Mac OSX Overlay
问题 How would I go about programming a HUD type overlay in OSX. I want to be able to have an application that will display text at a certain point over a different application's window. And thus if the (other applications) window moves the HUD part will stay at the same coordinate of the other window. 回答1: For the window itself, use a borderless, transparent window (plenty of examples) with your own custom view into which to draw your overlaid elements. For the "other applications' windows" part,