macOS Wondering: Why doesn't Apple release the API to properly implement menubar items?

The "proper" menu items run in SystemUIServer rather than in the applications that provide them, which is a bit of a risky thing to do. Some sort of in-between solution (perhaps something like how DockTile plugins work) seems appropriate. Have you filed a request with Apple for this at bugreport.apple.com?

ravenvii said:

When you click an item of Apple's, and move your mouse to another Apple item, the menu activates normally, but when you mouse over a third party's icon, it doesn't activate. You have to click to deactivate the menu, and click again the activate the third party menu.

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I've never noticed that. Now I'm gonna get annoyed by it However, iStatMenus doesn't behave like this, it activates like a menu item should, but others like Bowtie and Adium don't, like you said.

I am wondering why Apple refuses to reveal the proper APIs for third parties to use for menubar items?

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Chances are Apple wants to keep things clean and uncluttered.

It's been like this since the beginning (AFAIK). I guess there isn't enough demand from developers for Apple to change it. Like Catfish_Man mentioned they probably will never open the existing API because each menu is a plugin managed by SystemUIServer and if one of those plugins crash, down goes the entire SystemUIServer process and all those menu items are gone (until it relaunches). I've seen it happen several times with Spotlight being the culprit.

There's no reason they can't come up with some solution for integrating Apple menus with third-parties smoothly. I think they're just lazy

MenuMeters seems to function "correctly" (it'll drop down its menus after clicking on an Apple menu and moving to MM).

HiRez said:

MenuMeters seems to function "correctly" (it'll drop down its menus after clicking on an Apple menu and moving to MM).

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Looks like they use MenuCracker though.