Скачать или смотреть Fixing the Scaffold.geometryOf() Error: A Simple Guide for Flutter Developers

Discover how to resolve the `Scaffold.geometryOf()` must only be accessed during the paint phase error in Flutter with clear step-by-step instructions.
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Solving the Scaffold.geometryOf() Error in Flutter

If you’re developing a Flutter application and have encountered the error “Scaffold.geometryOf() must only be accessed during the paint phase,” you're not alone. This error often pops up when dealing with the layout of widgets, particularly when using a Floating Action Button (FAB) within a Bottom App Bar. Below, we’ll break down the cause of this error and provide a straightforward solution to get your app back on track.

Understanding the Error

When the error occurs, you’ll see messages in the debug console similar to:

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

This indicates an issue with accessing the ScaffoldGeometry when it is not available, commonly when it is being accessed during the wrong phase of the widget lifecycle. In this instance, it arises after you press the Floating Action Button.

Symptoms

Clicking on any widget on the screen becomes unresponsive after the FAB is pressed.

Additional errors related to mouse_tracker may appear, indicating further issues in the widget tree.

How to Solve It

To fix this error, you can modify the location of your Floating Action Button. Here’s a step-by-step guide on how to do that:

Step 1: Locate Your Scaffold Widget

Open your Flutter file and locate the Scaffold widget where you have defined your Floating Action Button. It usually appears similar to this:

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

Step 2: Change the Floating Action Button Location

Notice the line that specifies the location of the Floating Action Button. Change the floatingActionButtonLocation from FloatingActionButtonLocation.endContained to FloatingActionButtonLocation.endFloat. Here is how the updated code should look:

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

Step 3: Test your Application

After making this change, run your application again. The FAB should now function correctly without throwing the geometry error, allowing your app to be interactive as intended.

Conclusion

Dealing with widget hierarchy issues can be tricky in Flutter, especially when specific functionalities fail during certain phases of the widget lifecycle. By setting the Floating Action Button to a floating location rather than a contained one, you can resolve the Scaffold.geometryOf() error effectively.

With just a simple adjustment, you can ensure your Flutter app remains responsive and user-friendly. Happy coding!