Скачать или смотреть Resolving Getx onInit Not Being Called: A Complete Guide to Splash Screen Issues in Flutter

Discover why your Flutter app gets stuck on the splash screen with `Getx` state management and learn how to resolve `onInit` not being called in your controller.
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This video is based on the question https://stackoverflow.com/q/69805779/ asked by the user 'Hoo' ( https://stackoverflow.com/u/5261462/ ) and on the answer https://stackoverflow.com/a/69858064/ provided by the user 'S. M. JAHANGIR' ( https://stackoverflow.com/u/10856808/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting Getx Issues: Why Your App is Stuck on the Splash Screen

If you're developing a Flutter application and are using Getx for state management, you might run into a situation where your app gets stuck on the splash screen. This problem can often stem from the onInit method in your controller not being called. In this guide, we will explore the reasons behind the issue and provide a structured solution to get your app back on track.

The Problem

You have implemented a splash screen in your Flutter app using Getx, and the expectation is that if the authToken is not empty, the app should seamlessly transition to the main page. However, you've encountered a blockage where the onInit method in your controller class isn't firing, leaving your app frozen on the splash screen.

Example Code

Let’s take a look at the structure of your code:

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In this snippet, you would expect to see "call onInit" printed to the console when the controller initializes. However, since it doesn't, your app is stuck.

The Solution

To resolve this problem, there are a few adjustments you can make to your code. Here’s a breakdown of the steps:

Step 1: Initialize Your Bindings

To ensure that your bindings are initialized before they are used, you need to explicitly define the initialBinding in your GetMaterialApp. This will allow the MainPageController to be ready when the application starts.

Here’s how to do that:

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Step 2: Understand Controller Lifecycle

Keep in mind that the controller's lifecycle methods, including onInit, will only be called when the controller is actually used in the view. If the controller is not connected to any widget, the lifecycle methods will not trigger. Hence, you need to ensure that the controller is utilized within your splash screen or another page.

Step 3: Implement Middleware

Using middleware can help manage navigation based on the user's authentication state. Here's an example of how to set up a middleware class:

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Handling Errors

If you encounter errors regarding the controller not being found (for example, “LoginPageController not found”), it indicates that you need to register the controller properly using Get.put or Get.lazyPut.

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Conclusion

By implementing the above steps, you should be able to resolve the issues causing your Flutter app to be stuck on the splash screen while using Getx for state management. Initializing the bindings correctly and understanding the lifecycle of controllers will ensure that your onInit method is called as expected.

If you face additional challenges while coding in Flutter or using Getx, don't hesitate to seek advice from the community or revisit the documentation for deeper insights.



In Summary:

Initialize your bindings in GetMaterialApp.

Ensure controllers are used in the UI.

Implement middleware for navigation based on user authentication.

Correctly register controllers to avoid not found errors.

With these techniques, your Flutter application should transition smoothly from the splash screen to the main page!