对于这个请求:
Alamofire.request("https://google.com").responseCollection { (response: DataResponse<[User]>) in
guard response.result.isSuccess else {
print(response.error)
return
}
}
我在控制台中看到打印的内容:
可选(my_app_name.BackendError.jsonSerialization(Alamofire.AFError.responseSerializationFailed(Alamofire.AFError.ResponseSerializationFailureReason.jsonSerializationFailed(错误
Domain = NSCocoaErrorDomain Code = 3840“字符周围的值无效
0." UserInfo={NSDebugDescription=字符 0 周围的值无效。}))))
我尝试过的:
Alamofire.request("https://google.com").responseCollection { (response: DataResponse<[User]>) in
guard response.result.isSuccess else {
print(response.error)
if let error1 = response.error as? AFError {
print(error1) // Execution DOES NOT reach here.
}
if let error2 = response.error as? BackendError {
print(error2) // Execution DOES reach here.
}
return
}
}
print(error2)
上面打印:
jsonSerialization(Alamofire.AFError.responseSerializationFailed(Alamofire.AFError.ResponseSerializationFailureReason.jsonSerializationFailed(错误
Domain = NSCocoaErrorDomain Code = 3840“字符周围的值无效
0." UserInfo={NSDebugDescription=字符 0 周围的值无效。})))
我想做的是找出潜在的错误,这样我就可以解析domain
, code
, and userInfo
特性。
我创建了BackendError
Alamofire 提供的枚举作为示例https://github.com/Alamofire/Alamofire#handling-errors https://github.com/Alamofire/Alamofire#handling-errors :
enum BackendError: Error {
case network(error: Error) // Capture any underlying Error from the URLSession API
case dataSerialization(error: Error)
case jsonSerialization(error: Error)
case xmlSerialization(error: Error)
case objectSerialization(reason: String)
}
我还实现了示例通用响应对象序列化,与示例完全一样https://github.com/Alamofire/Alamofire#generic-response-object-serialization https://github.com/Alamofire/Alamofire#generic-response-object-serialization :
extension DataRequest {
@discardableResult
func responseCollection<T: ResponseCollectionSerializable>(
queue: DispatchQueue? = nil,
completionHandler: @escaping (DataResponse<[T]>) -> Void) -> Self {
let responseSerializer = DataResponseSerializer<[T]> { request, response, data, error in
guard error == nil else {
return .failure(BackendError.network(error: error!))
}
let jsonSerializer = DataRequest.jsonResponseSerializer(options: .allowFragments)
let result = jsonSerializer.serializeResponse(request, response, data, nil)
guard case let .success(jsonObject) = result else {
return .failure(BackendError.jsonSerialization(error: result.error!))
}
guard let response = response else {
let reason = "Response collection could not be serialized due to nil response."
return .failure(BackendError.objectSerialization(reason: reason))
}
return .success(T.collection(from: response, withRepresentation: jsonObject))
}
return response(responseSerializer: responseSerializer, completionHandler: completionHandler)
}
}
我认为有switch
es, case
s,并投射到和来自BackendError
, AFError
, Error
,和/或NSError
,但我似乎无法理解。
我怎样才能得到潜在的错误,以便我可以解析domain
, code
, and userInfo
特性?
我正在使用 Swift 3 和 Alamofire 4.3.0 。