Asset Catalog Optimizer

Asset Catalog Optimizer

Analyze .xcassets folders to optimize image assets and find issues.

Capabilities

• List all assets in catalogs
• Find unused images (not referenced in code)
• Check for missing @2x/​@3x versions
• Analyze image file sizes
• Compress images losslessly
• Detect duplicate images
• Validate asset naming
• Generate asset inventory
• Calculate total asset size
• Suggest optimizations

Tools Included

asset_optimizer.py

Python script for asset analysis and optimization

Commands:

# Analyze asset catalog
./​asset_optimizer.py PaleoRose/​Assets.xcassets analyze

# Find unused assets
./​asset_optimizer.py PaleoRose/​Assets.xcassets find-unused --source-dir PaleoRose

# Check missing resolutions
./​asset_optimizer.py PaleoRose/​Assets.xcassets check-resolutions

# Compress images
./​asset_optimizer.py PaleoRose/​Assets.xcassets compress --quality 85

# Generate report
./​asset_optimizer.py PaleoRose/​Assets.xcassets report --output report.html

# Calculate sizes
./​asset_optimizer.py PaleoRose/​Assets.xcassets sizes

Features

Unused Asset Detection

Searches Swift/​ObjC code for asset references like:

• NSImage(named: "icon")
• UIImage(named: "logo")
• Image("background")
• [NSImage imageNamed:@"button"]

Resolution Checking

Verifies all imagesets have:

• @1x (universal or Mac)
• @2x (required for Retina)
• @3x (iOS only, warns if missing)

Compression

• PNG: lossless optimization with pngquant/​optipng
• JPEG: quality-based compression
• Preserves transparency
• Maintains color profiles

Usage

Run when:

• App bundle is too large
• Need to audit assets
• Before App Store submission
• Cleaning up old/​unused assets
• Optimizing performance

Output Examples

Asset Catalog Analysis: Assets.xcassets
========================================

Total Assets: 47
Total Size: 12.3 MB

Missing Resolutions (5):
  - icon.imageset: Missing @2x
  - logo.imageset: Missing @3x
  - background.imageset: Missing @2x, @3x

Unused Assets (8):
  - old-button.imageset (45 KB)
  - deprecated-icon.imageset (23 KB)
  - test-image.imageset (156 KB)

Potential Savings:
  - Compression: 3.2 MB (26%)
  - Remove unused: 1.8 MB (15%)
  - Total: 5.0 MB (41%)

Recommendations:
  1. Compress 23 PNG files to save 3.2 MB
  2. Remove 8 unused assets to save 1.8 MB
  3. Add missing @2x/​@3x versions for 5 assets