BCStatusItem 介绍
BCStatusItem 是 NSStatusItem 的扩展
A view and NSStatusItem category to let you easily expand the functionality of
NSStatusItem. One issue with NSStatusItem is getting it’s location/frame on
the screen. You can do this if it has a custom view, so one of the features of
BCStatusItem is to by default have a custom view that behaves like
NSStatusItem does by default.
