How can I make the whole window semi transparent?

How can I make the whole window semi transparent? Like Finder's side bar or iTunes' sidebar in Mojave. I'm using macOS Mojave and Xcode 10. I'm new to macOS Development. Any help would be great!

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nickfromchatham
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Oh, I'm using Objective-C. I'm an old school Mac Developer.

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nickfromchatham
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Set the alpha value for the window. But first make it non opaque.


Read complete discussion here (it is Swift but very easy to write in ObjC)


https://stackoverflow.com/questions/34531118/how-can-i-create-a-window-with-transparent-background-with-swift-on-osx

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Claude31
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Use an NSVisualEffectView as your content view.

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Ken Thomases
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