Example of calling swift code from RN

ios/Native/Application/Services/TestingService.swift

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+//
+//  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

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+//
+//  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