从SwiftUI视图中选择到UIViewController

问题描述

我正在努力在我现有的应用程序中实现一些SwiftUI内容.我目前有一个UIViewController，该UIViewController托管一个MTKView来进行相机预览.

I am working to implement some SwiftUI content into my existing app. I currently have a UIViewController, which hosts a MTKView for camera preview.

我已经创建了一个新的SwiftUI视图，该视图现在是我的 root 视图，与我的SceneDelegate.swift文件中的设置相同.如预期的那样，SwiftUI视图将在启动时加载.现在，我想创建一个segue，当用户点击列表中的一行时，它将全屏显示到我现有的UIViewController中.这就是我的称呼方式；

I have created a new SwiftUI view, which is now my root view, as set in my SceneDelegate.swift file. The SwiftUI view loads at launch, as expected. Now, I would like to create a segue in which, when a user taps on a row in my List, it will segue, full-screen to my existing UIViewController. Here is how I'm calling that;

var body: some View {
    VStack {
        NavigationView {
            List(sessionTypes) { session in
                NavigationLink(destination: CameraControllerWrapper()) {
                    SessionRow(session: session)
                    .frame(height: 40.0)
                }
            }
        .navigationBarTitle(Text("Camera Types"))
        }
    }
}

为后代，这是我的CameraControllerWrapper UIViewControllerRepresentable;

For posterity, here is my CameraControllerWrapper UIViewControllerRepresentable;

struct CameraControllerWrapper: UIViewControllerRepresentable {
typealias UIViewControllerType = CameraController

   func makeUIViewController(context: UIViewControllerRepresentableContext<CameraControllerWrapper>) -> CameraControllerWrapper.UIViewControllerType {
    return CameraController()
   }

   func updateUIViewController(_ uiViewController: CameraControllerWrapper.UIViewControllerType, context: UIViewControllerRepresentableContext<CameraControllerWrapper>) {
    //
   }
}

尽管这可行"，但我的应用程序在调用CameraController时立即崩溃，因为似乎找不到我的任何IBOutlets. CameraController是内置在情节提要中的UIViewController.

While this "works," my app crashes as soon as the CameraController is called, as it seems any of my IBOutlets cannot be found. CameraController is a UIViewController built in the storyboard.

推荐答案

我设法解决了这一问题，因为我意识到需要从Storyboard而不是代码中实例化UIViewController(因为我已经在Storyboard中构建了它的布局，一些程序化元素).要使用上面的NavigationLink，我需要这样调整UIViewControllerRepresentable；

I managed to resolve this by realizing that I needed to instantiate the UIViewController from the Storyboard, and not in code (as I had built its layout in Storyboard, alongside some programatic elements). To use the above NavigationLink, I needed to adjust my UIViewControllerRepresentable as such;

struct CameraControllerWrapper: UIViewControllerRepresentable {
    typealias UIViewControllerType = CameraController

    func makeUIViewController(context: UIViewControllerRepresentableContext<CameraControllerWrapper>) -> CameraControllerWrapper.UIViewControllerType {

    let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let mainViewController: CameraController = mainStoryboard.instantiateViewController(withIdentifier: "CameraController") as! CameraController
      return mainViewController

    }

    func updateUIViewController(_ uiViewController: CameraControllerWrapper.UIViewControllerType, context: UIViewControllerRepresentableContext<CameraControllerWrapper>) {
        //
    }
}

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