keypaths in swift
Generated on 9/19/2024
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In the context of Swift, keypaths are used to reference properties of types in a type-safe manner. In the session titled "What’s new in SwiftData" at WWDC 2024, it was mentioned that SwiftData can generate and save metadata in a container to make queries for specified keypaths faster and more efficient. By declaring which properties should be indexed, you can optimize queries that frequently involve sorting and filtering, such as those using name, start, and end date properties in an app like Trips. This is achieved using the index macro to specify keypaths, which enhances the performance of queries in SwiftUI with the predicate macro and expressions.
For more details, you can refer to the session What’s new in SwiftData (12:23).
What’s new in SwiftUI
Learn how you can use SwiftUI to build great apps for any Apple platform. Explore a fresh new look and feel for tabs and documents on iPadOS. Improve your window management with new windowing APIs, and gain more control over immersive spaces and volumes in your visionOS apps. We’ll also take you through other exciting refinements that help you make expressive charts, customize and layout text, and so much more.
A Swift Tour: Explore Swift’s features and design
Learn the essential features and design philosophy of the Swift programming language. We’ll explore how to model data, handle errors, use protocols, write concurrent code, and more while building up a Swift package that has a library, an HTTP server, and a command line client. Whether you’re just beginning your Swift journey or have been with us from the start, this talk will help you get the most out of the language.
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”.