SwiftData

Generated on 7/31/2024

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SwiftData is a framework introduced in iOS 17 that simplifies building your app's model layer and persisting it across launches. It provides features such as modeling, migration, graph management, and synchronization with CloudKit. Here are some key points about SwiftData:

  1. Modeling and Persistence: SwiftData allows you to define your schema with a few additions to a normal Swift class, using the model macro. You can further refine it with attributes and relationships to describe how models relate to one another.

  2. Custom Data Stores: By default, SwiftData uses CoreData to store information, but you can also use custom data stores. This flexibility allows you to use backends like SQLite, remote web services, or even JSON files. Custom data stores can be implemented using the new Datastore protocol.

  3. New Features:

    • Index and Unique Macros: These make your queries more efficient and ensure no duplicate entries.
    • History API: Provides access to the history of changes in a datastore, useful for tracking local changes that need to be synced to a remote web service.
    • Previewable Macro: Works great with SwiftData, making it easier to work with your queries while iterating on views.

  4. Xcode Previews: SwiftData integrates well with Xcode previews, allowing you to create custom containers for use with previews, which is beneficial when developing your app with SwiftUI.

For a detailed overview, you can watch the session What’s new in SwiftData.

Relevant Sessions

  1. What’s new in SwiftData
  2. Create a custom data store with SwiftData
  3. Platforms State of the Union (covers SwiftData at various points)

Chapter Markers for "What’s new in SwiftData"

  • 0: Introduction
  • 57: Adopt SwiftData
  • 131: Customize the schema
  • 163: #Unique macro
  • 217: History API
  • 269: Tailor a model container
  • 339: Custom data stores
  • 401: Xcode previews
  • 560: Customize queries
  • 618: #Expression macro
  • 716: #Index macro

Chapter Markers for "Create a custom data store with SwiftData"

  • 0: Introduction
  • 81: Overview
  • 290: Meet DataStore
  • 462: Example store

For more specific details, you can refer to the timestamps and chapters provided.

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Platforms State of the Union

Platforms State of the Union

Discover the newest advancements on Apple platforms.

What’s new in SwiftData

What’s new in SwiftData

SwiftData makes it easy to add persistence to your app with its expressive, declarative API. Learn about refinements to SwiftData, including compound uniqueness constraints, faster queries with #Index, queries in Xcode previews, and rich predicate expressions. Join us to explore how you can use all of these features to express richer models and improve performance in your app. To discover how to build a custom data store or use the history API in SwiftData, watch “Create a custom data store with SwiftData” and “Track model changes with SwiftData history”.

Create a custom data store with SwiftData

Create a custom data store with SwiftData

Combine the power of SwiftData’s expressive, declarative modeling API with your own persistence backend. Learn how to build a custom data store and explore how to progressively add persistence features in your app. To get the most out of this session, watch “Meet SwiftData” and “Model your schema with SwiftData” from WWDC23.