Example of calling swift code from RN

ios/Native/Application/RNPlayground-Bridging-Header.h

@@ -1,2 +1,3 @@
 
 #import <React/RCTViewManager.h>
+#import <React/RCTBridgeModule.h>

ios/Native/Application/Services/TestingService.swift

@@ -0,0 +1,31 @@
+//
+//  TestingService.swift
+//  RNPlayground
+//
+//  Created by Artur Gurgul on 03/08/2025.
+//
+
+import Foundation
+import React
+
+@objc(TestingServiceModule)
+class TestingServiceModule: NSObject {
+
+  @objc
+  func greet(_ name: String,
+             resolver resolve: @escaping RCTPromiseResolveBlock,
+             rejecter reject: @escaping RCTPromiseRejectBlock) {
+    let message = "Hello, \(name)! From Swift."
+    resolve(message)
+  }
+
+  @objc
+  func constantsToExport() -> [AnyHashable: Any]! {
+    return ["greeting": "Hello from Swift"]
+  }
+
+  @objc
+  static func requiresMainQueueSetup() -> Bool {
+    return false
+  }
+}

ios/Native/Application/Services/TestingServiceModuleBridge.m

@@ -0,0 +1,17 @@
+//
+//  TestingServiceModuleBridge.m
+//  RNPlayground
+//
+//  Created by Artur Gurgul on 03/08/2025.
+//
+
+#import <React/RCTBridgeModule.h>
+
+// This tells React Native about the Swift class
+@interface RCT_EXTERN_MODULE(TestingServiceModule, NSObject)
+
+RCT_EXTERN_METHOD(greet:(NSString *)name
+                  resolver:(RCTPromiseResolveBlock)resolve
+                  rejecter:(RCTPromiseRejectBlock)reject)
+
+@end

ios/Native/Application/Shared/SharedState.swift

@@ -16,7 +16,7 @@ final class SharedState: ObservableObject {
   private let emitter = EventEmitter.sharedInstance
   
   // SwiftUI => RN => SwiftUI
-  @Published var text1: String = ""
+  @Published var message: String = ""
   
   func send(message: String) {
     emitter.send(message: message)

ios/Native/Application/Views/BaseButton/BaseButton.swift

@@ -12,7 +12,7 @@ struct BaseButton: View {
   
   var body: some View {
     Button("SwiftUI Button") {
-      sharedState.text1 = "Clicked in SwiftUI button that was created in RN"
+      sharedState.message = "Clicked in SwiftUI button that was created in RN"
     }
   }
 }

ios/Native/Application/Views/CustomButton/CustomButtonManager.m

@@ -1,3 +1,10 @@
+//
+//  CustomButtonManager.m
+//  RNPlayground
+//
+//  Created by Artur Gurgul on 02/08/2025.
+//
+
 #import <React/RCTViewManager.h>
 
 @interface RCT_EXTERN_MODULE(CustomButtonManager, RCTViewManager)

ios/Native/Application/Views/ToolboxHeader.swift

@@ -18,7 +18,7 @@ struct ToolboxHeader: View {
           sharedState.send(message: "hello from Swift!")
         }
       }
-      Text("SwiftUI => RN => SwiftUI: \(sharedState.text1)")
+      Text("Message: \(sharedState.message)")
     }
   }
 }