Alamofire 5 响应可解码失败

Question

Alamofire has a nifty .responseDecodable function that makes parsing simple when request.result =.success but, how to decode an error object in case of failure ?

In my case, backend can return a myriad of errors since, for instance, a credit card charge may have an infinitude of reasons - OTP failed, declined etc.

Should i change my approach towards requests? Since Alamofire doesn't really support error handling (at least with responseDecodable ) as it stands.

Answer 1

As I understood response.result should be enum with 2 states: success(value) & failure(Error). You need to switch between them:

 switch response.result {
case .success(let value): print(value)
case .failure(let error): print(error)
}

Answer 2

This depends entirely on how your responses are structured. There are a few ways to approach this:

• Create an enum representing your responses, generic to the success (and perhaps failure) value. Something like APIResponse<Success> , which is itself Decodable and will try to parse the success value or an error from the response. This would allow you to keep using responseDecodable but you'll have to rectify response errors with request errors produced by Alamofire yourself.
• Create your own ResponseSerializer that knows how to decode success and failure values, which can you hook into Alamofire's response method.
• Relatedly, you can extend DataRequest with a custom response method that uses your custom serializer.