![]() Indeed, the macro will also make a class conform to the ObservableObject protocol, as well as have each persisted property behave as a property. While simple types, including Bool, Int, and String, are supported out-of-the-box, more complex types must conform to the Codable protocol in order to be used in a persistent class.Īs mentioned, SwiftData is particularly suited for use with SwiftUI. According to Apple, persistent objects are fetched from and updated to the persistent storage when required. Thanks to this additional logic, completely transparent to the developer, SwiftData is able to map all properties to the underlying storage. Under the hood, the macro will apply the to each property in Recipe, as well as add initialization code and other required properties to the class implementation. Note how SwiftData relies on a new macro feature introduced in Swift 5.9. This is how you can define a simple model: Recipe var name: String SwiftData takes the opposite approach, where the code is the source of truth about the persistent data model. The stubs provide base classes used as base classes for the actual model classes. ![]() xcdatamodeld file is therefore the source of truth, which is then used to automatically generate stubs. While it provides an API that enabled the definition of persistent models, albeit in a rather cumbersome way, Core Data is usually used through the Schema Model Editor integrated in Xcode. ![]() ![]() SwiftData can easily make a Swift class into a persistent model and is especially suited to be used with SwiftUI.Īfter radically changing the way UIs can be defined on its platforms a few years ago with SwiftUI, Apple is now moving its first steps to move beyond Core Data, an ORM-based persistency framework strictly tied to Objective-C dynamic capabilities. At WWDC 2023, Apple introduced SwiftData, a new framework that provides a declarative, Swift-first API enabling to work with data persistence in iOS apps. ![]()
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