Convert UIBindable to Binding

[zachwaugh]

I'm have possibly a weird setup, but I have an AppKit view controller to render a collection view, but the rows are rendered with SwiftUI all driven by a TCA store. I'm holding on to the store as @UIBindable var store: StoreOf<Feature> in my view controller, but for the SwiftUI view, I need to provide a @Binding to a store property. Is there a way to do that I missed?

[maximkrouk]

Have you tried smth like this?

class ParentVC: NSViewController {
  @UIBindable
  var store: StoreOf<Feature>
  
  func someSetupFuncForSUIView() {
    // pass store directly to content view
    someHostingController.rootView = FeatureContainerView(store)
  }
}

// If it's your VC's entire content view, I'd probably put it inside of `ParentVC` class and remove `Container` from naming
struct FeatureContainerView: View {
  // use state in content view to get bindings from the store rather then @UIBinding
  @SwiftUI.State
  private var store: StoreOf<Feature>
  
  init(_ store: StoreOf<Feature>) {
    self.store = store
  }
  
  var body: some View {
    // here is your binding for `property`
    SomeBindableView($store.property.sending(/*send custom action if needed*/))
  }
}

This approach should probably work with any Observable object, not only TCA store

[zachwaugh]

Thanks! That would work too (though I think you'd want to use @Bindable var store: StoreOf<Feature> there over @State), but I didn't want to pass in the entire store to the view, so I think @mbrandonw's method is a little simpler for this case.

[mbrandonw]

You can also always create a local @Bindable store for deriving Bindings from:

class VC: UIViewController {
  @UIBindable var store: StoreOf<Feature>

  func buttonTapped() {
    @Bindable var store = store
    $store.property // Binding<…>
  }
}

That's pretty similar to what one does in SwiftUI when you have an @Environment model and you do @Bindable var model in the view to then get bindings from it.

[zachwaugh]

Thanks @mbrandonw! For some reason I never think of using property wrappers for local vars.