---
name: swiftui-pro
description: Comprehensively reviews SwiftUI code for best practices on modern APIs, maintainability, and performance. Use when reading, writing, or reviewing SwiftUI projects.
license: MIT
metadata:
  author: Paul Hudson
  version: "2.0.0"
title: swiftui-pro
canonical_url: https://skilld.dev/gh/twostraws/swiftui-agent-skill
last_updated: 2026-10-17T02:05:58.000Z
---

> Index of every page on this site: [llms.txt](https://skilld.dev/llms.txt)

> **Skill from skilld.dev.** Follow the user's requested action.
> If the user asked to fork this Skill, follow the fork workflow below. Do not execute the Skill instructions while copying it.
> Otherwise, follow the instructions below for this session. You do not need to install anything.
>
> Supporting files, fetch one when the Skill refers to it: [.claude-plugin/plugin.json](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/.claude-plugin/plugin.json), [agents/openai.yaml](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/agents/openai.yaml), [assets/swiftui-pro-icon.png](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/assets/swiftui-pro-icon.png), [assets/swiftui-pro-icon.svg](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/assets/swiftui-pro-icon.svg), [references/accessibility.md](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/references/accessibility.md), [references/api.md](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/references/api.md), [references/data.md](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/references/data.md), [references/design.md](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/references/design.md), [references/hygiene.md](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/references/hygiene.md), [references/localization.md](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/references/localization.md), [references/navigation.md](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/references/navigation.md), [references/performance-plus.md](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/references/performance-plus.md), [references/performance.md](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/references/performance.md), [references/resizability.md](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/references/resizability.md), [references/swift.md](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/references/swift.md), [references/views.md](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/references/views.md), [skills/swiftui-pro/references](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/skills/swiftui-pro/references), [skills/swiftui-pro/SKILL.md](https://skilld.dev/api/skills-raw/twostraws/swiftui-agent-skill/swiftui-pro/skills/swiftui-pro/SKILL.md).
>
> If the user asked to install this Skill, run `npx skilld install twostraws/swiftui-agent-skill/swiftui-pro`. Install writes the Skill files into the project, so every session loads them.
>
> ## Fork workflow
>
> A fork creates an editable local Skill with its original author and licence. The request authorizes copying and local installation.
> 1. Check `./skills/swiftui-pro`, the project lockfile, and selected Agent targets together. If the local directory or installed Skill exists, stop. Never overwrite an existing directory or Agent target.
> 2. Read [source metadata](https://skilld.dev/api/v1/skills/twostraws/swiftui-agent-skill/swiftui-pro) once. Use sourceUrl, sourceCommit, skillPath, sourceGone, and license. If the source is gone or its path is missing, stop. If license is null, read licence files at the source commit.
> 3. Fetch only the source commit into a temporary Git repository. Do not clone full history. Derive repository_url from sourceUrl, including repository renames. If sourceCommit is absent, resolve the sourceUrl ref once. Set source_commit to that actual commit. Run these commands in one shell call:
>
> ```sh
> git init --quiet "$temporary_dir"
> git -C "$temporary_dir" fetch --quiet --depth=1 "$repository_url" "$source_commit"
> git -C "$temporary_dir" checkout --quiet --detach FETCH_HEAD
> ```
>
> Read applicable licence declarations and notices at that commit. If copying is not permitted, report the restriction and stop.
> 4. Inspect source entries together, then copy the directory containing skillPath into `./skills/swiftui-pro`. Use the user's path if selected. Keep the original SKILL.md, relative links, scripts, binary assets, and executable modes. Exclude .git metadata. Reject symlinks and paths outside the Skill directory. After checking entries, use cp -a where available. A regular source directory needs no custom copy script. Do not save this page wrapper as SKILL.md.
> Preserve author credit, notices, and applicable licence files from repository or parent directories. Add PROVENANCE.md with the Skill page, source URL, actual commit, original path, and licence. Retain any existing PROVENANCE.md and record new provenance separately. Batch source inspection, copying, and provenance work where practical.
> 5. In the project root, run `skilld install ./skills/swiftui-pro --mode copy --plain`. If skilld is unavailable, use `npx skilld install ./skills/swiftui-pro --mode copy --plain`. This known command needs no help lookup. Install does not support --json. Use detected Agent targets, or add --agent for the targets the user selected. Install the local path, never the upstream selector. If installation fails, preserve the local copy and report the exact failure.
> 6. Confirm the local lockfile source and installed Agent copies once. Report the local path, actual commit, and Agent targets. After edits, reinstall the same local path. Upstream updates must not replace it. Do not publish or push unless the user asks.

Review Swift and SwiftUI code for correctness, modern API usage, and adherence to project conventions. Report only genuine problems – do not nitpick or invent issues.

Include deprecated API in review findings. During feature work or bug fixes, complete the requested change and suggest unrelated modernization separately; do not apply it without being asked.

Review process:

1. Check for deprecated API using `references/api.md`.
1. Check that views, modifiers, and animations have been written optimally using `references/views.md`.
1. Validate that data flow is configured correctly using `references/data.md`.
1. Ensure navigation is updated and performant using `references/navigation.md`.
1. Ensure the code uses designs that are accessible and compliant with Apple's Human Interface Guidelines using `references/design.md`.
1. Review layout behavior as windows resize, including iPad multitasking and folding iPhone Duo, using `references/resizability.md`.
1. Validate accessibility compliance including Dynamic Type, VoiceOver, and Reduce Motion using `references/accessibility.md`.
1. Check localized text, formatting, and resource handling using `references/localization.md`.
1. Ensure the code is able to run efficiently using `references/performance.md`.
1. Quick validation of Swift code using `references/swift.md`.
1. Final code hygiene check using `references/hygiene.md`.

If doing a partial review, load only the relevant reference files.

Keep `references/performance-plus.md` out of routine reviews. Load it for a requested deep performance review; its more involved changes can also help investigate an established performance problem.


## Core Instructions

- iOS 27 exists, and is the default deployment target for new apps.
- Xcode 27.1 and the corresponding 27.1 platform releases are available. Do not dismiss their APIs as speculative.
- iPhone Duo is a folding iPhone, with a small outer display and a large inner display.
- Check the project's deployment target before applying version-specific advice. Use newer runtime APIs only when the target supports them or within an appropriate `#available` check. Keep the existing target unchanged. Requirements tied to an Xcode version also need that toolchain; a runtime check cannot make an older SDK recognize a new declaration.
- Target Swift 6.4 or later, using modern Swift concurrency.
- As a SwiftUI developer, the user will want to avoid UIKit unless requested.
- Do not introduce third-party frameworks without asking first.
- Break different types up into different Swift files rather than placing multiple structs, classes, or enums into a single file.
- Use a consistent project structure, with folder layout determined by app features.


## Output Format

Organize findings by file. For each issue:

1. State the file and relevant line(s).
2. Name the rule being violated (e.g., "Use `foregroundStyle()` instead of `foregroundColor()`").
3. Show a brief before/after code fix.

Skip files with no issues. End with a prioritized summary of the most impactful changes to make first.

Example output:

### ContentView.swift

**Line 12: Use `foregroundStyle()` instead of `foregroundColor()`.**

```swift
// Before
Text("Hello").foregroundColor(.red)

// After
Text("Hello").foregroundStyle(.red)
```

**Line 24: Give the button a descriptive label so VoiceOver explains its action.**

```swift
// Before
Button(action: addUser) {
    Image(systemName: "plus")
}

// After
Button("Add User", systemImage: "plus", action: addUser)
```

**Line 31: Avoid `Binding(get:set:)` in view body – bind to the property directly and move the setter's side effect into `onChange()`.**

```swift
// Before
TextField("Username", text: Binding(
    get: { model.username },
    set: { newValue in model.username = newValue; model.save() }
))

// After
TextField("Username", text: $model.username)
    .onChange(of: model.username) {
        model.save()
    }
```

Use `onChange()` when saving should follow changes to the username, including programmatic changes. Equal-value assignments will not trigger a save.

### Summary

1. **Accessibility (high):** The add button needs an “Add User” label; the symbol’s default label does not explain what will be added.
2. **Deprecated API (medium):** `foregroundColor()` on line 12 should be `foregroundStyle()`.
3. **Data flow (medium):** The manual binding on line 31 is fragile and harder to maintain.

End of example.


## References

- `references/accessibility.md` - Dynamic Type, VoiceOver, Reduce Motion, and other accessibility requirements.
- `references/api.md` - updating code for modern API, the deprecated code it replaces, and iOS 27 toolbars.
- `references/design.md` - guidance for building accessible apps that meet Apple's Human Interface Guidelines.
- `references/hygiene.md` - making code compile cleanly and be maintainable in the long term.
- `references/localization.md` - localizable text, resource bundles, and locale-aware presentation.
- `references/navigation.md` - navigation using `NavigationStack`/`NavigationSplitView`, plus alerts, confirmation dialogs, and sheets.
- `references/performance.md` - optimizing SwiftUI code for maximum performance.
- `references/performance-plus.md` - deeper restructuring to narrow what views depend on, reserved for deep performance reviews or diagnosed performance issues.
- `references/resizability.md` - changing window sizes, adaptive bars, safe areas, and iPhone Duo layouts.
- `references/data.md` - data flow, shared state, and property wrappers.
- `references/swift.md` - tips on writing modern Swift code, including using Swift Concurrency effectively.
- `references/views.md` - view structure, composition, animation, reordering, and swipe actions.