This is a screensaver which was created out of a very basic need. I just wanted a screensaver which would make the screen black on my Macbook. It's not an option which comes included with macOS, and other existing solutions such as macos-blank-screensaver stopped working with macOS Mojave (10.14).
Without any prior experience with XCode or Objective-C, I set out to create my own screensaver by following a random guide I found online, and managed to do so!
macOS Mojave (10.14) as that's what I'm running on my machine. I have no idea if it might work on other machines and if it will continue working in the future.
Not that there's much to see...
I have added zip files with the resulting screensaver to the
releases page. If you
download one and double click the zip file, you should get at Black.saver.
Double click that and it will be installed and will then be visible in the list
of screensavers on your system.
Depending on if the screensaver was installed for only your user or all users
of the system, it will have been placed in either ~/Library/Screen Savers or
/Library/Screen Savers. Removing the Black.saver folder will remove the
screensaver from your machine.