从SWIFTUI调用UIKit函数

问题描述

我有一个情节提要UIKit函数getAcctBalance()。在我的UIKit文件中，我显示了一个UIHostingController来加载SWIFTUI视图。在SWIFTUI视图中，我想调用我的函数getAcctBalance()。

SWIFTUI：

import SwiftUI
import SWXMLHash

struct UserDashboard: View {
    
    @ObservedObject var userModel: UserDashboardModel

    Button(action: {
       UserDashboardHostVC.getAcctBalance() //This function call is not working
    }){
       Text("Load Balance")
    }

    Text(userModel.totalBalance) //by default it is 0.0 and when button is pressed it should return 599
}

UIKit：

import UIKit

class UserDashboardModel: ObservableObject {
    @Published var totalBalance     = 0.0
}

class UserDashboardHostVC: UIViewController {
    
    var userModel = UserDashboardModel()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        let controller = UIHostingController(rootView: UserDashboard(userModel: self.userModel))
        controller.view.translatesAutoresizingMaskIntoConstraints = false
        self.addChild(controller)
        self.view.addSubview(controller.view)
        controller.didMove(toParent: self)

    }
    func getAcctBalance {
        userModel.totalBalance = 599
}

推荐答案

这里有一个示例

class UserDashboardModel: ObservableObject {
    @Published var totalBalance     = 0.0
    internal var uIViewController: UserDashboardHostVC? = nil
    
    func getAcctBalance(){
        if uIViewController != nil{
            uIViewController!.getAcctBalance()
        }else{
            print("view controller is not connected")
        }
    }
}
struct UserDashboard: View {
    
    @ObservedObject var userModel: UserDashboardModel
    var body: some View{
        VStack{
            Button(action: {
                userModel.getAcctBalance() //Call shared model
            }){
                Text("Load Balance")
            }
            
            Text(userModel.totalBalance.description) //Now it will change
        }.frame(width: 400, height: 400, alignment: .center)
    }
}
class UserDashboardHostVC: UIViewController {
    
    var userModel = UserDashboardModel()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        //Crucial connection
        userModel.uIViewController = self
        let controller = UIHostingController(rootView: UserDashboard(userModel: self.userModel))
        
        self.addChild(controller)
        self.view.addSubview(controller.view)
        controller.view.translatesAutoresizingMaskIntoConstraints = false
        //Update constraints per use case
        controller.view.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        controller.view.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        controller.didMove(toParent: self)
        
    }
    func getAcctBalance() {
        userModel.totalBalance = 599
    }
}