Unable to display Alert from an Observable Object - swiftui

Question

Scenario:
I want to be able to display an Alert() from an Observable Object, via #Published values (networkMessage & hasAlert).
This alert should be fired when missing a network connection.
via
Host View that displays the Alert() :
import SwiftUI
struct EndPointView: View {
#EnvironmentObject var settings: Settings
#ObservedObject var standardWeatherReport = StandardWeatherReport()
#ObservedObject var publishedWeatherReport = PublishedWeatherReport()
#ObservedObject var pepBoy = PepBoy()
#ObservedObject var postMan = PostMan()
var body: some View {
Form {
Text("Chosen One: \(settings.endpointSection)")
Text("Row Two")
Text("Row Three")
Text("Row Four")
}.onAppear {
self.acquireData()
}
.alert(isPresented: $standardWeatherReport.hasAlert, content: { () -> Alert in
Alert(title: Text(verbatim: standardWeatherReport.networkMessage!))
})
}
func acquireData() {
let chosenEndPoint = EndPoints(rawValue: settings.endpointSection)
switch chosenEndPoint {
case .standardWeather:
standardWeatherReport.doStandard()
case .publishedWeather:
publishedWeatherReport.doPublish()
case .postman:
postMan.doPublishPostMan()
case .publishpepboy:
pepBoy.doPublishPep()
case .none:
print("none")
}
}
}
Observable Object the initially fired off the Alert() via case .failure(let anError):
import Foundation
class PublishedWeatherReport: ObservableObject {
#Published var networkMessage: String?
#Published var hasAlert = false
#Published var weatherReport: String?
func doPublish() {
let url = EndPoint.weather.path()
var request = URLRequest(url: EndPoint.weather.path()!)
request.httpMethod = "GET"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
// Publisher:
let remoteDataPublisher = URLSession.shared.dataTaskPublisher(for: url!)
// the dataTaskPublisher output combination is (data: Data, response: URLResponse)
.map { $0.data }
.decode(type: Sample.self, decoder: decoder)
.receive(on: DispatchQueue.main)
.eraseToAnyPublisher()
// Subscriber:
sub = remoteDataPublisher // ...must assign to an iVar to keep alive.
.sink(receiveCompletion: { completion in
switch completion {
case .finished:
break
case .failure(let anError):
self.networkMessage = anError.localizedDescription
self.hasAlert = true. // ... unable to host Alert().
}
}, receiveValue: { someValue in
print(".sink() received \(someValue)")
})
}
}
Question: Why am I not getting this alert() via
(isPresented: $standardWeatherReport.hasAlert)?

Answer 1

standardWeatherReport.hasAlert is not from the class PublishedWeatherReport.
where is the StandardWeatherReport class

Answer 2

I got two publishers mixed.
Hence the concerned alert wasn't functioning correctly.
Also I have multiple alert operators, each one per publisher.
This is a bad design: Only one (1) alert operator is allowed per host; otherwise the second .alert operator would override the previous operator.
So if one alert is active, a following inactive alert operator would immediately cancel it.