How to Set Orientation in React Native App Without using any package

Controlling Orientation on Android

For Android, you can control the orientation of your React Native app by modifying the AndroidManifest.xml file located in the android/app/src/main directory of your project. Follow these steps:

1. Open the AndroidManifest.xml file.

2. Locate the <activity> tag for your main activity, which is typically named .MainActivity.

3. To set your app to landscape mode, add the following attribute to the <activity> tag:

   xml
   android:screenOrientation="landscape"
   

   Your <activity> tag should now look something like this:

   xml
   <activity
     android:name=".MainActivity"
     android:label="@string/app_name"
     android:configChanges="keyboard|keyboardHidden|orientation|screenSize|uiMode"
     android:screenOrientation="landscape"
     android:windowSoftInputMode="adjustResize">
   

4. To set your app to portrait mode, simply change the value of android:screenOrientation to "portrait".

Controlling Orientation on iOS

For iOS, you'll need to make some changes in the AppDelegate.m file located in the ios/[YourAppName] directory. Follow these steps:

1. Open the AppDelegate.m file.

2. To set your app to landscape mode, add the following line inside the application method:

   objective
   [[UIDevice currentDevice] setValue:@(UIInterfaceOrientationLandscapeLeft) forKey:@"orientation"];
   

3. To set your app to portrait mode, use:

   objective
   [[UIDevice currentDevice] setValue:@(UIInterfaceOrientationPortrait) forKey:@"orientation"];
   

4. To enforce the orientation, override the supportedInterfaceOrientationsForWindow method:

   objective
   - (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {  if ([[UIDevice currentDevice] orientation] == UIInterfaceOrientationPortrait) {
           return UIInterfaceOrientationMaskPortrait;
       } else {
           return UIInterfaceOrientationMaskLandscape;
       }
   }
   

By following these steps, you can control the orientation of your React Native app on both Android and iOS without the need for external packages. Make sure to test your app thoroughly in both portrait and landscape modes to ensure everything works as expected.