d

src/SrcFmt.swift

@@ -1,27 +0,0 @@
-import Foundation
-
-class SrcFmt: Formatter {
-    override func string(for obj: Any?) -> String? {
-        /**///print("ИГР SrcF.string obj: '\(obj)'")
-        guard let str = obj as? String else { return nil }
-        return String(str.dropFirst(2))
-    }
-
-    override func getObjectValue(
-        _ obj: AutoreleasingUnsafeMutablePointer<AnyObject?>?,
-        for string: String,
-        errorDescription error: AutoreleasingUnsafeMutablePointer<NSString?>?
-    ) -> Bool {
-        /**///print("ИГР SrcF.getOV string: '\(string)'")
-        let val: String
-        if string.hasPrefix("a:") || string.hasPrefix("u:") {
-            /**///print("ИГР SrcF.getOV-1")
-            val = string
-        } else {
-            /**///print("ИГР SrcF.getOV-2")
-            val = "u:\(string)"
-        }
-        obj?.pointee = val as AnyObject
-        return true
-    }
-}

src/TextFieldValueOwner.swift

@@ -0,0 +1,17 @@
+import Foundation
+
+class TextFieldValueOwner: Formatter {
+    override func string(for obj: Any?) -> String? {
+        guard let str = obj as? String else { return nil }
+        return String(str.dropFirst(2))
+    }
+
+    override func getObjectValue(
+        _ obj: AutoreleasingUnsafeMutablePointer<AnyObject?>?,
+        for string: String,
+        errorDescription error: AutoreleasingUnsafeMutablePointer<NSString?>?
+    ) -> Bool {
+        obj?.pointee = "u:\(string)" as AnyObject
+        return true
+    }
+}

src/V.swift

@@ -7,21 +7,13 @@ struct V: View {
     VStack {
       HStack {
         Text("Check text field:")
-        Text("'\(vm.t3)'")
+        Text("'\(vm.text)'")
           .fontWeight(.bold)
       }
-        /*
-      TextField("Placeholder", text: $vm.text)
+
+      TextField("Binding-3", value: $vm.text, formatter: TextFieldValueOwner())
         .padding(8)
-        .border(Color.red, width: 2)
-    
-      TextField("Binding-2", text: vm.bt2)
-        .padding(8)
-        .border(Color.blue, width: 2)
-        */
-        TextField("Binding-3", value: $vm.t3, formatter: SrcFmt())
-          .padding(8)
-          .border(Color.green, width: 4)
+        .border(Color.green, width: 4)
     }
     .frame(width: 320)
     .padding()

src/VM.swift

@@ -2,93 +2,25 @@ import Combine
 import SwiftUI
 
 final class VM: ObservableObject {
-  /*
-  @Published var text = ""
-  let changeText = PassthroughSubject<String, Never>()
-    
-  @Published var t2 = "a:value"
-  var bt2: Binding<String>!
-  */
-
-  @Published var t3 = "a:value"
+  @Published var text = "a:"
   
   var subscriptions = Set<AnyCancellable>()
 
   init() {
-      $t3
+      $text
+          // Исключаем конфликты от UI и App путём игнорирования спама.
           .debounce(for: .seconds(0.3), scheduler: DispatchQueue.main)
-          .sink { v in
-              /**/print("ИГР VM.init t3: '\(v)'")
-              // Ignore repoting application initiated strings
-              // Only report user initiated strings
-              guard v.hasPrefix("u:") else { return }
-              Bus.send(MeetupId.Keys.meetupIdTextUI.rawValue, String(v.dropFirst(2)))
-          }
+          // Нужны лишь значения от UI.
+          .filter { $0.hasPrefix("u:") }
+          // Убираем источник.
+          .map { String($0.dropFirst(2)) }
+          .sink { Bus.send(MeetupId.Keys.meetupIdTextUI.rawValue, $0) }
           .store(in: &subscriptions)
 
       Bus.receiveAsync(
         &subscriptions,
         [MeetupId.Keys.meetupIdTextApp.rawValue],
-        { [weak self] _, v in self?.applyFormattedValue(v) }
+        { [weak self] (_, v: String) in self?.text = "a:\(v)" }
       )
-
-
-/*
-      bt2 = Binding<String>(
-          get: { [weak self] in
-              String(self?.t2.dropFirst(2) ?? "")
-          },
-          set: { [weak self] v in
-              if v.hasPrefix("a:") {
-                  self?.t2 = v
-              } else {
-                  self?.t2 = "u:\(v)"
-              }
-          }
-      )
-      
-      $t2
-          .debounce(for: .seconds(0.3), scheduler: DispatchQueue.main)
-          .sink { v in
-              /**/print("ИГР VM.init t2: '\(v)'")
-              // Ignore repoting application initiated strings
-              // Only report user initiated strings
-              guard v.hasPrefix("u:") else { return }
-              Bus.Service.singleton?.send(MeetupId.Keys.meetupIdTextUI.rawValue, String(v.dropFirst(2)))
-          }
-          .store(in: &subscriptions)
-      
-      Bus.receive(
-        &subscriptions,
-        [MeetupId.Keys.meetupIdTextApp.rawValue],
-        { [weak self] k, v in self?.handleAppValue(k, v) }
-      )
-      
-    // Интерпретируем текст с задержкой, потому что:
-    // 1. смена @Published в ту же секунду игнорируется
-    //    полем ввода, т.е. нужна задержка
-    // 2. ожидаем окончания ввода (спама), чтобы
-    //    обработать введённое без потерь из-за конфликта
-    //    старых данных и новых.
-    $text
-      .debounce(for: .seconds(0.3), scheduler: DispatchQueue.main)
-      .sink { [weak self] v in
-          guard
-              let out = MeetupId.shouldFormat(v),
-              v != out
-          else {
-              return
-          }
-          /**/print("ИГР TFCVM.init changeT in/out: '\(v)'/'\(out)'")
-          self?.text = out
-      }
-      .store(in: &subscriptions)
- */
   }
-    
-  func applyFormattedValue(_ value: String) {
-      /**/print("ИГР VM.handleFV value: '\(value)'")
-      t3 = "a:\(value)"
-  }
-    
 }