Electron打包Mac DMG时自定义图标不生效问题求助

Hey, I’ve run into this exact problem before! You’re already on the right track with your command, but there are a few easy-to-miss details that might be causing the default icon to stick around. Let’s break down the possible fixes step by step:

1. Verify Your ICNS File Meets Requirements #

Mac’s volume icon expects the .icns file to include multiple sizes (16x16, 32x32, 64x64, 128x128, 256x256, 512x512, 1024x1024). If your favicon.icns only has a single small size, the system might ignore it and fall back to the default.

You can check this using Apple’s Icon Composer (part of Xcode’s developer tools) or a third-party tool to confirm all required sizes are present. If it’s incomplete, regenerate the .icns file with a full set of sizes.

2. Double-Check Relative Path & Tool Version #

• Relative Path Pitfall: Make sure you’re running the electron-installer-dmg command from the correct working directory. If your images/favicon.icns path is relative, but you’re executing the command from a subfolder (like release-builds), the tool won’t find the icon. Try using an absolute path instead, e.g.:

  electron-installer-dmg ./release-builds/automental-darwin-x64/automental.app Automental --out=release-builds --overwrite --icon=/full/path/to/images/favicon.icns
  

• Outdated Tool: Old versions of electron-installer-dmg had bugs related to volume icon handling. Update to the latest version first:

  npm install -g electron-installer-dmg@latest
  

3. Clear Mac’s Icon Cache #

Mac’s Finder caches icons aggressively, even if the .VolumeIcon.icns file is correctly placed. To force it to refresh:

1. Run these commands in Terminal:

   killall Finder
   rm -rf ~/Library/Caches/com.apple.finder/Cache.db
   

2. Restart Finder (it should relaunch automatically after the first command) and re-open your DMG.

4. Verify .VolumeIcon.icns Placement #

Mount your generated DMG, then open Terminal and run:

ls -la /Volumes/Automental

Look for the hidden .VolumeIcon.icns file. If it’s missing, the tool failed to copy it over (likely a path issue). If it exists but is empty, your source icon file might be corrupted.

5. Manual Fix as a Last Resort #

If the tool still isn’t working, manually set the volume icon:

1. Mount the DMG and copy your favicon.icns to the root of the volume, renaming it to .VolumeIcon.icns (the leading dot hides it).
2. Install Xcode’s command line tools if you haven’t already:

   xcode-select --install
   

3. Run this command to mark the icon as the volume’s default (replace /Volumes/Automental with your DMG’s mount path):

   SetFile -a C /Volumes/Automental
   

4. Eject the DMG and re-open it—your custom icon should now show up.

内容的提问来源于stack exchange，提问作者AragornD7