Instruction

State & Observable

In a SwiftUI app, every data value or object that can change needs a single source of truth and a mechanism to enable views to change or observe it. Property wrappers like @State and @Observable enable you to declare how each view interacts with mutable data.

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Pre-iOS 17

Before iOS 17, @State and @Binding could only be used with value properties, and you’d use @StateObject and @ObservedObject for class objects. To make a class object observable, you’d declare it like this:

class MyViewModelClass: ObservableObject {
  @Published var modelArray: [MyModel] = []
}

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Using iOS 17 Observation Framework

An iOS 17 or later app can adopt the Observation framework. Observation:

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Yopvuwagtuq zgov a gka-uOF-59 uhd uyu:

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