The Named Parameter 'hidenavigationbarwhenkeyboardshows' Isn't Defined.

MIster jashon

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Oct 14, 2024

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"The named parameter 'hidenavigationbarwhenkeyboardshows' isn't defined" - A Common Flutter Error

This error message, "The named parameter 'hidenavigationbarwhenkeyboardshows' isn't defined", is a common problem encountered by Flutter developers. It signifies that you're attempting to use a parameter called hidenavigationbarwhenkeyboardshows in a method or widget, but this parameter doesn't exist in the intended context.

Let's break down the reasons why you might be encountering this error and explore solutions.

Understanding the Error

The hidenavigationbarwhenkeyboardshows parameter is not a standard Flutter parameter. It's not a built-in feature of Flutter's Scaffold or other widgets. This means you're likely trying to use a custom parameter or one defined within a third-party package.

Common Causes

1. Typographical Error: The most common cause is simply a typo. Double-check the spelling of the parameter name. Flutter is case-sensitive, so "hidenavigationbarwhenkeyboardshows" is different from "hidenavigationbarwhenkeyboardShows".
2. Outdated Package: You might be using an outdated version of a package that previously supported this parameter. Updating the package to its latest version can resolve this issue.
3. Custom Widget: If you are using a custom widget or a package that implements this parameter, you need to ensure the widget or package is properly configured and supports this parameter.

Solutions

1. Verify Spelling:

• Carefully examine the code where you're using the hidenavigationbarwhenkeyboardshows parameter. Check for any typos.
• Use the Ctrl + F (Windows) or Cmd + F (Mac) shortcut to search for the parameter within your project.

2. Update Packages:

• Open your pubspec.yaml file in your Flutter project.
• Check the versions of the packages you are using.
• To update packages, run the command flutter pub upgrade in your terminal.

3. Review Custom Widget Documentation:

• If you are using a custom widget, refer to its documentation to verify if it supports the hidenavigationbarwhenkeyboardshows parameter.
• Look for the package's README or API documentation.
• If the documentation doesn't mention the parameter, it's likely not supported.

4. Implement Keyboard Visibility Management:

• If you need to hide the navigation bar when the keyboard appears, you can implement your own solution using Flutter's keyboard visibility management tools:
  • FocusNode: Use FocusNode to detect when a text field gains or loses focus.
  • FocusScope.of(context).hasFocus: This property returns true if any widget in the FocusScope has focus.
  • MediaQuery.of(context).viewInsets.bottom: Use this to determine the height of the keyboard.

Example: Hiding the Navigation Bar on Keyboard Visibility

import 'package:flutter/material.dart';

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State {
  final FocusNode _focusNode = FocusNode();
  bool _showNavigationBar = true;

  @override
  void initState() {
    super.initState();
    _focusNode.addListener(() {
      setState(() {
        _showNavigationBar = !_focusNode.hasFocus;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: _showNavigationBar ? AppBar(
        title: const Text('My App'),
      ) : null,
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: TextField(
          focusNode: _focusNode,
          decoration: InputDecoration(
            hintText: 'Enter some text',
          ),
        ),
      ),
    );
  }
}

Conclusion

The "The named parameter 'hidenavigationbarwhenkeyboardshows' isn't defined" error usually stems from incorrect parameter usage, outdated packages, or custom widget implementations. By carefully reviewing the code, updating packages, and implementing your own keyboard visibility management if necessary, you can overcome this error and achieve the desired behavior in your Flutter application.