Скачать или смотреть How to Dynamically Call Widgets in Flutter Using Variables: S1, S2, S3...

Discover how to effectively use Dart's StreamBuilder in Flutter to dynamically invoke widgets instead of hardcoding their calls with variable names like `S1`, `S2`, `S3`.
---
This video is based on the question https://stackoverflow.com/q/62398320/ asked by the user 'Andres Martinez' ( https://stackoverflow.com/u/12528009/ ) and on the answer https://stackoverflow.com/a/62398420/ provided by the user 'Keezy Silencer' ( https://stackoverflow.com/u/8577375/ ) 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: Widget name as variable 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.
---
Dynamically Invoking Widgets in Flutter: A Common Dilemma

Flutter is a powerful toolkit for building beautiful natively compiled applications. As developers, we often run into situations where we need to call multiple widgets programmatically. A common requirement might be to dynamically generate widgets with names like S1, S2, S3, and so on. However, how do we achieve this without hardcoding each widget call?

The Limitation: Using Variable Names for Widgets

Imagine needing to invoke widgets based on a counter. A naive approach might look like this:

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

or you might end up with repetitive code like:

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

This can lead to code that is not only cumbersome but also difficult to maintain and scale. Unfortunately, Dart (the programming language behind Flutter) does not support directly invoking class constructors using a variable for the class name. So, what’s the solution here?

A Better Solution: Using StreamBuilder for Dynamic Views

Instead of trying to dynamically generate widget names, we can utilize StreamBuilder, which is a flexible way to build widgets based on data coming from a Stream. This approach allows you to create a dynamic UI that can easily respond to changes, making your app more responsive and easier to manage.

Steps to Use StreamBuilder in Flutter

Define Your Data Source: Start by defining the data or state that will determine which widgets to display. This may come from an API, user input, or another source.

Set Up a Stream: Create a Stream that emits your data. This will trigger the StreamBuilder to rebuild the UI whenever the data is updated.

Use StreamBuilder:

You’ll need to provide your Stream to the StreamBuilder and define how to build your widgets based on the emitted data.

Here’s a simple example:

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

Key Benefits of Using StreamBuilder

Dynamic Updates: Automatically rebuilds the UI when new data arrives.

Ease of Maintenance: Reduces the need for repetitive code.

Responsive Design: Easier to manage the state of your application.

Conclusion

While directly invoking widgets using variable names like S1, S2, and S3 isn't possible in Dart, leveraging the StreamBuilder provides a robust solution that allows for dynamic and responsive widget generation. Not only does this clean up your code, but it also enhances the user experience by tightly integrating with data changes. Embrace the power of Streams and make your Flutter application more dynamic and efficient!