macOS Tahoe introduces a new theming system allowing users to customize their desktop environment with various options.
The update includes a new "Icon & widget style" section with different modes like Dark and Clear, offering transparency and new design elements.
Developers can now craft app icons using Icon Composer in Xcode, defining various appearances and effects for different platforms.
Icon Composer enables the creation of app icons with real-time glass properties and other effects to suit different appearance modes.
The system renders app icons for different platforms and appearances from a single Icon Composer file, simplifying icon management.
macOS 26 Tahoe features squircle app icons similar to iOS and supports custom-shaped icons in the Dock.
Users can manually assign app icons through Finder on macOS, respecting the chosen shape and appearance settings.
Developers can still display custom-shaped icons in the Dock by setting a view on NSApplication.shared.dockTile.contentView.
Some users are adapting Dock icons to customize their appearance settings, but questions remain about handling different theme combinations programmatically.