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State | Apple Developer Documentation

developer.apple.com · 185 words · saved by 1 readers

Use state as the single source of truth for a given value type that you store in a view hierarchy. Create a state value in an App, Scene, or View by applying the @State attribute to a property declaration and providing an initial value. Declare state as private to prevent setting it in a memberwise initializer, which can conflict with the storage management that SwiftUI provides: SwiftUI manages the property’s storage. When the value changes, SwiftUI updates the parts of the view hierarchy that depend on the value. To access a state’s underlying value, you use its wrappedValue property. However, as a shortcut Swift enables you to access the wrapped value by referring directly to the state instance. The above example reads and writes the isPlaying state property’s wrapped value by referring to the property directly. Declare state as private in the highest view in the view hierarchy that needs access to the value. Then share the state with any subviews that also need access, either direc

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