How do I log view lifecycle events in Combine with Swift?

Logging view lifecycle events in a Swift application that uses Combine can greatly assist in debugging and understanding the flow of your application. Here's how you can achieve this:

In your SwiftUI view, you can utilize the onAppear and onDisappear modifiers to log these lifecycle events. Combine can be integrated to listen for changes in your view model or data model, enhancing the ability to handle events effectively.

Below is an example of how to implement logging of view lifecycle events in a Combine-based Swift application:


        import SwiftUI
        import Combine

        class ViewModel: ObservableObject {
            @Published var data: String = "Initial Data"
            private var cancellables = Set()
            
            init() {
                // Example of observing data changes
                $data
                    .sink { newValue in
                        print("Data updated to: \(newValue)")
                    }
                    .store(in: &cancellables)
            }
        }

        struct ContentView: View {
            @StateObject private var viewModel = ViewModel()
            
            var body: some View {
                VStack {
                    Text(viewModel.data)
                    Button("Update Data") {
                        viewModel.data = "Updated Data"
                    }
                }
                .onAppear {
                    print("ContentView appeared")
                }
                .onDisappear {
                    print("ContentView disappeared")
                }
            }
        }

Swift Combine SwiftUI view lifecycle events logging Observables debugging

How do I log view lifecycle events in Combine with Swift?

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How do I log view lifecycle events in Combine with Swift?

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