Fixing the onDelete Issue in SwiftUI's ForEach: Troubleshoot Your Swipe Gestures

Learn how to fix the issue with the `onDelete` modifier in SwiftUI when swiping to delete items from a list. Get a step-by-step guide to troubleshoot and solve your problem efficiently.
---
This video is based on the question https://stackoverflow.com/q/68069539/ asked by the user 'TimD' ( https://stackoverflow.com/u/1573326/ ) and on the answer https://stackoverflow.com/a/68069933/ provided by the user 'Asperi' ( https://stackoverflow.com/u/12299030/ ) 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: onDelete is attached to ForEach but there's no swipe gestures

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.
---
Troubleshooting onDelete in SwiftUI's ForEach: A Step-by-Step Guide

If you're using SwiftUI to create beautiful apps but have encountered a hiccup with the .onDelete() modifier, you're not alone. Many developers face issues where swipe gestures for deleting items in a list simply do not work, even when the code compiles without any errors. If you're in this situation, don't worry! This guide will guide you through understanding and fixing this issue.

Understanding the Problem

In SwiftUI, the .onDelete() modifier is a powerful tool that allows users to swipe left on items in a ForEach and delete them from a list. However, there could be reasons why you might be experiencing difficulties with this gesture. In your case, the inability to swipe to delete or even trigger the Edit mode suggests that there might be a placement issue in your code.

Let's take a look at the example where the .onDelete() is attached directly to the ForEach, but it seems that the swipe gestures aren’t functioning as intended.

Common Causes of the Issue

Placement of Modifiers: In SwiftUI, the sequence in which you apply modifiers can significantly affect the behavior of your UI components.

List and ForEach Configuration: The way you configure your List and ForEach can also impact the interactions.

Other UI elements: Components placed on the navigation bar may sometimes overshadow the interaction capabilities.

The Solution

To ensure that your swipe-to-delete feature works seamlessly, you need to adjust the placement of your .onDelete() modifier.

Step-by-Step Fix

Here’s how to correct your code:

Move the .onDelete() Modifier: The first thing you need to do is attach the .onDelete() modifier directly to the ForEach instead of placing it after the List.

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

Test Your Changes: Once you've rearranged your code, test it again. Tap the Edit button or try swiping to delete an item. This should now work flawlessly.

Understanding the deleteMedicines Function

Your deleteMedicines function handles the actual deletion of items from your data context. Here's a refresher on how it looks:

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

Key Takeaways

Modifier Placement Matters: The order in which you apply SwiftUI modifiers can greatly influence UI behavior.

Direct Attachment: By ensuring your swipe actions are connected to the correct components, your app will perform as expected.

Debugging in SwiftUI: Testing small changes can help identify issues quickly, so keep refining your code iteratively.

In conclusion, when facing difficulties with swipe-to-delete in SwiftUI, checking the arrangement of your code's modifiers is often the key to resolving the problem. By following the steps outlined above, you should be able to restore functionality to your app, ensuring a better user experience. Happy coding!