Executing Functions After Build in Flutter Using GetX

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Introduction

Flutter is an exciting framework for building mobile applications, but there’s a common challenge developers face: executing functions after the widget tree has been built. Thankfully, GetX, a powerful state management library for Flutter, provides an elegant solution to this problem. In this beginner-friendly tutorial, we will explore how to execute functions after the build process using GetX, including the use of the onReady() method.

Prerequisites

Before we dive into the tutorial, make sure you have the following:

  • Basic knowledge of Flutter.
  • Flutter SDK installed on your computer.
  • A code editor (such as Visual Studio Code or Android Studio) set up for Flutter development.

Learning Objectives

By the end of this tutorial, you will be able to:

  • Create and initialize a GetX controller.
  • Write a function to be executed after the build process.
  • Use GetX to execute the function after the build, including utilizing the onReady() method.
  • Build a widget tree within the GetX framework.

Tutorial Steps

Setting Up onReady() Method In GetX Controller

Now, we need to create a GetX controller. This controller will help us manage our data and execute functions after the build process. Create a new Dart file for your controller, and let’s call it my_controller.dart:

import 'package:get/get.dart';

class MyController extends GetxController {
  @override
  void onInit() {
    super.onInit();
    // Initialize your data or perform setup tasks here
  }
  
  void executeAfterBuild() {
    // Your function code goes here
  }
  
  @override
  void onReady() {
    // Called 1 frame after onInit(). It is the perfect place to enter navigation events,
    // like snackbar, dialogs, or a new route, or async request.
    executeAfterBuild(); // Execute your function after the build process here
    super.onReady();
  }
}
OnReady() Method

The onReady() method is called one frame after onInit() and is the ideal place to handle navigation events, such as displaying snackbar messages, dialogs, navigating to a new route, or making asynchronous requests. It provides a convenient way to perform post-build actions in your Flutter app using GetX.

Executing Function After Build

We’re now ready to execute our function after the build process. To do this, open the Dart file where you want to use GetX (for example, your main application file) and follow these steps:

Below is the main code of our application in which we have initialized the above controller where we override the onReady() method, which will be executed automatically after the build process is complete.

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'my_controller.dart'; // Import your controller

void main() {
  runApp(GetMaterialApp(
    home: MyPage(),
    initialBinding: BindingsBuilder(() {
      Get.put(MyController()); // Initialize your controller
    }),
  ));
}

class MyPage extends GetView<MyController> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('GetX Example'),
      ),
      body: YourWidget();
      
    );
  }
}

Conclusion

Congratulations! You’ve learned how to execute functions after the build process in Flutter using GetX, including the important onReady() method. This knowledge will help you perform various tasks like making network requests, initializing data, and much more. Experiment with GetX in your Flutter projects to enhance your app’s functionality and improve your development workflow.

Additional Resources

Now you’re equipped to handle post-build actions in your Flutter apps using GetX. Happy coding!

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