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Discover how to manage state efficiently in Flutter by utilizing `Inherited Widgets`. Learn how to set and rebuild data across widgets seamlessly!
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How to Set Data in an Inherited Widget from Another Widget in Flutter

When developing with Flutter, one of the common challenges you might encounter is how to manage and share state across your widget tree. Specifically, working with Inherited Widgets can be a bit tricky, especially when you want to set data that is initially immutable. In this post, we'll dive into how to effectively configure your Inherited Widget to transmit data, using a practical example involving an OTP authentication phone number.

Understanding Inherited Widgets

An Inherited Widget is a special kind of widget that allows you to pass data down through the widget tree without explicitly needing to pass the data through the constructor of each widget. However, a significant limitation is that Inherited Widgets are immutable, meaning once they are created, their data cannot be changed.

To handle this, we can leverage StatefulWidget to manage the state and force the Inherited Widget to rebuild whenever the state changes.

The Problem

Suppose you want to set a phone number for OTP authentication and display that number on another screen. You might wonder:

How do you set this initial data?

How can you read and update it later using the Inherited Widget?

The Solution

The solution lies in rebuilding your Inherited Widget whenever the data changes. Here's how to achieve that step by step:

Step 1: Create Your Inherited Widget

Define your Inherited Widget, which will carry the data you want to share. In this case, we'll create an Inherited Widget that holds a simple counter.

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Step 2: Use a Stateful Widget

Create a StatefulWidget that will maintain the state you wish to share through your Inherited Widget. The state (in this example, a counter) will be updated through user interaction.

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Step 3: Create a Child Widget to Display Data

Next, create a separate widget that reads from the Inherited Widget and displays the data.

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Step 4: Putting It All Together

Now that you have set up the Inherited Widget, the StatefulWidget, and the child widget to display data, you’re ready to run your application. When you press the floating action button, the counter will increment, and the Inherited Widget will rebuild, updating the CounterWidget with the new value.

Conclusion

By utilizing an Inherited Widget in conjunction with Stateful Widget, you can efficiently manage and share state across your Flutter application. This technique is not only useful for displaying simple data like a counter but can also be adapted for more complex states such as user authentication details.

Understanding how to rebuild the Inherited Widget when necessary is fundamental for maintaining state effectively in Flutter applications. If you find concepts like Provider to be a bit advanced, this method offers a straightforward path for managing state with Inherited Widgets.

Feel free to implement this example and tweak it to suit your specific requirements!