Xcode Preview Capture

Xcode Preview Capture (Codex)

Use this skill to build SwiftUI previews and inspect screenshots.

Prerequisites

• Xcode + iOS Simulator installed
• Swift toolchain (preview-tool auto-builds on first run)
• PREVIEW_BUILD_PATH set to this repository root
  • Example: export PREVIEW_BUILD_PATH=/absolute/path/to/XcodePreviews

Primary Command

Use the unified entry point first:

"${PREVIEW_BUILD_PATH}"/scripts/preview \
  "<path-to-file.swift>" \
  --output /tmp/preview.png

The script auto-detects:

• Xcode project with #Preview -> dynamic target injection
• Swift Package -> SPM preview workflow
• Standalone Swift file -> minimal host build

Capture Current Simulator

"${PREVIEW_BUILD_PATH}"/scripts/preview \
  --capture \
  --output /tmp/preview.png

Workflow

1. Run scripts/preview with the requested file or --capture.
2. Confirm the output path exists.
3. Open /tmp/preview*.png and analyze the rendered UI.
4. Report structure, styling, and visible issues (alignment, clipping, contrast, etc.).

Troubleshooting

• No simulator booted: run sim-manager.sh boot "iPhone 17 Pro".
• Build failure: surface the error and suggest targeted fixes.
• Wrong project detected: pass --project or --workspace explicitly.

Source: Iron-Ham/XcodePreviews — distributed by TomeVault.