It stopped working with Xcode 9. Even with the trick to unsign the binary and update the plugins the extension doesn't work anymore. The settings of Polychromatic are showing up inside the settings menu but the code doesn't get highlighted as it should. This is most likely due to the fact that Xcode 9 reworked entirely the code editor component. It didn't seem that their extension framework was improved in Xcode 9 vs what they announced and showed in Xcode 8 so for now there is no way to get back the functionality in a more official way.
Polychromatic is awesome. Please investigate how to make it work on the new editor 😃 Would love to help but I'm clueless about the Xcode internals...
It stopped working with Xcode 9. Even with the trick to unsign the binary and update the plugins the extension doesn't work anymore. The settings of Polychromatic are showing up inside the settings menu but the code doesn't get highlighted as it should. This is most likely due to the fact that Xcode 9 reworked entirely the code editor component. It didn't seem that their extension framework was improved in Xcode 9 vs what they announced and showed in Xcode 8 so for now there is no way to get back the functionality in a more official way.