Silencing Unknown class 'SPUStandardUpdaterController' warnings

[massimobio]

My Mac app has two targets. One for the Mac App Store and one for direct distribution which uses the Sparkle library.
I don't include Sparkle in the MAS target so I always see this warning in Xcode:

and this warning in the console when running the app:

Unknown class 'SPUStandardUpdaterController', using 'NSObject' instead. Encountered in Interface Builder file at path '.../MainMenu.nib'.
Could not connect action. Target class 'NSObject' does not respond to '-checkForUpdates:'.

I attempted to silence this warning by creating a placeholder class for the MAS target:

class SPUStandardUpdaterController: NSObject {
    @IBAction func check(forUpdates sender: Any) {}
}

but it didn't work.

Short of having separate MainMenu.xib files for each target (not great for maintainability), is there some other way to silence these warnings?

[zorgiepoo]

Probably best to instantiate the controller programmatically then instead of in the main nib. See https://sparkle-project.org/documentation/programmatic-setup/ it should only be a few lines of code.