Refactor the app from storyboard to SwiftUI alone. The APP is used with a smartphone, which can make users know their physical condition, like Heart Rate , Daily Steps, Sleep Status, and record the sports details to provide a better control of your health. Implemet: I use SwiftUI within MVVM to build the View, and combine the data in with a viewmodel like notification or data source from backend. I also need to use BLE 4.2 to exchange the raw data from the phone to the watch and then store the data in CoreData . To