Question 202675 in IOS Swift Question posted in
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Ios swift – fire an publisher after another

I want to fire two publishers but second should only fire when first one is complete. I tried it with zip could not achieve it. Following is my code:

    let resetPasscodeConfirmationPublisher = authUseCase.resetPasscodeConfirmation(phoneNumber: phoneNumber, code: pincode, passcode: passcode)
        
    
    let getAuthTokenPublisher = authUseCase.getAccessToken(passcode: passcode)
        
        resetPasscodeConfirmationPublisher.zip(getAuthTokenPublisher).sink { res in
            print(res)
        } receiveValue: { values in
            print(values.0)
            print(values.1)
        }.store(in: &cancellables)

so first, resetPasscodeConfirmationPublisher should run and when it is done and I get some value from it getAuthTokenPublisher should run. Right now I am getting response from getAuthTokenPublisher only and not from the first publisher.

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2

Answers


  1. 0

    You can use a map operator to do that

    resetPasscodeConfirmationPublisher
    .map { result in
        // do what you need with the result
        return getAuthTokenPublisher
    }
    .switchToLatest()
    .sink(
        receiveCompletion: { completion in

        },
        receiveValue: { value in

        }
    )
    .store(in: &cancellables)
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  2. 0

    This can help? I don’t sure to understand the question but I think you can start the second publisher on receiveCompletion of first publisher.

    import SwiftUI
import Combine

var cancellables: Set<AnyCancellable> = []

struct ContentView: View {
    var body: some View {
        VStack {
            Image(systemName: "globe")
                .imageScale(.large)
                .foregroundColor(.accentColor)
            Text("Hello, world!")
        }
        .padding()
        .onAppear {
            
            let resetPasscodeConfirmationPublisher = ["p1", "p2", "p3"]
            
            
            let getAuthTokenPublisher = ["a1", "a2", "a3" ]
            
            
            resetPasscodeConfirmationPublisher.publisher
                .sink(
                    receiveCompletion: { completion in
                        getAuthTokenPublisher.publisher
                            .sink { val in
                                debugPrint(val)
                            }
                            .store(in: &cancellables)
                    },
                    receiveValue: { value in
                        debugPrint(value)
                    }
                )
                .store(in: &cancellables)
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}
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