The @FetchRequest property wrapper in SwiftUI

Learn how to request data from the Core Data store in a SwiftUI view

20 Mar 2021 · 2 min read

core data

swiftui

swift

ios

quick tip

A @FetchRequest property wrapper provided by SwiftUI makes it easy to fetch data from a Core Data store in a SwiftUI view.

A basic fetch request looks likes this:

@FetchRequest(
    entity: Item.entity(),
    sortDescriptors: []
) var items: FetchedResults<Item>

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

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

Related tags

core data

swiftui

swift

ios

quick tip

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