Скачать или смотреть How to Add Additional Safe Area on NavigationView in SwiftUI

Learn how to manage additional safe area insets in SwiftUI's NavigationView and ensure overlays don't obstruct your views.
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Managing Additional Safe Area Insets in SwiftUI's NavigationView

When developing an app in SwiftUI, you may find that you need to display an overlay that spans your entire application. This often leads to a common issue: ensuring that the underlying content doesn't end up beneath this overlay, especially when it comes to adapting your NavigationView to accommodate additional safe area insets. In this post, we'll explore how to tackle this challenge effectively.

The Challenge: Unresponsive Safe Area Insets

You may have found yourself in a situation similar to the following:

You have an overlay in your NavigationView that should dynamically appear based on a certain condition in your app.

You expect that this overlay will properly adjust the safe area insets, allowing your content to fit appropriately without being obscured.

Unfortunately, the default behavior in SwiftUI seems to ignore adjustments made through .safeAreaInset, leaving your content stuck beneath the overlay.

A SwiftUI-Based Solution

While there might be ways to work around this issue using UIKit's additionalSafeAreaInsets, our focus here will be on a clean SwiftUI solution. Let's break down a method that successfully manages the safe area insets within NavigationView without resorting to UIKit components.

Steps to Implement the Safe Area Solution

1. Create the Main App File

First, you'll set up your main app structure to include a NavigationView and the necessary environment object to manage the safe area updates.

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2. Set Up the Safe Area Controller

Create a shared SafeAreaController that will store information about the additional safe area.

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3. Introduce a Frame Reader

Define a FrameReader view modifier that reads the frame dimensions of the overlay and communicates these updates back to the SafeAreaController:

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4. Update Each Content View

In every view pushed onto the NavigationView, utilize the safe area from the SafeAreaController to create an invisible inset:

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Why This Solution Works

Dynamic Read: The GeometryReader allows the app to dynamically read the size of the overlay during runtime and update the SafeAreaController accordingly.

Environment Sharing: By using the EnvironmentObject, every content view in the navigation stack has access to the updated safe area information.

Invisible Insets: An invisible Color.clear view acts as a safe area inset equal to the height of the overlay, ensuring that underlying content isn't obstructed.

Conclusion

By following the steps outlined in this post, you'll be able to effectively manage safe area insets in your SwiftUI app, preventing overlays from interfering with your main content. This clean and SwiftUI-focused approach keeps your code organized and follows best practices in the Swift ecosystem. Happy coding!