How to Implement a Delete Button in SwiftUI with Core Data

Описание: Learn how to add a working `delete` button for each row in a SwiftUI list using Core Data, instead of just deleting the first row every time!
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This video is based on the question https://stackoverflow.com/q/65938607/ asked by the user 'jh h' ( https://stackoverflow.com/u/15099190/ ) and on the answer https://stackoverflow.com/a/65939388/ provided by the user 'Raja Kishan' ( https://stackoverflow.com/u/14733292/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Implementing a Delete Button in SwiftUI with Core Data

In today's post, we're tackling a common problem faced by developers working with SwiftUI and Core Data: how to implement a delete button for each row in a list, without relying on a swipe-to-delete gesture. If you've ever found yourself frustrated by the inability to remove entries from your list dynamically, this guide will walk you through the solution step by step.

Understanding the Problem

Imagine you have a list of items fetched from Core Data displayed in your SwiftUI app. You've incorporated a delete button next to each item, but whenever you hit the button, it's only ever deleting the first item in the list. This happens because the action you have associated with the delete button is always targeting the first index (0). In order to effectively delete the item that corresponds to the button tapped, you need to reference its correct index in the list.

The Solution

To fix this issue, you will need to pass the correct index of the item you want to delete, rather than continuously targeting IndexSet.init(arrayLiteral: 0). Here’s how you can accomplish that:

Step-by-Step Code Adjustment

Modify the Body View:
Instead of using ForEach(savings, id : .self), switch to ForEach(savings.indices, id: .self). This allows you to iterate over the indices of the items, providing you with the correct index for each item in the list.

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

Update the Delete Function:
Modify your delete function to accept an Int index parameter. Use this index to correctly delete the item from Core Data.

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

Summary of Changes

Use savings.indices: This change allows you to access each index in the savings array dynamically.

Pass Correct Index: When the delete button is pressed, the correct index of the item is passed to the delete function.

Update Delete Logic: The delete function now references the item by its actual index, enabling targeted deletion.

Final Thoughts

By following these adjustments, you can empower your SwiftUI application to handle row deletions more efficiently. No more deleting the first item over and over! With these changes, each delete button will accurately remove the intended item from your Core Data entity.

Feel free to experiment and expand upon this functionality to enhance your app's user experience further. Happy coding!