add example for capturing initial notification in push notification m…

…anager (facebook#42687)

Summary:

Changelog: [Internal]

adding an example for if you want to use `getInitialNotification`.

Reviewed By: ingridwang

Differential Revision: D52931618

packages/react-native/Libraries/AppDelegate/RCTAppDelegate.mm

@@ -198,6 +198,7 @@ - (BOOL)runtimeSchedulerEnabled
 }
 
 #pragma mark - UISceneDelegate
+
 - (void)windowScene:(UIWindowScene *)windowScene
     didUpdateCoordinateSpace:(id<UICoordinateSpace>)previousCoordinateSpace
         interfaceOrientation:(UIInterfaceOrientation)previousInterfaceOrientation
@@ -207,6 +208,7 @@ - (void)windowScene:(UIWindowScene *)windowScene
 }
 
 #pragma mark - RCTCxxBridgeDelegate
+
 - (std::unique_ptr<facebook::react::JSExecutorFactory>)jsExecutorFactoryForBridge:(RCTBridge *)bridge
 {
   _runtimeScheduler = std::make_shared<facebook::react::RuntimeScheduler>(RCTRuntimeExecutorFromBridge(bridge));

packages/rn-tester/RNTester/AppDelegate.mm

@@ -9,6 +9,7 @@
 
 #import <UserNotifications/UserNotifications.h>
 
+#import <React/RCTBridge.h>
 #import <React/RCTBundleURLProvider.h>
 #import <React/RCTDefines.h>
 #import <React/RCTLinkingManager.h>
@@ -116,12 +117,22 @@ - (void)userNotificationCenter:(UNUserNotificationCenter *)center
 
 // Required for the remoteNotificationReceived and localNotificationReceived events
 // Called when a notification is tapped from background. (Foreground notification will not be shown per
-// the presentation option selected above.)
+// the presentation option selected above).
 - (void)userNotificationCenter:(UNUserNotificationCenter *)center
     didReceiveNotificationResponse:(UNNotificationResponse *)response
              withCompletionHandler:(void (^)(void))completionHandler
 {
-  [RCTPushNotificationManager didReceiveNotification:response.notification];
+  UNNotification *notification = response.notification;
+
+  // This condition will be true if tapping the notification launched the app.
+  if ([response.actionIdentifier isEqualToString:UNNotificationDefaultActionIdentifier]) {
+    RCTPushNotificationManager *pushNotificationManager = [self.bridge moduleForName:@"PushNotificationManager"
+                                                               lazilyLoadIfNecessary:YES];
+    // This can be retrieved with getInitialNotification.
+    pushNotificationManager.initialNotification = notification;
+  }
+
+  [RCTPushNotificationManager didReceiveNotification:notification];
   completionHandler();
 }