SwiftData

1. Model

import SwiftData

@Model
class Todo {
    var title: String
    var isComplete: Bool
    var createdAt: Date

    init(title: String) {
        self.title = title
        self.isComplete = false
        self.createdAt = Date()
    }
}

2. Container Setup

@main
struct MyApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
        .modelContainer(for: [Todo.self])
    }
}

3. Query Data

struct TodoList: View {
    @Query var todos: [Todo]

    var body: some View {
        List(todos) { todo in
            Text(todo.title)
        }
    }
}

// With sort
@Query(sort: \Todo.createdAt, order: .reverse)
var todos: [Todo]

// With filter
@Query(filter: #Predicate<Todo> { !$0.isComplete })
var incompleteTodos: [Todo]

4. Insert/Delete

struct TodoList: View {
    @Environment(\.modelContext) var context
    @Query var todos: [Todo]

    func addTodo() {
        let todo = Todo(title: "New Task")
        context.insert(todo)
    }

    func deleteTodo(_ todo: Todo) {
        context.delete(todo)
    }
}

5. Relationships

@Model
class Category {
    var name: String
    @Relationship(deleteRule: .cascade)
    var todos: [Todo] = []
}

@Model
class Todo {
    var title: String
    var category: Category?
}

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📝 So với Core Data

SwiftData	Core Data
Swift-native	Objective-C origin
Macro-based	Model editor
Simpler API	More features
iOS 17+	iOS 3+