The @FetchRequest property wrapper in SwiftUI

A @FetchRequest property wrapper provided by SwiftUI allows us to fetch data from a Core Data store in a SwiftUI view.

A basic fetch request to fetch a list of Item entities looks likes this:

@FetchRequest(
    sortDescriptors: [])
private var items: FetchedResults<Item>

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The @FetchRequest above is applied to the items property of type FetchedResults<Item>. FetchedResults is a collection type, so we can use it in a List the same way as an array.

List {
    ForEach(items) { item in
        Text("Item \(item.name ?? "")")
    }
}

To filter or sort the results, FetchRequest offers sortDescriptors and predicate as parameters.

@FetchRequest(
    sortDescriptors: [NSSortDescriptor(keyPath: \Item.date, ascending: true)],
    predicate: NSPredicate(format: "name BEGINSWITH %@", "t")
)
private var items: FetchedResults<Item>

The fetch request above will deliver items that start with the letter t and are sorted by their date attribute.

Note: The fetch request and its results use the managed object context stored in the environment. For that reason, we need to inject a Core Data managed object context into the environment before using it. Check out this guide on using Core Data with SwiftUI to learn more.

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