check-ios-bus/src/MeetupId.swift

import Combine
import Foundation

enum MeetupId {
  enum Keys: String, RawRepresentable {
    case meetupIdTextApp
    case meetupIdTextUI
  }

  static func shouldFormat(_ s: String) -> String? {
    s.components(separatedBy: NSCharacterSet.decimalDigits.inverted).reduce("") { $0 + $1 }
  }

  final class MeetupIdFormatter {
      var subscriptions = Set<AnyCancellable>()

      deinit {
          /**/print("ИГР MeetupIF.DEinit")
      }

      init() {
          Bus.receive(
              &subscriptions,
              [Keys.meetupIdTextUI.rawValue],
              { [weak self] k, v in self?.handleFormatting(k, v) }
          )
          /**/print("ИГР MeetupIF.init")
      }
      
      func handleFormatting(_: String, _ value: String) {
          let out = MeetupId.shouldFormat(value)
          /**/print("ИГР MeetupIF.handleF out/dt: '\(out)'/'\(Date())'")
          Bus.Service.singleton?.send(Keys.meetupIdTextApp.rawValue, out)
      }
  }
/*
  struct V: View {
      /*@StateObject*/ var fmt = MeetupIdFormatter()
      @StateObject var txt = Bus.BindingPipe("", Keys.meetupIdTextApp.rawValue, Keys.meetupIdTextUI.rawValue)
      
      var body: some View {
          VStack {
              Text("Hi, the text is: '\(txt.value)'")
                  .fontWeight(.bold)
              TextField("Placeholder", text: $txt.value)
                  .padding(8)
                  .border(Color.blue, width: 2)
          }
          .frame(width: 320)
          .padding()
      }
  }
  */
}