Response 0.0.2

You want to add pod 'Response', '~> 0.0' similar to the following to your Podfile:

target 'MyApp' do
  pod 'Response', '~> 0.0'
end

Then run a pod install inside your terminal, or from CocoaPods.app.

Alternatively to give it a test run, run the command:

pod try Response

Response 0.0.2

By
Valery Fomenko

Asyncronous callbacks conflict with standard Swift error handling.

Response helps to fix this.

Classical interfaces using completion handlers look like this:

protocol MessageService {
    func get(id: String, completionHandler: (Message?, Error?) -> Void)
}

let messages: MessageService = //
messages.get(id: "123") { message, error in
    // implicit convention that there are two valid combinations
    // (message, nil)
    // (nil, error)
        
    // Swift error handling is not applicable
        
    if let message = message {
        //
    } else if let error = error {
        //
    } else {
        // ??
    }
}

Same example using Response:

import Response

protocol MessageService {
    func get(id: String, responseHandler: Response<Message>.Handler)
}

let messages: MessageService = //
messages.get(id: "123") { response in
    do {
        let message = try response.result()
        //
    } catch {
        //
    }
}