ios-development

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• SKILL.md

SKILL.md (first lines)

# iOS/iPadOS/tvOS Development

Comprehensive guide for building native Apple platform applications.

## Platforms Covered

| Platform | Minimum Target | Current     |
| -------- | -------------- | ----------- |
| iOS      | iOS 15.0+      | iOS 17+     |
| iPadOS   | iPadOS 15.0+   | iPadOS 17+  |
| tvOS     | tvOS 15.0+     | tvOS 17+    |
| watchOS  | watchOS 8.0+   | watchOS 10+ |

---

## SwiftUI (Preferred for New Projects)

### Basic Structure

```swift
import SwiftUI

@main
struct MyApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

struct ContentView: View {
    @State private var count = 0

    var body: some View {
        VStack(spacing: 20) {
            Text("Count: \(count)")
                .font(.largeTitle)

            Button("Increment") {
                count += 1
            }
            .buttonStyle(.borderedProminent)
        }
        .padding()
    }
}
```

### State Management

```swift
// Local state
@State private var text = ""

// Binding (child components)
@Binding var isPresented: Bool

// Observable object
@StateObject private var viewModel = MyViewModel()
@ObservedObject var viewModel: MyViewModel

// Environment
@Environment(\.dismiss) private var dismiss
@Environment(\.colorScheme) private var colorScheme
@EnvironmentObject var appState: AppState

// App Storage (UserDefaults)
@AppStorage("username") private var username = ""
```

### Modern Concurrency

```swift
// Async/await
func fetchData() async throws -> [Item] {
    let url = URL(string: "https://api.example.com/items")!
    let (data, _) = try await URLSession.shared.data(from: url)
    return try JSONDecoder().decode([Item].self, from: data)
}

// In View
.task {
    do {
        items = try await fetchData()
    } catch {
        errorMessage = error.localizedDescription
    }
}

// Main actor for UI updates
@MainActor
class ViewModel: ObservableObject {
    @Published var items: [Item] = []

    func load() async {
        items = try? await fetchData()
    }
}
```

### Navigation (iOS 16+)

```swift
// NavigationStack with typed destinations
struct ContentView: View {
    @State private var path = NavigationPath()

    var body: some View {
        NavigationStack(path: $path) {
            List(items) { item in
                NavigationLink(value: item) {
                    Text(item.name)
                }
            }
            .navigationDestination(for: Item.self) { item in
                DetailView(item: item)
            }
        }

From travisjneuman/.claude, MIT.

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