how do I search using CoreData

To search using CoreData, you can leverage the new features introduced in iOS 18, which include the ability to build complex predicates using Foundation's new expression macro. Here’s a brief overview of how you can implement search functionality:

Add a Search Bar: Start by adding a search bar to your app's user interface. This will allow users to input their search queries.
Build a Predicate: Use the search text from the search bar to build a predicate. A predicate is a logical condition that can be used to filter data. For example, you can create a predicate to check if a trip's name contains the search text.
Compound Predicate: If the search text might apply to more than one property (e.g., trip's name and destination), you can build a compound predicate to check multiple properties.
Expression Macro: New in iOS 18, the expression macro allows you to build complex predicates easily. Expressions can represent complex evaluations using a model's properties and can be composed within predicates to tailor the results of queries even further.

Here is a simple example of how you might implement this in code:

import CoreData

// Assuming you have a search bar and a managed object context
let searchText = "search query"
let context: NSManagedObjectContext = ...

// Create a predicate to filter trips by name or destination
let namePredicate = NSPredicate(format: "name CONTAINS[cd] %@", searchText)
let destinationPredicate = NSPredicate(format: "destination CONTAINS[cd] %@", searchText)
let compoundPredicate = NSCompoundPredicate(orPredicateWithSubpredicates: [namePredicate, destinationPredicate])

// Fetch request with the compound predicate
let fetchRequest: NSFetchRequest<Trip> = Trip.fetchRequest()
fetchRequest.predicate = compoundPredicate

do {
    let results = try context.fetch(fetchRequest)
    // Handle the results
} catch {
    // Handle the error
}

For more detailed information, you can refer to the session What’s new in SwiftData (09:47).

Additionally, if you are interested in integrating search functionality with Spotlight, you can look into the session Support semantic search with Core Spotlight (00:51) which covers how to build a full search experience in your app using Core Spotlight.