If your Ionic 2 application shows a white screen on iOS after remote build, there are several potential causes for this issue. Let's explore some common reasons and their possible solutions:

  1. Missing Cordova Plugins: Ensure that all the required Cordova plugins are installed and properly configured in your Ionic 2 project. Some plugins are essential for proper functioning, and their absence might cause issues, including a white screen.

    To check the installed plugins, run the following command in your project directory:

    ionic cordova plugin ls

    Make sure all the required plugins are listed and have been installed successfully. Additionally, verify that you have followed the plugin's installation instructions correctly.

  2. CSP (Content Security Policy) Restrictions: Content Security Policy (CSP) is a security feature that prevents potentially unsafe content from being loaded. A misconfigured CSP might block critical resources from loading, resulting in a white screen.

    Check the CSP settings in your index.html file, typically located in the src directory. Ensure that it allows resources like scripts and styles to load from the appropriate sources. For example, to allow all resources, you can use the following:

    <meta http-equiv="Content-Security-Policy" content="default-src *; style-src * 'unsafe-inline'; script-src * 'unsafe-inline' 'unsafe-eval'">

    Note that using * allows resources from any source, which might not be the most secure option. Adjust the CSP settings based on your application's requirements and trusted sources.

  3. Error Handling and Logging: Implement proper error handling and logging in your application. Sometimes, errors may occur during remote builds that don't appear during local development. Logging errors to the console or using a remote logging service (e.g., Sentry) can provide insights into the root cause of the white screen issue.

  4. Splash Screen and Loading Delay: In some cases, the white screen issue may be related to slow loading resources or delays during the app startup. Make sure you have a proper splash screen set up to show users that the app is loading. Additionally, consider introducing a loading spinner to indicate progress.

  5. iOS Compatibility: Check if your Ionic 2 project is compatible with the version of iOS you are targeting. Issues with iOS version compatibility might cause the white screen problem.

  6. Remote Build Environment: Verify that the remote build environment is properly set up and running. The remote build process may have its configurations and requirements that differ from your local development environment.

  7. iOS Permissions: If your app requires specific permissions (e.g., location, camera), ensure that the necessary permissions are correctly configured in your app's config.xml and requested at runtime.

  8. Cross-Origin Resource Sharing (CORS): If your app loads data from external servers, make sure that CORS is correctly set up on the servers to allow cross-origin requests from your app.

By systematically checking and troubleshooting these potential issues, you can resolve the white screen problem in your Ionic 2 application and ensure a smooth running app on iOS after remote build.

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