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SwiftUI
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SwiftUI.md

Summary of SwiftUI Property Wrappers

Property Wrapper Purpose Ownership Lifetime Ideal Use Case
@State Local, private value type state for a single view. View View's lifetime Simple UI state (toggles, text fields, counters)
@Binding Two-way connection to a value owned by an ancestor view. Ancestor View Ancestor's state's lifetime Passing mutable state to child/reusable components
ObservableObject (Protocol) A class that can emit changes to its @Published properties. N/A Depends on how it's created (@StateObject, etc.) Complex data models, services, network data
@StateObject Creates and owns an instance of an ObservableObject within a view. View View's lifetime When a view is the primary owner of an ObservableObject
@EnvironmentObject Accesses an ObservableObject provided by an ancestor in the environment. Ancestor View Ancestor's environment object's lifetime Global, shared, application-wide data
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