SwiftUI +合并框架+ MVVM Publisher返回空列表

问题描述

我正在 Swift-UI 中将 MVVM架构与 Combine Framework 和 Alamofire 一起使用。 但是，数据将返回到可观察对象，并且正在打印，这意味着Alamofire和来自api层的已发布数据，但从可观察对象将无法查看。 我在发布者中打印响应及其打印，但不返回查看。

以下是可观察对象。

import SwiftUI
import Combine

class Countryviewmodel: ObservableObject {
    
    @Published var countryResponse:[CountryResponse] = []
    
    @Published var isLoggedIn = false
    @Published var isLoading = false
    
    @Published var shouldNavigate = false
    
    private var disposables: Set<AnyCancellable> = []
    
    var loginHandler = CountryHandler()
    
    @Published var woofUrl = ""
    
    private var isLoadingPublisher: AnyPublisher<Bool,Never> {
        loginHandler.$isLoading
            .receive(on: RunLoop.main)
            .map { $0 }
            .erasetoAnyPublisher()
    }
    
    private var isAuthenticatedPublisher: AnyPublisher<[CountryResponse],Never> {
        loginHandler.$countryResponse
            .receive(on: RunLoop.main)
            .map { response in
                guard let response = response else {
                    return []
                }
                print(response)
                return response
            }
        .erasetoAnyPublisher()
    }
    
    init() {
        countryResponse = []
        isLoadingPublisher
            .receive(on: RunLoop.main)
            .assign(to: \.isLoading,on: self)
            .store(in: &disposables)
        
        isAuthenticatedPublisher.map([CountryResponse].init)
            .receive(on: dispatchQueue.main)
            .sink(receiveCompletion: { [weak self] value in
              guard let self = self else { return }
              switch value {
              case .failure:
                self.countryResponse = []
              case .finished:
                break
              }
              },receiveValue: { [weak self] weather in
                guard let self = self else { return }
                self.countryResponse = weather
            })
            .store(in: &disposables)
           //        isAuthenticatedPublisher
          //            .receive(on: RunLoop.main)
         //            .assign(to: \.countryResponse,on: self)
        //            .store(in: &disposables)
    }
        
    public func getAllCountries(){
        loginHandler.getCountryList()
    }
    
    public func getAllUnis(_ id:Int){
        loginHandler.getCountryList()
    }
}

查看代码

struct ContentViewCollection: View {
    
    @Binding var selectedCountryId:Int
    var axis : Axis.Set = .horizontal
    var viewmodel:Countryviewmodel
    @State var countries:[CountryResponse] = []
    
    var body: some View {
        ScrollView (.horizontal,showsIndicators: false) {
            HStack {
                ForEach(self.viewmodel.countryResponse) { (postData) in
                    Button(action: {
                        self.selectedCountryId = postData.countryID ?? 0
                    }){
                        WebImage(url: self.imageURL(postData.countryName ?? ""))
                            .resizable()
                            .indicator(.activity)
                            .scaledToFit()
                            .frame(minWidth: 40,maxWidth: 40,minHeight: 40,maxHeight: 40,alignment: .center)
                    }
                    
                }
            }
        }.onAppear() {
            self.loadData()
        }
    }
}

谢谢。

解决方法

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