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iOS/macOS App Developer

A field-tested guide for building iOS/macOS apps with XcodeGen, SwiftUI and SPM, plus Apple code signing, notarization and CI/CD fixes.

Dev & CodingAdvanced★ 1,323⑂ 212AI score 9/10Last updated: Aug 8, 2026

What it does

  • Gives a minimal XcodeGen project.yml template and shows why signing must live in target settings, not globally.
  • Diagnoses the Library not loaded: @rpath/... launch crash caused by SPM dynamic frameworks that XcodeGen never embeds, with a one-time Xcode GUI fix.
  • Maps iOS 17-only APIs to iOS 16-compatible replacements (.onChange, ContentUnavailableView, AVAudioApplication, @Observable).
  • Quick-reference commands for generating projects, building for simulator/device, clearing DerivedData and listing devices.
  • A 5-step macOS signing + notarization checklist (native and Electron), the exact 5 GitHub Secrets needed, and real CI pitfalls: silent adhoc fallback, EMFILE during signing, teamId credential conflict.

Who it's for

  • iOS/macOS engineers who manage Xcode projects declaratively with XcodeGen.
  • Developers blocked by free Apple ID vs paid account limitations.
  • Teams wiring up Developer ID signing and notarytool in GitHub Actions.
  • Electron developers shipping macOS builds outside the App Store.

Examples

  1. "App runs in the simulator but crashes instantly on device with an @rpath error" → guided to switch the framework to Embed & Sign and build once from the Xcode GUI.
  2. "CI says signing succeeded but the release is adhoc-signed" → adds continueOnError: false plus a codesign --verify --deep --strict postPackage check.
  3. "Notarization fails with 'Cannot use password credentials, API key credentials...'" → drop teamId from @electron/notarize since notarytool infers the team.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/daymade/claude-code-skills/HEAD/iOS-APP-developer/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on AI Skill Mart.
Copy the iOS-APP-developer folder from the GitHub repo daymade/claude-code-skills into my ~/.claude/skills/developing-ios-apps/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/daymade/claude-code-skills.git && mkdir -p ~/.claude/skills && cp -r claude-code-skills/iOS-APP-developer ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal and clone the repo: git clone https://github.com/daymade/claude-code-skills.git
  2. Create the skills folder if needed: mkdir -p ~/.claude/skills
  3. Copy just this skill: cp -r claude-code-skills/iOS-APP-developer ~/.claude/skills/
  4. Verify with ls ~/.claude/skills/iOS-APP-developer — you should see SKILL.md and a references/ directory.
  5. Restart Claude Code, then ask something like "my XcodeGen build fails with an @rpath error" to trigger the skill.
  6. Prerequisites: macOS with Xcode (and brew install xcodegen); command-line builds and CI signing require a paid Apple Developer account.
View source on GitHub ↗License: MIT