Animate nsmenuitem

I would lik开发者_JAVA技巧e to animate nsmenuitem that I have for my app (preferably use coreanimation). I have seen the menu item animating in CloudApp, dropbox, Time Machine and Syncing MobileMe.

NSMenuItem can have a custom view. In that case, is your responsibility drawing the item. A custom view can be easily animated (adding a progress indicator or whatever you need).

Check NSMenuItem reference: -[NSMenuItem view], -[NSMenuItem setView] and its associated code samples.