Overview

SwiftData makes it easy to persist data using declarative code. You can query and filter data using regular Swift code. And it’s designed to integrate seamlessly with SwiftUI.

Related docs：

• https://developer.apple.com/xcode/swiftdata/
• https://developer.apple.com/documentation/swiftdata

Preserving

Model

@Model

import SwiftData

@Model
class Trip {
    var name: String
    var destination: String
    var startDate: Date
    var endDate: Date
    var accommodation: Accommodation?
}

Customize persistence behavior

@Attribute

@Attribute(.unique) var name: String

@Relationship

@Relationship(.cascade) var accommodation: Accommodation?

@Transient

temporary data that doesn’t need saving.

@Transient var destinationWeather = Weather.current()

Configure Container

ModelContainer

ModelConfiguration

Save Model for later use

ModelContext

import SwiftUI
import SwiftData

struct ContentView: View {
    @Environment(\.modelContext) private var context
}

Query to display

@Query

FetchDescriptor

Syncing

Building

Adding

Adopting