UIViewControllerRepresentable 与 Storyboard 的绑定

Question

我有一个可以用 UIStoryboard 表示的 UIViewController。如何将我的@ObservedObject 传递给 ViewController？目前尚未初始化，我无法将其传递给“as！ARView（model：model）”

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 UIViewController 中使用 @ObservableObject。属性包装器不像在 View 中那样对您有任何好处，触发更新。

@ObservableObject 不能是 Optional，但由于它不再需要属性包装器，您可以使其成为 Optional。很明显，需要用到的时候就得拆开。

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?
}

UIViewControllerRepresentable 与 Storyboard 的绑定

Bindings in UIViewControllerRepresentable with Storyboard

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