Add dependency injection

ios/Native/Application/Shared/Emitter/Emitter.swift

@@ -9,14 +9,16 @@ import Combine
 import React
 
 @objc(Emitter)
-class Emitter: RCTEventEmitter {
+class Emitter: RCTEventEmitter, MessageEmitter {
+  @Injected private var eventEmitter: EventEmitter
+  
   override static func requiresMainQueueSetup() -> Bool {
     return true
   }
   
   override init() {
     super.init()
-    EventEmitter.sharedInstance.register(eventEmitter: self)
+    eventEmitter.register(eventEmitter: self)
   }
   
   override func supportedEvents() -> [String]! {

ios/Native/Application/Shared/Emitter/EventEmitter.swift

@@ -7,22 +7,34 @@
 
 import Foundation
 
-class EventEmitter {
-  static let sharedInstance = EventEmitter()
+protocol MessageEmitter {
+  func send(message: String)
+}
 
-  private var eventEmitter: Emitter?
+class NullMessageEmitter: MessageEmitter {
+  func send(message: String) {
+    print("Warning: Emiter is not ready yet")
+  }
+}
 
-  private init() {}
+
+protocol EventEmitter {
+  func send(message: String)
+  func register(eventEmitter: Emitter)
+}
+
+class DefaultEventEmitter: EventEmitter {
+  private var eventEmitter: MessageEmitter = NullMessageEmitter()
 
   func register(eventEmitter: Emitter) {
     self.eventEmitter = eventEmitter
   }
 
   func send(message: String) {
-    eventEmitter?.send(message: message)
+    eventEmitter.send(message: message)
   }
 
   var isReady: Bool {
-    return eventEmitter != nil
+    return (eventEmitter is NullMessageEmitter) == false
   }
 }

ios/Native/Application/Shared/SharedState.swift

@@ -13,12 +13,12 @@ import ReactAppDependencyProvider
 
 final class SharedState: ObservableObject {
   var reactNativeFactory: RCTReactNativeFactory?
-  private let emitter = EventEmitter.sharedInstance
+  let container = DependencyContainer()
   
   // SwiftUI => RN => SwiftUI
   @Published var message: String = ""
   
-  func send(message: String) {
-    emitter.send(message: message)
+  init() {
+    container.register(EventEmitter.self) { _ in DefaultEventEmitter() }
   }
 }

ios/Native/Application/Views/CustomButton/CustomButton.swift

@@ -11,50 +11,51 @@ import SwiftUI
 
 @objc(CustomButton)
 class CustomButton: UIView {
+  @Injected private var emitter: EventEmitter
+  
+  private let label: UILabel = {
+    let lbl = UILabel()
+    lbl.text = "Hello from native"
+    lbl.textColor = .white
+    lbl.translatesAutoresizingMaskIntoConstraints = false
+    return lbl
+  }()
 
-    private let label: UILabel = {
-        let lbl = UILabel()
-        lbl.text = "Hello from native"
-        lbl.textColor = .white
-        lbl.translatesAutoresizingMaskIntoConstraints = false
-        return lbl
-    }()
+  private let button: UIButton = {
+    let btn = UIButton(type: .system)
+    btn.setTitle("Click Me", for: .normal)
+    btn.setTitleColor(.white, for: .normal)
+    btn.translatesAutoresizingMaskIntoConstraints = false
+    return btn
+  }()
 
-    private let button: UIButton = {
-        let btn = UIButton(type: .system)
-        btn.setTitle("Click Me", for: .normal)
-        btn.setTitleColor(.white, for: .normal)
-        btn.translatesAutoresizingMaskIntoConstraints = false
-        return btn
-    }()
+  override init(frame: CGRect) {
+    super.init(frame: frame)
+    self.backgroundColor = .systemBlue
 
-    override init(frame: CGRect) {
-        super.init(frame: frame)
-        self.backgroundColor = .systemBlue
+    self.addSubview(label)
+    self.addSubview(button)
 
-        self.addSubview(label)
-        self.addSubview(button)
+    setupConstraints()
+    button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
+  }
 
-        setupConstraints()
-        button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
-    }
+  required init?(coder: NSCoder) {
+    fatalError("init(coder:) has not been implemented")
+  }
 
-    required init?(coder: NSCoder) {
-        fatalError("init(coder:) has not been implemented")
-    }
+  private func setupConstraints() {
+    NSLayoutConstraint.activate([
+      label.leadingAnchor.constraint(equalTo: self.leadingAnchor, constant: 16),
+      label.centerYAnchor.constraint(equalTo: self.centerYAnchor),
 
-    private func setupConstraints() {
-        NSLayoutConstraint.activate([
-            label.leadingAnchor.constraint(equalTo: self.leadingAnchor, constant: 16),
-            label.centerYAnchor.constraint(equalTo: self.centerYAnchor),
+      button.leadingAnchor.constraint(equalTo: label.trailingAnchor, constant: 12),
+      button.centerYAnchor.constraint(equalTo: self.centerYAnchor),
+      button.trailingAnchor.constraint(lessThanOrEqualTo: self.trailingAnchor, constant: -16)
+    ])
+  }
 
-            button.leadingAnchor.constraint(equalTo: label.trailingAnchor, constant: 12),
-            button.centerYAnchor.constraint(equalTo: self.centerYAnchor),
-            button.trailingAnchor.constraint(lessThanOrEqualTo: self.trailingAnchor, constant: -16)
-        ])
-    }
-
-    @objc private func buttonTapped() {
-        
-    }
+  @objc private func buttonTapped() {
+    emitter.send(message: "Clicked in UIButton button that was created in RN")
+  }
 }

ios/Native/Application/Views/ToolboxHeader.swift

@@ -9,13 +9,14 @@ import SwiftUI
 
 struct ToolboxHeader: View {
   @EnvironmentObject var sharedState: SharedState
+  @Injected var emitter: EventEmitter
   
   var body: some View {
     VStack {
       HStack {
         Text("Actions")
         Button("Make it blue") {
-          sharedState.send(message: "hello from Swift!")
+          emitter.send(message: "hello from Swift!")
         }
       }
       Text("Message: \(sharedState.message)")

ios/Native/Utils/DI/DependencyContainer.swift

@@ -0,0 +1,47 @@
+//
+//  DependencyContainer.swift
+//  Vitaway
+//
+//  Created by Artur Gurgul on 20/06/2025.
+//
+
+final class DependencyContainer: Resolver {
+    private var factories: [String: (Resolver) -> Any] = [:]
+    private var instances: [String: Any] = [:]
+    
+    func register<T>(_ type: T.Type, cache: Bool = true, factory: @escaping (Resolver) -> T) {
+        let key = String(describing: type)
+        factories[key] = factory
+        
+        if cache {
+            instances[key] = factory(self)
+        }
+    }
+
+    func registerSingleton<T>(_ type: T.Type, factory: @escaping (Resolver) -> T) {
+        let key = String(describing: type)
+        factories[key] = factory
+    }
+    
+    func resolve<T>() -> T {
+        resolve(type: T.self)
+    }
+    
+    func resolve<T>(type: T.Type) -> T {
+        let key = String(describing: T.self)
+        
+        if let instance = instances[key] as? T {
+            return instance
+        }
+        
+        guard let factory = factories[key], let instance = factory(self) as? T else {
+            fatalError("No registered entry for type \(key)")
+        }
+        return instance
+    }
+  
+  static var shared: DependencyContainer {
+    (UIApplication.shared.delegate as! AppDelegate).sharedState.container
+  }
+}
+

ios/Native/Utils/DI/Injected.swift

@@ -0,0 +1,16 @@
+//
+//  Injected.swift
+//  Vitaway
+//
+//  Created by Artur Gurgul on 05/07/2025.
+//
+
+import UIKit
+
+@propertyWrapper
+class Injected<T> {
+    var wrappedValue: T {
+      DependencyContainer.shared.resolve(type: T.self)
+    }
+    
+}

ios/Native/Utils/DI/Resolver.swift

@@ -0,0 +1,10 @@
+//
+//  Resolver.swift
+//  Vitaway
+//
+//  Created by Artur Gurgul on 20/06/2025.
+//
+
+protocol Resolver {
+    func resolve<T>() -> T
+}

ios/RNPlayground/AppDelegate.swift

@@ -9,7 +9,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
   var window: UIWindow?
 
   var reactNativeDelegate: ReactNativeDelegate?
-  private let sharedState = SharedState()
+  let sharedState = SharedState()
 
   func application(
     _ application: UIApplication,