Скачать или смотреть How to Make SliverAppBar Always Show Shadow in Flutter

Discover how to effectively implement `SliverAppBar` with a constant shadow in Flutter's expanded mode using a simple property adjustment.
---
This video is based on the question https://stackoverflow.com/q/69489331/ asked by the user 'Sunshine' ( https://stackoverflow.com/u/16516595/ ) and on the answer https://stackoverflow.com/a/69508500/ provided by the user 'Md. Yeasin Sheikh' ( https://stackoverflow.com/u/10157127/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to SliverAppBar Always Show Shadow - Expanded mode too

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Make SliverAppBar Always Show Shadow in Flutter

In Flutter development, creating a seamless user interface is essential. One common challenge developers encounter is ensuring that SliverAppBar displays a shadow, even when in an expanded state. This shadow adds depth to your application's UI, making it visually appealing and user-friendly. In this guide, we’ll walk you through the solution to this issue, making your SliverAppBar show a shadow continuously, no matter its state.

Understanding SliverAppBar

SliverAppBar is a special type of app bar in Flutter that integrates with a CustomScrollView. It can change size, collapse, and expand on scroll, making it a useful widget for creating beautiful scroll-based layouts. By default, you might notice that the elevation—which is responsible for the shadow effect—is only shown when the SliverAppBar is collapsed. However, there is a simple way to ensure that your app bar maintains its shadow, even in the expanded state.

Why a Shadow is Important

Aesthetic Appeal: Shadows create a sense of depth which enhances the visual experience of your app.

User Guidance: A shadow can signal to users that the app bar is actionable or visually distinct from the content below.

Enhanced UX: A consistent shadow reinforces the consistency of the design, making it easier for users to navigate.

The Solution: forceElevated Property

Step-by-Step Implementation

To allow the SliverAppBar to display a shadow in the expanded state, you need to set the forceElevated property to true. Here is how you can do it:

Locate Your SliverAppBar: Find the section of your code where your SliverAppBar is defined.

Update the Property: Modify the SliverAppBar as shown below.

Sample Code Implementation

Here's a code snippet that demonstrates how to utilize the forceElevated property:

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

Key Changes

forceElevated: true: This crucial property allows the app bar to show elevation regardless of whether it's scrolling or expanded. By default, this is set to false, which is why you weren’t seeing the shadow in the expanded state.

elevation Value: Adjust the elevation parameter to change the intensity of the shadow effect. The adjustment of this value can significantly impact how prominent or subtle the shadow appears.

Conclusion

By simply tweaking your SliverAppBar and utilizing the forceElevated property, you can ensure that your app bar consistently displays a shadow, enhancing your app's overall design and user experience. This small adjustment can make a big difference, allowing your UI to look polished and professional. Try this out in your next Flutter project and see the difference it makes!