macOS Mojave: Change app icon to match Dark/Light Mode

Question

Is there a way to change my app icon dynamically when switching between Dark/Light Mode in macOS Mojave?

I wish to change the icon appearance to appear appropriately in system alerts and notifications.

Youngran

The answer here: #52769374 may be of some use to you. The answer provided this link which has a lot of information on setting icons for different modes: developer.apple.com/documentation/appkit/images_and_pdf/… – Jellicoe

Answer 1

It seems like your best bet is to handle the icon change yourself: listen to appearance change notifications, and update the icon accordingly.

To set the Dock icon:

• The easiest way is to assign a NSImage to NSApp.applicationIconImage. However, this only works when the app is running, and the change is cleared when the app quits.
• A more reliable way, that keeps working when the app is not running, is to use a dock tile plugin. The implementation is more involved, however, as you need to create and configure an additional target.

Balaklava