macOS Create application without Dock icon, like Alfred

[Gwendolini]

Is it possible to use Xcode 6.2 to create an application that is invoked by a mouse button or keyboard shortcut with a small window around the mouse pointer (transparent and no typical OS X like window), and that that application has no Dock icon and just a small one in the Menu Bar or maybe even as a System Preference?
The application does not need to go through the App Store, it is more a personal experiment.

 

[mfram]

Just Google for "mac menubar app" and you will find all kind of hits and tutorials. I just made a quick one for another post on these forums. I can post the source if you are interested.

 

[theSeb]

Just Google for "mac menubar app" and you will find all kind of hits and tutorials. I just made a quick one for another post on these forums. I can post the source if you are interested.

I am not OP, but I am certainly interested. I have never tried this before.

 

[Red Menace]

In your application's Info.plist, add a LSUIElement key and set it to true - this will make it an agent, with no Dock icon or menu bar.