Initial ios library

ios/ios.swift

@@ -0,0 +1,9 @@
+import Foundation
+
+@objc(YourLibrary)
+class YourLibrary: NSObject {
+  @objc
+  func sampleMethod(_ input: String, resolve: @escaping RCTPromiseResolveBlock, reject: @escaping RCTPromiseRejectBlock) {
+    resolve("iOS: " + input)
+  }
+}

ios/library.m

@@ -0,0 +1,14 @@
+#import <React/RCTBridgeModule.h>
+
+@interface YourLibrary : NSObject <RCTBridgeModule>
+@end
+
+@implementation YourLibrary
+
+RCT_EXPORT_MODULE();
+
+RCT_EXPORT_METHOD(sampleMethod:(NSString *)input resolver:(RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject) {
+  resolve([@"iOS: " stringByAppendingString:input]);
+}
+
+@end

src/index.ts

@@ -1,5 +1,6 @@
 import bitcoin from 'bitcoinjs-lib';
 import axios from 'axios';
+import { NativeModules, Platform } from 'react-native';
 
 // Define types for UTXO and PayJoin response
 interface Utxo {
@@ -79,5 +80,16 @@ function fetchUtxos(senderAddress: string): Utxo[] | PromiseLike<Utxo[]> {
   throw new Error('Function not implemented.');
 }
 
+
+const { YourLibrary } = NativeModules;
+
+const sampleMethod = async (input: string): Promise<string> => {
+  return await YourLibrary.sampleMethod(input);
+};
+
+export default {
+  sampleMethod,
+};
+
 export { createInitialPayJoinTx, sendPayJoinRequest, finalizeAndBroadcast, broadcastTransaction };