Three operating modes of macOS application

Normal,You won't encounter this problem,Until you need to write a background program...

We all know that macOS has a global Dock,All running programs will be displayed on this thing,But if your program is a menu bar applet,Or a...input method,Then you definitely don’t want the icon of this app to be displayed on the Dock,Because this kind of app needs to run continuously in the background。[……]

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