = !text!.isEmpty && text!.rangeOfCharacter(from: CharacterSet.letters.inverted) == nil;

    guard valid else {
        return (false, "Invalid number")
    }

    return nil
}

[Matic1993]

Hey @k0nserv

thank you for your suggestion - do you know for any tutorial where I can check your idea?

I will implement your suggestion.

Thank you for your help.

[k0nserv]

So the idea is that each instance of SkyFloatingLabelTextField will have an optional validator function(Validator?).

typealias Validator = (_ text: String) -> ValidationResult

ValidationResult is just a simple enum encapsulating either that the value is valid or an error with a string to describe the error.

enum ValidationResult {
    case ok
    case error(String)
}

Everytime the text changes we can run the Validator if it exists and then set the errorMessage as appropriate. We need to make sure we listen to text changes in a transparent way that still lets the consumer set a custom delegate. See attached playground

Validator.playground.zip

[k0nserv]

Closing due to inactivity. Feel free to reopen or open a new PR if you wish to continue working on this