Скачать или смотреть Solving the Issue of a Bottom Sheet Causing Parent View Shifts in SwiftUI

Learn how to address the issue where a bottom sheet toggles and causes the parent view to shift in SwiftUI. Our step-by-step guide provides a clear solution and explanation.
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This video is based on the question https://stackoverflow.com/q/74409884/ asked by the user 'Swink' ( https://stackoverflow.com/u/8023463/ ) and on the answer https://stackoverflow.com/a/74412473/ provided by the user 'whiteio' ( https://stackoverflow.com/u/19222466/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Tackling the Bottom Sheet Parent View Shift in SwiftUI

When building SwiftUI applications, smooth interactions and animations are essential for creating a great user experience. One common pain point many developers encounter is the issue of a bottom sheet toggling while inadvertently shifting the parent view. In this guide, we will explore the root cause of this issue and provide a clear, step-by-step solution to fix it.

The Problem: Parent View Shift

You may find yourself with a bottom sheet in your SwiftUI app that you can toggle on and off. However, when you close this bottom sheet, the content of the parent view shifts unexpectedly. This can lead to a jarring experience for users and disrupt the intended design of your application.

Potential Cause

In the provided example, the main concern revolves around the VStack layout of the parent view containing the text labels and the BottomSheetView itself. Specifically, the issue arises because:

The VStack is vertically laid out with the bottom sheet.

The height computation for the BottomSheetView inadvertently includes the height of the VStack, leading to unwanted shifts when toggling the bottom sheet.

The Solution: Using ZStack to Fix Layout

To prevent the unwanted shifting of the parent view when the bottom sheet is toggled, we can leverage a ZStack. This allows the bottom sheet to be layered on top of the existing views without impacting their layout.

Steps to Implement the Solution

Wrap the Current View in a ZStack:
By encapsulating the current content within a ZStack, we can ensure that the bottom sheet floats above the VStack containing the main interface elements.

Adjust maxHeight Property:
Ensure that the height used for the bottom sheet is calculated correctly. Use the full height of the screen instead of relying on the height of the VStack.

Updated Code Example

Here's how you would implement these changes in your SwiftUI view:

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

Key Changes Explained:

ZStack Usage: The VStack is now wrapped inside a ZStack, allowing the bottom sheet to overlay without affecting the vertical layout of the parent view.

maxHeight Calculation: The maxHeight is adjusted, ensuring it uses the appropriate height calculation for seamless integration.

Conclusion

By implementing a ZStack and ensuring the bottom sheet's height is accounted for correctly, you can resolve the issue of the parent view shifting when toggling the bottom sheet. This approach not only enhances user experience but also reflects a more fluid design in your SwiftUI applications.

We hope this detailed breakdown assists you in creating a more stable and visually appealing experience in your apps. Happy coding!