Скачать или смотреть How to Fix SliverGrid Not Displaying Inside CustomScrollView in Flutter

Discover how to effectively use `SliverGrid` with `CustomScrollView` in Flutter while fetching data from a REST API. Learn the tips to avoid common issues and ensure that your grid displays properly.
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This video is based on the question https://stackoverflow.com/q/69244582/ asked by the user 'Mahi' ( https://stackoverflow.com/u/14519278/ ) and on the answer https://stackoverflow.com/a/69244983/ provided by the user 'Md. Yeasin Sheikh' ( https://stackoverflow.com/u/10157127/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the Issue of SliverGrid Not Showing Inside CustomScrollView in Flutter

If you're developing a Flutter application and have encountered the frustrating issue of your SliverGrid not displaying inside a CustomScrollView, you’re not alone. This problem usually arises when trying to fetch data from a REST API and properly displaying it in a grid format. In this guide, we will identify the core issue and provide you with a step-by-step guide to resolve it.

Understanding the Problem

When attempting to retrieve data using FutureBuilder and display it within a SliverGrid, developers often face a white screen with no grid items visible. This typically happens for a couple of reasons:

The future does not return data correctly.

The childCount property of SliverChildBuilderDelegate is not set properly, which is essential for rendering the correct number of items in the grid.

Now, let’s break down the solution into manageable parts to ensure your SliverGrid functions correctly.

Step-by-Step Solution

1. Fetching Data with a Future

First, define your asynchronous function that simulates fetching data. In our case, we will create a simple function that returns a static list after a delay.

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2. Implementing FutureBuilder Inside CustomScrollView

You need to correctly implement FutureBuilder within the CustomScrollView. This is crucial because FutureBuilder handles the asynchronous nature of your data fetching. Use the following code to integrate FutureBuilder properly:

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3. Full Widget Example

Here is how the complete widget would look when you incorporate the steps mentioned above:

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Conclusion

By following these steps, you should be able to resolve the issue of SliverGrid not displaying inside a CustomScrollView. Ensure that your FutureBuilder is used correctly and that you provide the right childCount in SliverChildBuilderDelegate. This will guarantee that your grid populates with data from your API, rather than remaining blank.

Did this solve your question? Share your thoughts or any challenges you faced while implementing this solution in the comments below!