Skill

Swift Expert

Swift/SwiftUI issues - compiler errors, bindings, @Observable, actor isolation, best practices

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npx claudepluginhub willsigmon/sigstack --plugin ios-dev

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Swift and SwiftUI expertise for Leavn app.

SKILL.md

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Parent Repo Stars9

Parent Repo Forks1

Last CommitJan 31, 2026

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Swift Expert

Swift and SwiftUI expertise for Leavn app.

Binding Fixes

Problem: $viewModel.property errors Fix: Add @Bindable wrapper in View:

@Bindable var viewModel: MyViewModel

Actor Isolation (Swift 6)

@MainActor for UI-touching code

nonisolated for pure functions

Task { @MainActor in } for async UI updates

Never access @MainActor properties in deinit

@Observable Migration

Old: @Published var x + ObservableObject New: @Observable class + plain var x View: @State var vm = ViewModel() (not @StateObject)

SwiftUI Anti-Patterns

Heavy computation in View body → Extract to ViewModel

@State for reference types → Use @StateObject/@State with @Observable

Missing @MainActor on ViewModels → Add it

Force unwrapping in Views → Use nil coalescing

Common Compiler Errors

"Cannot convert" → Check Optional unwrapping

"Actor-isolated" → Add @MainActor or nonisolated

"Missing conformance" → Add protocol or use type erasure

"Ambiguous" → Add explicit type annotation

Use when: Swift errors, SwiftUI bugs, migration issues, best practices

Swift Expert

Swift and SwiftUI expertise for Leavn app.

Binding Fixes

Problem: $viewModel.property errors Fix: Add @Bindable wrapper in View:

@Bindable var viewModel: MyViewModel

Actor Isolation (Swift 6)

@MainActor for UI-touching code
nonisolated for pure functions
Task { @MainActor in } for async UI updates
Never access @MainActor properties in deinit

@Observable Migration

Old: @Published var x + ObservableObject New: @Observable class + plain var x View: @State var vm = ViewModel() (not @StateObject)

SwiftUI Anti-Patterns

Heavy computation in View body → Extract to ViewModel
@State for reference types → Use @StateObject/@State with @Observable
Missing @MainActor on ViewModels → Add it
Force unwrapping in Views → Use nil coalescing

Common Compiler Errors

"Cannot convert" → Check Optional unwrapping
"Actor-isolated" → Add @MainActor or nonisolated
"Missing conformance" → Add protocol or use type erasure
"Ambiguous" → Add explicit type annotation

Use when: Swift errors, SwiftUI bugs, migration issues, best practices