refactor: migrate AppDelegate to Swift and remove Objective-C files

Author: lposen

example/ios/AppDelegate.swift

@@ -0,0 +1,56 @@
+//
+//  AppDelegate.swift
+//  ReactNativeSdkExample
+//
+//  Created by Loren Posen on 6/11/25.
+//
+
+import UIKit
+import React
+import React_RCTAppDelegate
+import ReactAppDependencyProvider
+
+@main
+class AppDelegate: UIResponder, UIApplicationDelegate {
+  var window: UIWindow?
+
+  var reactNativeDelegate: ReactNativeDelegate?
+  var reactNativeFactory: RCTReactNativeFactory?
+
+  func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil
+  ) -> Bool {
+    let delegate = ReactNativeDelegate()
+    let factory = RCTReactNativeFactory(delegate: delegate)
+    delegate.dependencyProvider = RCTAppDependencyProvider()
+
+    reactNativeDelegate = delegate
+    reactNativeFactory = factory
+
+    window = UIWindow(frame: UIScreen.main.bounds)
+
+    factory.startReactNative(
+      withModuleName: "ReactNativeSdkExample",
+      in: window,
+      launchOptions: launchOptions
+    )
+
+    return true
+  }
+}
+
+class ReactNativeDelegate: RCTDefaultReactNativeFactoryDelegate {
+  override func sourceURL(for bridge: RCTBridge) -> URL? {
+    self.bundleURL()
+  }
+
+  override func bundleURL() -> URL? {
+#if DEBUG
+    RCTBundleURLProvider.sharedSettings().jsBundleURL(forBundleRoot: "index")
+#else
+    Bundle.main.url(forResource: "main", withExtension: "jsbundle")
+#endif
+  }
+}
+