expo-ui-swift-ui – Design & UI skill for AI agents

> The instructions in this skill apply to SDK 55 only. For other SDK versions, refer to the Expo UI SwiftUI docs for that version for the most accurate information.

When to Use

• You need to build iOS-native UI in Expo using @expo/ui/swift-ui.
• The task involves selecting SwiftUI views or modifiers, wrapping trees in Host, or embedding React Native components with RNHostView.
• You are targeting Expo SDK 55 behavior for SwiftUI integration and extension guidance.

Installation

npx expo install @expo/ui

A native rebuild is required after installation (npx expo run:ios).

Instructions

• Expo UI's API mirrors SwiftUI's API. Use SwiftUI knowledge to decide which components or modifiers to use.
• Components are imported from @expo/ui/swift-ui, modifiers from @expo/ui/swift-ui/modifiers.
• When about to use a component, fetch its docs to confirm the API - https://docs.expo.dev/versions/v55.0.0/sdk/ui/swift-ui/{component-name}/index.md
• When unsure about a modifier's API, refer to the docs - https://docs.expo.dev/versions/v55.0.0/sdk/ui/swift-ui/modifiers/index.md
• Every SwiftUI tree must be wrapped in Host.
• RNHostView is specifically for embedding RN components inside a SwiftUI tree. Example:

import { Host, VStack, RNHostView } from "@expo/ui/swift-ui";
import { Pressable } from "react-native";

<Host matchContents>
  <VStack>
    <RNHostView matchContents>
      {/* Pressable is a React Native component, embedded through RNHostView. */}
      <Pressable />
    </RNHostView>
  </VStack>
</Host>;

• If a required modifier or View is missing in Expo UI, it can be extended via a local Expo module. See: https://docs.expo.dev/guides/expo-ui-swift-ui/extending/index.md. Confirm with the user before extending.

Limitations

• APIs target SDK 55; check that version’s actual Expo docs and installed package before editing. Android/iOS examples are platform-specific, not interchangeable or proof of real-device behavior. Existing framework and user requirements take precedence.
• Native rebuilds install/execute dependencies and change the project; review the intended development target first. icon.xml and app code are application assets, not bundled files.
• Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
• Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.