Drawing a transparent NSView in NSWindow with black background

Question

I have a NSView inside a NSWindow and the background of NSWindow is set to black (with alpha of 0.7). Is there anyway to have the NSView showing what's underneath the NSWindow ? In other words, how do I make the part where NSWindow and NSView overlap to have clear background?

Thanks!

Answer 1

您可以尝试setOpaque方法

Answer 2

If I understand properly, it seems like you're trying to have a window with hole in it. You can take a look at apple's sample code Round Transparent Window . It shows how to add transparent areas to an NSWindow.