What are error handling patterns for Combine in Swift?

Combine is a powerful framework in Swift for handling asynchronous events and data streams. Error handling in Combine can be done using several patterns. This article discusses common error handling patterns in Combine and provides examples for each.

Combine, Swift, Error Handling, Combine Framework, Asynchronous Programming

Learn about various error handling patterns in Swift's Combine framework for managing asynchronous events and ensuring robust data streams.

// Example of Basic Error Handling in Combine import Combine enum NetworkError: Error { case badURL case requestFailed case unknown } let url = URL(string: "https://api.example.com/data")! var cancellable: AnyCancellable? = URLSession.shared.dataTaskPublisher(for: url) .map(\.data) .decode(type: YourModel.self, decoder: JSONDecoder()) .mapError { error -> NetworkError in // Handle different error cases if let urlError = error as? URLError { switch urlError.code { case .badURL: return .badURL case .timedOut: return .requestFailed default: return .unknown } } return .unknown } .receive(on: RunLoop.main) .sink(receiveCompletion: { completion in switch completion { case .finished: print("Finished successfully") case .failure(let error): print("Error occurred: \(error)") } }, receiveValue: { model in print("Received model: \(model)") }) // Don't forget to store the cancellable for the subscription to remain active.

Combine Swift Error Handling Combine Framework Asynchronous Programming

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