Resolving UISearchBar Data Mismatch in Swift

Описание: Learn how to fix the issue of mismatched data in UISearchBar with this detailed guide. Understand how to filter your data source correctly to ensure the selected title corresponds with proper item data in your ListViewController.
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This video is based on the question https://stackoverflow.com/q/64407378/ asked by the user 'Nicolas G' ( https://stackoverflow.com/u/14423906/ ) and on the answer https://stackoverflow.com/a/64415867/ provided by the user 'vadian' ( https://stackoverflow.com/u/5044042/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving UISearchBar Data Mismatch in Swift: A Comprehensive Guide

If you’re developing an iOS application and utilizing the UISearchBar, you may have encountered a frustrating issue where the title that is clicked does not correspond with the data displayed in your ListViewController. This common problem arises particularly when filtering through a list of items based on user input in the search bar. Let's unpack this issue and explore how to effectively resolve it.

Understanding the Problem

As described in a typical scenario, when you type a string like "New" into your UISearchBar, you expect to see relevant titles such as New Haven and New York appear. However, upon selecting one of these titles, it may incorrectly redirect you to data associated with a different title, such as Ann Arbor. This discrepancy is often a result of not properly managing the data source after filtering the results based on the search criteria.

Example of the Mismatch

User Input: New

Filtered Titles: New Haven (index 1) and New York City (index 2)

Incorrect Selection: Selecting New Haven shows data for Ann Arbor instead of the expected items.

Step-by-Step Solution

Step 1: Revise Your Data Structure

To fix the underlying issue, we first need to ensure that your data structure is appropriate for the filtering that is taking place. Instead of using a string array for filteredData, it should be an array of the Category struct. Here’s how to declare it correctly:

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

Step 2: Update viewDidLoad

In your viewDidLoad method, set filteredData to be equal to your original data array, rather than relying on the titledata array which is simply string titles.

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

Step 3: Modify didSelectRowAt

When a title is selected from the filtered results, you need to ensure you're referencing the appropriate object from filteredData. Update the implementation in didSelectRowAt:

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

Step 4: Optimize the searchBar(_:textDidChange:) Method

The method where you filter the search results also requires optimization. Instead of looping through titledata and reloading the table view multiple times, you can do the following for better performance:

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

Step 5: Update cellForRowAt

Lastly, ensure that your cell population method utilizes the filtered data as well:

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

Bonus: Adding Animation

For a smoother user experience, consider implementing UITableViewDiffableDataSource to animate the table view when your data source array changes. This adds a polished feel to your app.

Conclusion

By following the steps arranged above, you will resolve the issue of mismatched data when using a UISearchBar alongside a UITableView. This approach not only fixes the immediate problem but also sets a strong foundation for managing your data effectively as your app grows. Happy coding!