Скачать или смотреть How to Undo a SwiftUI Swipe Action on a List Cell

Learn how to programmatically undo a `swipe action` in SwiftUI when the app is deactivated. This guide provides step-by-step solutions and code snippets for effective implementation.
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How to Undo a SwiftUI Swipe Action on a List Cell

If you are developing an app using SwiftUI, you may have encountered a scenario where you want to allow users to swipe on a list cell to reveal actions, such as delete or edit. However, a common issue arises when the app is deactivated – for instance, when switching to another app or locking the screen – and the list remains in the swiped state. This can lead to confusion for users when they return to the app, as they may not remember the state of the list.

In this guide, we will explore how to programmatically undo a swipe action in a SwiftUI List when the app is deactivated. You’ll learn how to handle this elegantly using SwiftUI’s scene phase monitoring to keep the user experience smooth and intuitive.

Understanding the Problem

When a user swipes on a list cell to reveal actions:

What happens? The cell stays in that swiped state even when the app is deactivated.

Why is it a problem? Users may return to the app unaware of their previous actions, leading to confusion and potentially resulting in mistaking the state of the app.

The Solution Overview

We'll use SwiftUI’s @Environment to observe the app's scene phase, specifically listening for when the app goes inactive. Upon this event, we will trigger a re-render of the list cells, effectively resetting their swipe state.

Steps to Implement the Solution

Create a View: We will define a SwiftUI view that contains a list of items.

Track the Scene Phase: Use @Environment(.scenePhase) to observe the app's current active state.

Reset State on Inactivity: By changing a state variable, we can force a redraw of the List, resetting any swiped cells.

Code Implementation

Here's how you can implement the solution in your SwiftUI project:

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

Code Breakdown

Environment Variable: We use @Environment(.scenePhase) var scenePhase to monitor the app's scene phase.

State Management: The @State var id: UUID variable is used to store a unique identifier for our List. Changing this identifier will cause SwiftUI to redraw the List.

Swipe Actions: We specify swipe actions for each cell using the swipeActions modifier.

Redraw on Inactive: In the .onChange modifier, we check if the scene phase is inactive. If so, we generate a new UUID, which will reset the List view and undo any swiped cells.

Conclusion

By following these steps, you can easily manage swipe actions in SwiftUI lists and enhance the overall user experience in your application. This method ensures that when users return to your app after a deactivation, they find the list in its intended state, preventing any confusion or misunderstanding regarding the functionality of the app.

Implementing this solution is a great way to improve the usability of your SwiftUI application and provide a seamless experience for your users. Happy coding!