Скачать или смотреть How to Show a Bottom Navigation Bar on All Pages in Flutter

Learn how to implement a `Bottom Navigation Bar` in your Flutter app so that it is visible on every page. Enhance user experience by managing page transitions effectively while maintaining the navigation bar.
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This video is based on the question https://stackoverflow.com/q/61549089/ asked by the user 'mohammed nabil' ( https://stackoverflow.com/u/9380648/ ) and on the answer https://stackoverflow.com/a/70365601/ provided by the user 'Bensal' ( https://stackoverflow.com/u/12778764/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Show a Bottom Navigation Bar on All Pages in Flutter

If you're developing a Flutter app and want to enhance its navigation experience, you might wonder how to show a bottom navigation bar across all pages of your app. This can be particularly useful if your app contains multiple sections, each represented by its own page. In this guide, we’ll walk through a solution that accomplishes just that, allowing you to keep your bottom navigation bar visible, even when navigating to new pages.

Introduction to the Problem

Imagine you have a Flutter app with a bottom navigation bar that includes different items like Profile, About Us, Home, Notifications, and Cart. Each of these items has a corresponding page. The issue arises when you navigate to a new page (for example, from the Home page). The bottom navigation bar disappears, which can lead to a less cohesive user experience.

You want to maintain the bottom navigation bar and also highlight the currently selected index, no matter what page the user visits. The good news is that there’s a way to effectively implement this in Flutter. Let’s break down the steps involved.

Solution Overview

The solution involves creating a structure that allows you to keep the bottom navigation bar visible across all pages by leveraging the MaterialApp widget and a custom overlay. Here’s how you can achieve it step by step:

Step 1: Update Your MainPage Widget

Start with your MainPage widget, where you manage the bottom navigation bar and the selected index:

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Step 2: Define Your Navigation Items

Define the items that will appear in your bottom navigation bar with their corresponding icons and layout:

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Step 3: Manage Page Navigation

Whenever users navigate to a new page (like when clicking a button on the Home page), ensure that the bottom navigation is still included. Here’s an example from the Home page:

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Step 4: Create New Page within the Main Structure

When creating a NewPage, modify it to remain within the main layout and reflect the bottom navigation bar:

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Step 5: Utilize Overlay to Maintain Bottom Navigation Bar

Finally, wrap your MaterialApp with an overlay to retain the bottom navigation on every page:

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

Conclusion

By structuring your Flutter app this way, you can ensure that the bottom navigation bar remains visible across all pages, enhancing the user experience. Make sure to test the navigation flow thoroughly to ensure that the correct pages are displayed and that the current index is updated as expected. Happy coding!