如何从 SwiftUI 视图导航到 UIKit UIViewController

Question

到目前为止，我有一个完全使用 UIKit 构建的应用程序。但是，我希望能够开始实现一些 SwiftUI 视图来替换一些 UIViewController。

我已经能够通过点击按钮从 UIViewController 导航到 SwiftUI View：

    @IBAction func buttonTapped(_ sender: Any) {
        let newView = UIHostingController(rootView: SwiftUIView(viewObj: self.view, sb: self.storyboard, dismiss: self.dismiss) )
        view.window?.rootViewController = newView
        view.window?.makeKeyAndVisible()
    }

我的问题是，如何从单个 SwiftUI View 转换到 UIViewController？（因为应用程序的其余部分位于 UIKit 中）？我在 SwiftUI 视图中有一个按钮，点击即可导航回 UIViewController。我试过了：

1. 将

   view

   和

   storyboard

   对象传递给 SwiftUI View，然后调用执行类似于上面代码的操作来更改当前视图控制器。然而，当在模拟器上尝试时，没有任何反应。
2. 使用

   .present

   以模态方式显示 SwiftUI 视图。这有效，我可以允许 SwiftUI 视图

   .dismiss

   本身。但是，这仅在模式下有效，我希望使其正常工作（即更改屏幕）

这是我简单的 SwiftUI 视图：

struct SwiftUIView: View {
    var viewObj:UIView? // Perhaps use this for transition back?
    var sb:UIStoryboard?
    var dismiss: (() -> Void)?

    var body: some View {

        Button(action: {
            // Do something here to Transition
        }) {
            Text("This is a SwiftUI view.")
        }
    }
}

我无法理解如何将 SwiftUI 正确集成到 UIKit 中，而不是相反，我不确定 UIViewControllerRepresentable 是否是这个问题的答案。任何对此问题的解决方案、替代方案或有用的知识都非常感激。再次感谢！

Answer 1

我尝试通过使用闭包回调来遵循你的方法。

struct SwiftUIView: View {
    var dismiss: (() -> Void)?
    var present: (()->Void)?

    var body: some View {
        VStack(spacing: 20) {
            Button(action: {
                self.dismiss?()
            }) {
                Text("Dismiss me")
            }
            Button(action: {
                self.present?()
            }) {
                Text("Present some UIViewController")
            }
        }
    }
}

当您呈现 UIHostingController 时，您想要实现 2 个闭包回调：

@IBAction func buttonTapped(_ sender: Any) {
    let hostingController = UIHostingController(rootView: SwiftUIView())
    hostingController.rootView.dismiss = {
        hostingController.dismiss(animated: true, completion: nil)
    }
    hostingController.rootView.present = {
        let destination = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(identifier: "VC_TO_PRESENT")
        hostingController.present(destination, animated: true, completion: nil)
    }

    present(hostingController, animated: true, completion: nil)
}

Answer 2

struct LessonDetailsViewControllerWrapper: UIViewControllerRepresentable {
    typealias UIViewControllerType = UIViewController

    func makeUIViewController(context: UIViewControllerRepresentableContext<LessonDetailsViewControllerWrapper>) -> UIViewController {
        let viewController = LessonDetailsViewController()
        return viewController
    }

    func updateUIViewController(_ uiViewController: UIViewController, context: UIViewControllerRepresentableContext<LessonDetailsViewControllerWrapper>) {}
}

然后从 SwiftUI 视图中使用导航链接进行导航：

  NavigationLink(destination: LessonDetailsViewControllerWrapper()) {
                            LessonRow(lesson: lesson)
                        }

Answer 3

    Button(action: {
        if let vc = self.sb?.instantiateViewController(withIdentifier: "some_identifier") {
            self.viewObj?.window?.rootViewController = vc
            // or via present as alternate
            // self.viewObj?.window?.rootViewController.present(vc, animated: true, completion: nil)
        }
    }) {

Answer 4

let vc = UIHostingController(rootView: LoginView())
vc.modalPresentationStyle = .fullScreen
vc.modalTransitionStyle = .crossDissolve
self.present(vc, animated: true)

Answer 5

let controller = UIHostingController(rootView: LoginViewController())
    self.navigationController?.pushViewController(controller, animated: true)

Answer 6

LoginVCControllerRepresentable

传递。

import Foundation
import SwiftUI
struct LoginVCControllerRepresentable: UIViewControllerRepresentable {

typealias UIViewControllerType = UIViewController

func makeUIViewController(context: UIViewControllerRepresentableContext<LoginVCControllerRepresentable>) -> UIViewController {
   
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let viewController = storyboard.instantiateViewController(withIdentifier: "LogInViewController") as! LogInViewController
      return viewController
  }





func updateUIViewController(_ uiViewController: UIViewController, context: UIViewControllerRepresentableContext<LoginVCControllerRepresentable>) {}
}