swiftui-patterns

SKILL.md

SwiftUI 17+ removes ObservableObject boilerplate with @Observable, simplifies environment injection with @Environment, and introduces task-based async patterns. The core principle: use Apple's modern APIs instead of reactive libraries.

| Observable model | @Observable | ObservableObject | | Published property | Regular property | @Published | | Own state | @State | @StateObject | | Passed model (binding) | @Bindable | @ObservedObject | | Environment injection | environment(:) | environmentObject(:) | | Environment access | @Environment(Type.self) | @EnvironmentObject |

| Async on appear | .task { } | .onAppear { Task {} } | | Value change | onChange(of:initial::) | onChange(of:perform:) |

在實現 iOS 17+ SwiftUI 模式時使用：@Observable/@Bindable、MVVM 架構、NavigationStack、延遲加載、UIKit 互操作、可訪問性（VoiceOver/動態類型）、異步操作（.task/.refreshable）或從 ObservableObject/@StateObject 遷移。 來源：johnrogers/claude-swift-engineering。

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