Скачать или смотреть How to Filter with a SwiftUI Search Bar Only After Clicking the "Search" Button

Learn how to optimize your SwiftUI app's search functionality by executing search queries only after the "Search" button is clicked, improving performance and user experience.
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This video is based on the question https://stackoverflow.com/q/64278391/ asked by the user 'iSoldier' ( https://stackoverflow.com/u/11743133/ ) and on the answer https://stackoverflow.com/a/64279178/ provided by the user 'Ludyem' ( https://stackoverflow.com/u/4042366/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Enhancing SwiftUI Search Functionality: Execute Filter Only on "Search" Click

When developing applications using SwiftUI, you might encounter performance issues when filtering long lists through a search feature. This problem typically arises when the application processes a search query every time a character is typed, resulting in sluggish behavior. Users may experience delays that can detract from their overall experience. In this guide, we will explore a solution that allows you to execute filtering only after the "Search" button is clicked on the keyboard.

The Problem

Imagine you have a long list of items, such as documents or database records, and you want users to filter this list using a search bar. By default, most implementations will trigger a search every time the user types a character, which can make the app feel slow due to repeated filtering operations.

What we want to achieve: Trigger filtering only after the user clicks the "Search" button on the keyboard, allowing for a smoother user experience.

The Solution

To address this issue, we need to change how we handle the searchBar delegate within the SearchBar structure. Specifically, we’ll adjust the way the search term is updated. Here's how to do it:

Step 1: Modify the Coordinator Class

In your existing Coordinator class, you’ll need to comment out the textDidChange function and redefine the searchBarSearchButtonClicked function to update the text only when the search button is clicked. Below is the modification:

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

Step 2: Implementing the Change

Here’s what the complete updated SearchBar structure should look like with the new modifications:

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

Step 3: Update the Filter Logic

Now that the search term is only updated when the "Search" button is clicked, ensure that your filter logic inside the List is still appropriately referencing the updated searchTerm variable so filtering occurs with the newly captured term.

Benefits of This Approach

Performance: By reducing unnecessary computations, your app will have better responsiveness and smoother interactions.

User Experience: Users can type their queries without experiencing lag, leading to a more effective and enjoyable search experience.

Conclusion

Filtering a long list only after the user has clicked the "Search" button can significantly enhance performance and user experience in SwiftUI applications. By adjusting your search bar implementation as shown above, you can minimize the overhead caused by redundant search operations. Implement these changes and witness a smoother, faster application that keeps users engaged.

Now, go ahead and apply this technique to your own SwiftUI applications to leverage improved search performance!