Color+RawRepresentable.swift

import Foundation
import SwiftUI
import UIKit

extension Color: RawRepresentable {

    public init?(rawValue: String) {
        
        guard let data = Data(base64Encoded: rawValue) else{
            self = .black
            return
        }
        
        do{
            let color = try NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(data) as? UIColor ?? .black
            self = Color(color)
        }catch{
            self = .black
        }
        
    }

    public var rawValue: String {
        
        do{
            let data = try NSKeyedArchiver.archivedData(withRootObject: UIColor(self), requiringSecureCoding: false) as Data
            return data.base64EncodedString()
            
        }catch{
            
            return ""
            
        }
        
    }

}

Thank you! here a little simplified and updated code:

extension Color: RawRepresentable {
    public init?(rawValue: String) {
        guard let data = Data(base64Encoded: rawValue),
              let color = try? NSKeyedUnarchiver.unarchivedObject(ofClass: UIColor.self, from: data) else {
            return nil
        }
        self = Color(color)
    }

    public var rawValue: String {
        let data = try? NSKeyedArchiver.archivedData(
          withRootObject: UIColor(self), requiringSecureCoding: false)
        return data?.base64EncodedString() ?? ""
    }
}