How do I present error banners in Combine with Swift?

In Swift, you can present error banners using Combine to notify users about an error state in your application. This involves creating a publisher that emits error events and subscribing to it to update the UI accordingly.

To implement this, follow these steps:

  • Create an error publisher.
  • Subscribe to the publisher and display the error banner when an error occurs.

Here's a basic example of how to achieve this:

import SwiftUI import Combine struct ContentView: View { @State private var showErrorBanner = false @State private var errorMessage: String = "" private var cancellables = Set() var body: some View { VStack { Button("Trigger Error") { self.triggerError() } if showErrorBanner { Text(errorMessage) .foregroundColor(.red) .padding() .background(Color.yellow) .cornerRadius(8) } } .padding() } func triggerError() { // Simulating an error event let errorPublisher = Fail(error: NSError(domain: "", code: -1, userInfo: [NSLocalizedDescriptionKey: "An error occurred"])) errorPublisher .receive(on: RunLoop.main) .handleEvents(receiveOutput: { _ in self.errorMessage = "An error has occurred!" self.showErrorBanner = true }) .sink(receiveCompletion: { completion in if case .failure(_) = completion { // Handle failure } DispatchQueue.main.asyncAfter(deadline: .now() + 3) { self.showErrorBanner = false } }, receiveValue: { _ in }) .store(in: &cancellables) } }

Swift Combine Error Handling SwiftUI UI Notifications

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