App icon The icon is an Icon Composer file in git: , a folder with and SVG layers in . You write both by hand. macOS adds the glass, the highlights, the shadow, the mask, and the dark, tinted, and clear looks. You never draw those yourself. - compiles it with into and . runs it when the icon changed. - renders it with (Icon Composer's command line tool, inside Xcode) into one contact sheet you read. Older app without these files: copy , , , and from the template, the icon block of its , and = from its . Other cases: more-cases.md. - An Xcode or XcodeGen project (Xcode compiles the itself). -…