I am an iOS developer and did my first Cocoa Mac application using Xcode 4.2, I set the Logo image in the xcode itself and property list, but the application logo still has its default logo (the white sheet with two pens), how can I set Logo for my application?
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Design your 512×512 icon and save it as png file. Open Icon Composer (installed with Xcode in /Developer/Applications/Utilities folder) and drag your png file to it and save your icon as icns.
Now in Xcode open your project and select the target. Drag your icns file to the “App Icon” box. That´s it! Build and run again…