SwiftUI is definitely the way forward for development on all Apple platforms, and I am excited about it. That said, it is only going to be supported on new OS releases going forward. My plan is to support the current version of iOS and macOS going forward for at least a year, which will make it challenging for me to switch my UI code to SwiftUI at that time. Next fall, however, when Apple’s OS cycle turns over again, would be a great time for me to finish up SwiftUI-based rewrites and push them to production. I have a lot of prep work I can do in the meantime.