Which Design Pattern should be used in watch app swift?

I have searched a lot through internet read so many Article but couldn't find even a single answer to my question, that exactly which design pattern[MVC, MVP, MVVM, VIPER] should I use in my watch OS app.

I have a fitness app which tracks the running and show the calories, pace distance and the path followed while running for both iPhone and Apple watch. My iPhone app is well managed as I have used the MVVM but I didn't have any idea how to make my code more modular in case of watch. As my WKInterfaceController Class are extensively heavy and It is really painful to code in unstructured way.

Please help me understand how can I make my code more standard and structured.

Thanks in Advance