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---
name: ios
description: iOS engineering rules — permissions, code signing, Swift/SwiftUI. Load for iOS targets.
---
## Scope
This skill is the **engineering** half of iOS support: platform rules that apply to any iOS task — permissions, signing, distribution, and native code standards.
The **design** half lives in `skills/mobile/ios-hig/SKILL.md` (navigation patterns, controls, typography, layout, Dark Mode, accessibility). Load it **only when the task touches UI** — screen layout, navigation, visual or interaction design. A signing, build, or non-UI logic task does not need it.
## Design & UX (non-negotiable, applies even to non-UI tasks)
- Respect the **Safe Area** — never place interactive elements behind notches, home indicators, or Dynamic Island
- Support **Dynamic Type** — use semantic text styles (`UIFont.preferredFont`, `Text().font(.body)`) instead of fixed sizes
- Support both light and dark mode using semantic system colors only
## Permissions & Privacy
- Request permissions only at the moment they are first needed (not at launch)
- Provide a clear in-app rationale before the OS permission dialog appears
- Handle all permission states: `notDetermined`, `authorized`, `denied`, `restricted`
- Populate every required `NSUsageDescription` key in `Info.plist` before submitting to App Store
- **Privacy Manifest** (`PrivacyInfo.xcprivacy`): required for apps using certain APIs (file timestamps, user defaults, disk space) — add it before App Store submission
## Code Signing & Distribution
- Always use **Automatic Signing** in Xcode for development; switch to **Manual Signing** for CI/CD
- Distribution certificate + provisioning profile must match the `bundleIdentifier` exactly
- Use **TestFlight** for all pre-production builds — never distribute `.ipa` files directly
- Increment `CFBundleVersion` (build number) for every TestFlight build; increment `CFBundleShortVersionString` only for user-visible releases
## Native Swift / SwiftUI Standards
- Prefer **SwiftUI** for new screens; use **UIKit** only when SwiftUI cannot achieve the required behavior
- Use `@StateObject` for objects owned by the view, `@ObservedObject` for injected objects, `@EnvironmentObject` for app-wide state
- `async/await` over completion handlers for all new async code
- Never force-unwrap (`!`) without a guard or a comment justifying why it cannot be nil
