As the topic mentioned, I want to add a overlay window onto Apps that are in full screen mode, trying to create some blur effect on the screen. But Apple seems to treat full screen mode Apps differently as a "space."
So currently I can only apply the blur effect like this.
(This is my Desktop page)
But When it doesn't affect the full screen mode Apps.
(For example: My Xcode)
And I know some of the App down this kind of stuff. Like this
This is my current code. Hope someone can tell me how to solve it.