# IOS UI Navigation

> Implement UIKit navigation, Auto Layout, and Apple Human Interface Guidelines in iOS. Use when implementing UIKit navigation, Auto Layout constraints, or HIG compliance.

- Skill: `hoangnguyen0403/ios-ui-navigation` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds add hoangnguyen0403/ios-ui-navigation`
- Raw SKILL.md: https://api.skillmd.com/api/skills/hoangnguyen0403/ios-ui-navigation/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: HoangNguyen0403 (https://skillmd.com/u/hoangnguyen0403)
- Updated: 2026-08-19
- Page: https://skillmd.com/skills/hoangnguyen0403/ios-ui-navigation

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# iOS UI & Layout Standards

## **Priority: P0 (CRITICAL)**

## Implementation Guidelines

### Auto Layout

- **Code-Based Layout**: Prefer programmatic layout using `NSLayoutAnchor` or SnapKit over Storyboards for better source control.
- **Safe Area**: Always respect `view.safeAreaLayoutGuide`.
- **UIStackView**: Use for linear layouts to reduce constraint complexity.

### UIKit Best Practices

- **View Lifecycle**: Perform layout adjustments in `viewWillLayoutSubviews` or `updateConstraints`.
- **Reusable Views**: Extract complex UI into custom `UIView` subclasses.
- **Image Optimization**: Use SF Symbols for icons. Preferred vector (PDF/SVG) for custom assets.
- **SwiftUI Bridge**: Use `UIViewRepresentable` or `UIViewControllerRepresentable` to host UIKit in SwiftUI.

### Human Interface Guidelines (HIG)

- **Accessibility**: Support Dynamic Type and provide meaningful `accessibilityLabel`.
- **Feedback**: Use `UINotificationFeedbackGenerator` for haptic feedback on actions.
- **Margins**: Follow standard system margins (typically 16-20pt).

## Anti-Patterns

- **No CGRect(x:y:w:h)**: Use Auto Layout.
- **No complex constraint logic in VC**: Use UIStackView or custom views.
- **No Blank Screens**: Use skeleton views or UIActivityIndicatorView.

## References

- [Auto Layout & HIG Compliance](references/implementation.md)

## Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
- UIViewControllerRepresentable
- UIViewRepresentable

## Remediation anchors

- Remediation anchors: NSLayoutAnchor, safeAreaLayoutGuide, UIStackView