compiler "has no member" error with MVVM design pattern Swift - swift

Question

Im trying to write boiler plate code for an MVVM architecture and I'm trying to make the View interface inside my ViewModel instead of binding properties between them.
I do get a compiler error saying Type 'V.Command' has no member 'reload' How can I improve my code so that View is abstracted inside my ViewModel?
Interfaces
protocol Actionable {
associatedtype Command
func perform(command: Command)
}
extension Actionable {
func perform(command: Command) {}
}
protocol Rendering {
associatedtype Model
func render(with model: Model)
}
extension Rendering {
func render(with dependencies: Model) {}
}
protocol VMView: Rendering, Actionable {}
protocol ViewModel {
associatedtype Command
associatedtype Dependencies
associatedtype Model
}
View Implementation
final class NewViewVC: UIViewController, VMView {
typealias Model = NewViewVM<NewViewVC>.Model
typealias Command = NewViewVM<NewViewVC>.Command
func perform(command: Command) {
print("performing \(command)")
}
func render(with model: Model) {
print("rendering \(model)")
}
var viewModel: NewViewVM<NewViewVC>!
override func viewDidLoad() {
super.viewDidLoad()
}
}
extension NewViewVC {
static func create(dependencies: NewViewVM<NewViewVC>.Dependencies) -> NewViewVC {
let vc = NewViewVC()
let viewModel = NewViewVM.create(dependencies: dependencies, services: .init(), view: vc)
vc.viewModel = viewModel
return vc
}
static func createMock(dependencies: NewViewVM<NewViewVC>.Dependencies, services: NewViewVM<NewViewVC>.Dependencies.Services) -> NewViewVC {
let vc = NewViewVC()
let viewModel = NewViewVM.create(dependencies: dependencies, services: services, view: vc)
vc.viewModel = viewModel
return vc
}
}
ViewModel Implementation
protocol NewViewVMInterface {
func reloadData()
}
final class NewViewVM<V: VMView>: ViewModel, NewViewVMInterface {
struct Model {}
enum Command {
case start, reload
}
struct Dependencies {
struct Services {
}
}
private var view: V!
private var dependencies: Dependencies!
private var services: Dependencies.Services!
static func create(dependencies: Dependencies, services: Dependencies.Services, view: V) -> NewViewVM
where V.Model == Model, V.Command == Command {
let viewModel = NewViewVM()
viewModel.dependencies = dependencies
viewModel.services = services
viewModel.view = view
return viewModel
}
func reloadData() {
// fetch data
view.perform(command: .reload) // <- Where error happens
}
}
Thanks for any help. A quick fix I can find is to force cast the command to V.Command but that's very ugly. I feel there is a better solution.

Answer 1

Looks like if I put the NewViewVMInterface conformance to an extension I'll be able to do something like this:
extension NewViewVM: NewViewVMInterface where V.Command == Command, V.Model == Model {
func reloadData() {
view.perform(command: .reload)
}
}
However in my past experiences I've noticed sometime when making SDKs having protocol conformances in extensions results in unexpected behaviours. Im still open to any other suggestions out there.