Скачать или смотреть Solving the FutureBuilder Rebuild Loop Issue in Flutter

Discover how to prevent continuous page rebuilds in your Flutter app using `FutureBuilder` with effective strategies and code examples.
---
This video is based on the question https://stackoverflow.com/q/65589655/ asked by the user 'Daniel Park' ( https://stackoverflow.com/u/14148093/ ) and on the answer https://stackoverflow.com/a/65589815/ provided by the user 'Randal Schwartz' ( https://stackoverflow.com/u/22483/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: I have a problem about using FutureBuilder in Flutter

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Solving the FutureBuilder Rebuild Loop Issue in Flutter

When developing apps in Flutter, you might run into a common issue when using FutureBuilder: the page continuously rebuilds. This behavior can be frustrating, especially when it hinders performance and user experience. In this guide, we’ll discuss the root cause of this problem and provide a clear solution to help you manage FutureBuilder effectively.

Understanding the Problem

The FutureBuilder widget in Flutter is designed to build itself based on the latest snapshot of interaction with a Future. However, if you pass the Future to the FutureBuilder each time the widget rebuilds, it will create a new instance of that Future. Consequently, this causes the FutureBuilder to rebuild unnecessarily, leading to degraded performance and a poor user experience.

In simpler terms: Each time the FutureBuilder is called, it’s invoking a new Future, which triggers the rebuild process from the start again.

The Solution

To solve the issue of continuous rebuilding when using a FutureBuilder, you need to ensure that you compute the Future just once. You'll achieve this by moving the computation of the Future into the initState() method of your widget, instead of calculating it in the build method.

Step-by-Step Implementation

Use the initState Method: Override the initState() method in your Stateful Widget to compute the Future only once. This keeps the Future instance consistent across builds.

[[See Video to Reveal this Text or Code Snippet]]

Define the Future Variable: You need to create a variable to hold the Future instance so that it can be reused across rebuilds.

[[See Video to Reveal this Text or Code Snippet]]

Update Your FutureBuilder: Now, instead of calling initLikes() directly in the FutureBuilder, reference the futureVariable you defined.

[[See Video to Reveal this Text or Code Snippet]]

Summary

By using the initState() method to calculate the Future instance one time, you prevent the FutureBuilder from being triggered to rebuild repeatedly. This optimization leads to smoother performance and a better user experience within your Flutter app.

Final Thoughts

Understanding how FutureBuilder manages asynchronous data and rendering is key to building efficient Flutter applications. By following the steps outlined above, you can eliminate unnecessary rebuilds and ensure that your app runs smoothly.

If you have any questions or need further clarification on implementing this solution, feel free to leave a comment below!