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Learn how to create a dynamic Flutter bottom sheet that updates its content based on user interaction using `StatefulBuilder`.
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How to Dynamically Show Different Widgets in a Bottom Sheet on Button Press in Flutter

In Flutter, creating dynamic interfaces can sometimes be challenging, particularly when working with modals or bottom sheets. One common issue developers encounter is needing to show different content in a bottom sheet based on user interactions, such as button presses. If you've found yourself in this situation, you're not alone. Let's explore how to solve this problem effectively!

The Problem

You want to display a showModalBottomSheet() in your Flutter application that can show different widgets when a button inside it is pressed. Using a simple boolean variable to manage what gets displayed doesn't seem to work as expected because the bottom sheet does not rebuild when you call setState(). Instead, we can use a StatefulBuilder to tap into the state management capabilities of Flutter.

The Solution

To dynamically change the widgets in your modal bottom sheet, you need to use the StatefulBuilder. This widget provides a way to update the state without needing to close and reopen the bottom sheet. Here’s how to implement this solution in a few simple steps.

Step 1: Using showModalBottomSheet

Begin by calling the showModalBottomSheet function. Ensure you set the context parameter correctly.

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Step 2: Use StatefulBuilder

Wrap your widget tree inside the StatefulBuilder. This allows you to receive a setModalState function that can be called to update the state in the bottom sheet.

Step 3: Toggle Widgets

You can now manage which widget to show based on user interactions. Below is an example structure:

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Example Widget Building Functions

You can create separate functions for each widget to keep your code organized:

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Conclusion

By using the StatefulBuilder, you've effectively solved the problem of rendering different widgets in a modal bottom sheet on button presses. This method not only enhances user interaction but also keeps your code clean and maintainable. Now you have the structure needed to dynamically switch between any set of widgets within your bottom sheet!

Feel free to expand upon this structure for more complex use cases, and enjoy the enhanced user experience in your Flutter applications!