Build declarative UI and manage data flow with SwiftUI in iOS. Use when building declarative SwiftUI views or managing data flow with property wrappers.
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Role: iOS UI Expert. Prioritize smooth 60fps, clean data flow.
body clean.@Observable (owning parent creates it once: @State private var vm = MyViewModel()).let/property for passed-in @Observable VMs — no wrapper needed, child views auto-track only the fields they read.ObservableObject VMs):ObservableObject VMs to @Observable when the deployment target allows it — see ios-state-management..padding().background()).PreviewProvider or #Preview for every view.@State/@StateObject VM initialized only once (in parent)?id?body for UI composition only.@ObservedObject inside View settings — this causes leaks and performance issues.ObservableObject VMs on iOS 17+: Use @Observable for new code; reserve ObservableObject/@Published for code that must support pre-17 or already depends on Combine operators.When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
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Upgrade an Android project to Android Gradle Plugin (AGP) 9. Use when migrating to AGP 9, updating Gradle build files, migrating to built-in Kotlin, or adopting the new AGP DSL.
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Apply Clean Architecture layering, modularization, and Unidirectional Data Flow in Android projects. Use when setting up project structure, placing code in layers, configuring feature/core modules, or implementing UDF patterns; defer Compose state and ViewModel/StateFlow implementation to their specific skills.
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Implement WorkManager and background processing correctly on Android. Use when creating Worker classes, scheduling tasks, choosing between WorkManager and Foreground Services, or setting up Hilt in workers; defer FCM and notification delivery to android-notifications.
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Build high-performance declarative UI with Jetpack Compose. Use when writing Composable functions, optimizing recomposition, hoisting state, or working with LazyColumn and side effects; defer deep-link and navigation routing to android-navigation.
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Migrate an Android XML View to Jetpack Compose following a structured 10-step workflow. Use when converting XML layouts to Compose, setting up Compose in an existing View-based project, or incrementally adopting Compose.
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Write correct coroutine scopes, lifecycle collection, and dispatcher injection in Android production code. Use for suspend functions, coroutine scopes, and dispatcher mechanics; defer ViewModel StateFlow/LiveData architecture, Fragment lifecycle recipes, persistence/notifications, and unit-test recipes to their specific skills.
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