almost · November 17, 2022 14:05 · Apr 13, 2015 · Apr 13, 2015 · Apr 13, 2015
diff --git a/react-native-simulator-and-device.md → 1-react-native-simulator-and-device.md b/react-native-simulator-and-device.md → 1-react-native-simulator-and-device.md
diff --git a/AppDelegate.m b/AppDelegate.m
@@ -0,0 +1,53 @@
+// My complete AppDelegate.m file
+
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+#import "AppDelegate.h"
+
+#import "RCTRootView.h"
+
+@implementation AppDelegate
+
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
+{
+  NSURL *jsCodeLocation;
+
+  // Loading JavaScript code
+  #if DEBUG
+    // For Debug build load from development server. Start the server from the repository root:
+    //
+    // $ npm start
+    #if TARGET_IPHONE_SIMULATOR
+        // Run from locally running dev server
+        jsCodeLocation = [NSURL URLWithString:@"http://localhost:8081/index.ios.bundle"];
+    #else
+        // Run on device with code coming from dev server on PC (change the IP to your PCs IP)
+        jsCodeLocation = [NSURL URLWithString:@"http://192.168.11.57:8081/index.ios.bundle"];
+    #endif
+  #else
+    // For production load from pre-bundled file on disk. To re-generate the static bundle, run
+    //
+    // $ curl http://localhost:8081/index.ios.bundle -o main.jsbundle
+    jsCodeLocation = [[NSBundle mainBundle] URLForResource:@"main" withExtension:@"jsbundle"];
+  #endif
+
+  RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation
+                                                      moduleName:@"activeinbox"
+                                                   launchOptions:launchOptions];
+
+  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
+  UIViewController *rootViewController = [[UIViewController alloc] init];
+  rootViewController.view = rootView;
+  self.window.rootViewController = rootViewController;
+  [self.window makeKeyAndVisible];
+  return YES;
+}
+
+@end
diff --git a/react-native-simulator-and-device.md b/react-native-simulator-and-device.md
@@ -2,7 +2,7 @@ In the default React Native app scaffolding you have to edit `AppDelegate.m` to
 
 NOTE: You need to edit YOUR-IP-HERE and change it to the IP to load the code from when in Debug mode on a device. You could use a service like [ngrok](https://ngrok.com) to make this work from anywhere.
 
-```objectivec
+```objective-c
   NSURL *jsCodeLocation;
 
   // Loading JavaScript code

diff --git a/react-native-simulator-and-device.md b/react-native-simulator-and-device.md
@@ -0,0 +1,26 @@
+In the default React Native app scaffolding you have to edit `AppDelegate.m` to change where it loads the code if you want to test on your device. I use the following snippet to detect if it's being compiled for Debug or Production and for the Simulator or a device. For Production it uses a copy of the code included in the bundle, for Debug on the simualtor it loads from a server on localhost and for Debug on a device it loads from a server on a given IP address.
+
+NOTE: You need to edit YOUR-IP-HERE and change it to the IP to load the code from when in Debug mode on a device. You could use a service like [ngrok](https://ngrok.com) to make this work from anywhere.
+
+```objectivec
+  NSURL *jsCodeLocation;
+
+  // Loading JavaScript code
+  #if DEBUG
+    // For Debug build load from development server. Start the server from the repository root:
+    //
+    // $ npm start
+    #if TARGET_IPHONE_SIMULATOR
+        // Run from locally running dev server
+        jsCodeLocation = [NSURL URLWithString:@"http://localhost:8081/index.ios.bundle"];
+    #else
+        // Run on device with code coming from dev server on PC (change the IP to your PCs IP)
+        jsCodeLocation = [NSURL URLWithString:@"http://YOUR-IP-HERE:8081/index.ios.bundle"];
+    #endif
+  #else
+    // For production load from pre-bundled file on disk. To re-generate the static bundle, run
+    //
+    // $ curl http://localhost:8081/index.ios.bundle -o main.jsbundle
+    jsCodeLocation = [[NSBundle mainBundle] URLForResource:@"main" withExtension:@"jsbundle"];
+  #endif
+  ```
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