View extension to mirror focus state between a view and view model

sync.swift

extension View {
    /// Mirror changes between an @Published variable (typically in your View Model) and an @FocusedState variable in a view
    func sync<T: Equatable>(_ field1: Binding<T>, _ field2: FocusState<T>.Binding ) -> some View {
        self
           .onChange(of: field1.wrappedValue) { field2.wrappedValue = $0 }
           .onChange(of: field2.wrappedValue) { field1.wrappedValue = $0 }
    }
}