A reference guide for using Expo's bridge to place native SwiftUI views inside React Native iOS apps. It covers layout, controls, navigation, styling, and iOS 26 interface rules.

Use it when building or reviewing Expo screens with native SwiftUI components, moving from React Native controls, handling iOS 26 Liquid Glass, or creating inputs and presentation surfaces.

It helps avoid SwiftUI views that fail to appear, have the wrong size, or ignore styles because they are connected or composed incorrectly.

expo-ui — Skill for Claude Code and Codex by pproenca

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add pproenca/dot-skills --skill expo-ui

Clone the repo

git clone --depth 1 https://github.com/pproenca/dot-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/pproenca/dot-skills/expo-ui.svg)](https://agentmods.dev/skills/pproenca/dot-skills/expo-ui)

Your own site

<a href="https://agentmods.dev/skills/pproenca/dot-skills/expo-ui"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/expo-ui.svg" alt="Measured on agentmods" height="20"></a>

Per session 146 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,485 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00146	$0.02485
Opus 5	$0.00073	$0.01242
Sonnet 5	$0.00029	$0.00497
Haiku 4.5	$0.00015	$0.00248

Measured 7d ago against content hash be7b58df9c84, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

expo-ui scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/.curated/expo-ui/SKILL.md · 144 lines

How it starts

The opening of the file, as written. The whole thing — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Expo @expo/ui SwiftUI Best Practices

Library reference for @expo/ui/swift-ui and @expo/ui/swift-ui/modifiers — the iOS surface of Expo's native UI bridge. Contains 53 rules across 8 categories, prioritised by cascade impact for agents building Expo apps that render to native SwiftUI views on iOS 26 and earlier.

When to Apply

Reference these guidelines when:

Building a new screen with @expo/ui/swift-ui — pick the right container (Form vs List vs ScrollView), wrap in Host correctly, apply modifiers
Migrating from React Native primitives (View, Text, TouchableOpacity) to native SwiftUI components
Targeting iOS 26 features — Liquid Glass material, GlassEffectContainer, new sheet detent behaviours
Reviewing code that imports from @expo/ui/swift-ui or @expo/ui/swift-ui/modifiers
Debugging "the SwiftUI view doesn't render / is the wrong size / ignores styles" — usually a Host or modifier issue
Composing presentation surfaces — Alert, ConfirmationDialog, BottomSheet, Popover — under HIG modality guidance
Writing controlled inputs (TextField, Toggle, Picker, Slider) with useNativeState and worklet writes

When NOT to Use This Skill

Android Jetpack Compose — this skill covers iOS SwiftUI only. The @expo/ui/jetpack-compose surface has its own conventions
Universal (cross-platform) components — @expo/ui exposes a small set; this skill scopes to the platform-specific iOS surface
Navigation routing — for stack/tab routing, use expo-router and expo-router/unstable-native-tabs; this skill covers UI composition only
Pre-iOS-17 fallbacks — most rules assume iOS 17 minimum; Liquid Glass rules require iOS 26

Rule Categories by Priority

Priority	Category	Impact	Prefix
1	Setup & Host Boundaries	CRITICAL	`host-`
2	iOS 26 HIG Composition Rules	CRITICAL	`hig-`
3	Modifiers System	CRITICAL	`mod-`
4	Layout Components	HIGH	`layout-`
5	Input & Controls	HIGH	`input-`
6	Navigation & Overlays	HIGH	`nav-`
7	Display & Feedback	MEDIUM-HIGH	`display-`
8	State & Cross-Cutting Patterns	MEDIUM	`state-`

Read the full file on GitHub · 144 lines

Files

What ships with it

59 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

7d ago First seen · 144 lines · 146 tokens per session scan A be7b58df9c84

Subscribe to this mod's changes

expo-ui is a skill published in the GitHub repository pproenca/dot-skills (202 stars, last pushed 22d ago), licensed MIT. It adds 146 tokens to every session and 2,485 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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