UIViewControllerRepresentable中与Storyboard的绑定

Question

我有一个UIViewControllerRepresentable和一个UIStoryboard。如何将@对象传递给ViewController？它目前还没有初始化，我无法将它传递给"as！ARView(模型:模型)“。

struct ARViewContainer: UIViewControllerRepresentable {
    
    @ObservedObject var model: Model
    
    typealias UIViewControllerType = ARView
    
    func makeUIViewController(context: Context) -> ARView {
        UIStoryboard(name: "Main", bundle: Bundle.main).instantiateViewController(identifier: "Main") as! ARView
    }
    func updateUIViewController(_ uiViewController: ARViewContainer.UIViewControllerType, context: UIViewControllerRepresentableContext<ARViewContainer>) { }
    
}

class ARView: UIViewController, ARSCNViewDelegate {
    
    // MARK: Object model
    
    @ObservedObject var model: Model
    
    // MARK: - Initalisation
    
    init(model: Model) {
        self.model = model
        super.init(nibName: nil, bundle: nil)
    }
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

Answer 1

没有理由在@ObservableObject中使用UIViewController。属性包装器不会像在View中那样对您有任何好处，从而触发更新。

@ObservableObject不能是Optional，但是由于它不再需要使用属性包装器，所以可以将它变成Optional。显然，当需要使用它时，您将不得不展开它。

struct ARViewContainer: UIViewControllerRepresentable {
    
    @ObservedObject var model: Model
    
    typealias UIViewControllerType = ARView
    
    func makeUIViewController(context: Context) -> ARView {
        let vc = UIStoryboard(name: "Main", bundle: Bundle.main).instantiateViewController(identifier: "Main") as! ARView
        vc.model = model
        return vc
    }
    func updateUIViewController(_ uiViewController: ARViewContainer.UIViewControllerType, context: UIViewControllerRepresentableContext<ARViewContainer>) {
    }
        
}

class ARView: UIViewController, ARSCNViewDelegate {
    var model: Model?
}