将 SwiftUI View 关闭回 UIKit ViewController

Question

在按下 SwiftUI 视图（通过 HostingViewController 呈现）上的保存按钮后，想返回到我呈现的 UIKit 视图控制器。
这就是从 UIKit VC 导航到 SwiftUI 视图的方式。

let profileView = suiProfileView().environmentObject(suiProfileViewModel())
            let profileVC = UIHostingController(rootView: profileView)
            let navVC = UINavigationController(rootViewController: profileVC)
            navVC.modalPresentationStyle = .fullScreen
            SideMenuManager.default.leftMenuNavigationController?.present(navVC, animated: true , completion: nil)

这是我的 SwiftUI 视图，我想在按下“保存”按钮后将其关闭

import SwiftUI
import Combine

struct suiProfileView: View {
    @SwiftUI.Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>
    @EnvironmentObject var profileViewModel: suiProfileViewModel
    
    @State var suiTitleText = t("general.save")
    
    var body: some View {
        GeometryReader { geo in
            VStack {
                personalInfoSection
                Spacer()
                Button("Save", action: profileViewModel.saveProfile)
                    .frame(width: geo.size.width * 0.8, height: geo.size.height * 0.08, alignment: .center)
            }
            .onReceive(profileViewModel.viewDismissalModePublisher) { shouldDismiss in
                if shouldDismiss {
                    self.presentationMode.wrappedValue.dismiss()
                }
            }
            .frame(width: geo.size.width, height: geo.size.height, alignment: .center)
            .padding()
        }
    }
}

这是我的 ProfileViewModel 类，它在运行一些业务逻辑后使用合并发布 shouldDismissView 变量。

class suiProfileViewModel: suiProfileViewModelProtocol {

    //private var model: suiProfileFormProtocol
    @Published var profile = suiProfileForm()
    
    var viewDismissalModePublisher = PassthroughSubject<Bool, Never>()
    private var shouldDismissView = false {
        didSet {
            viewDismissalModePublisher.send(shouldDismissView)
        }
    }
    
    func businessLogicThatDeterminesIfShouldDismissView() {
        //....
    }
}

由于某种原因self.presentationMode.wrappedValue.dismiss()，在我的 SwiftUI 视图中调用的函数不会关闭我的 SwiftUI 视图，并且不允许我返回到最初呈现它的初始 UIKit 视图控制器。任何帮助将不胜感激。提前致谢

Answer 1

我看到的几个问题：

1. 您试图忽略您的suiProfileView ，但实际上，它UINavigationController在您呈现之前就被包裹在 a 中了。

2. 根据我刚刚做的基本测试，即使你的suiProfileView导航控制器没有出现，presentationMode仍然不起作用——我怀疑它只有在 SwiftUI->SwiftUI 时才能准确通过，并且不能被信任可以通过UIHostingController

我建议传递一个闭包suiProfileView，可以dismiss从原始呈现视图控制器运行代码。这是一个简化的示例：

import UIKit
import SwiftUI

class ViewController: UIViewController {

    var presentedController : UINavigationController?
    
    func dismissVC() {
        presentedController?.dismiss(animated: true)
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
            let swiftUIView = ContentView(dismiss: self.dismissVC)
            let hostVC = UIHostingController(rootView: swiftUIView)
            let navVC = UINavigationController(rootViewController: hostVC)
            navVC.modalPresentationStyle = .fullScreen
            self.present(navVC, animated: true , completion: nil)
            self.presentedController = navVC
        }
        
    }
}


struct ContentView : View {
    var dismiss : () -> Void
    
    @Environment(\.presentationMode) private var presentationMode: Binding<PresentationMode>
    
    var body: some View {
        Button(action: {
            dismiss()
            //presentationMode.wrappedValue.dismiss() <-- doesn't function
        }) {
            Text("Close")
        }
    }
}