SKScene with bindings in a SpriteView

Question

I've created a SpriteKit Scene file and the corresponding SKScene object. That scene object includes an @Binding property.

When I use SpriteView in my SwiftUI file, I can't figure out how to initialize the scene so that it loads from the sks file and also assigns a binding.

I'm wanting something like this:

class MyScene: SKScene {
    @Binding var foo: CGFloat

    init(foo: Binding<CGFloat>) {
      _foo = foo
      super.init(fileNamed: "MyScene")
    }
}

That doesn't work though because init(fileNamed:) is a convenience initializer, not a designated initializer.

Answer 1

A possible workaround using ObservableObject to subscribe to foo. I pass a fileName so I have an excuse to invoke my convenience initializer.

class MyScene: SKScene, ObservableObject {
    @Published var foo: CGFloat = 0

    convenience init(fileName: String) {
      self.init(fileNamed: fileName)!
    }
}

And then hold a reference to it on your view (or elsewhere).

struct MyView: View {

    @ObservedObject var scene = MyScene(fileName: "MyScene")

    var body: some View {
        VStack {
            FooView($scene.foo)
            SpriteView(scene: scene)
        }
    }
}