ios - 在 Swift 中将 responseJSON 更新为 responseDecodable

Question

我是 Swift 新手，我正在尝试升级一些旧的 Swift 代码。我收到以下警告:

'responseJSON(queue:dataPreprocessor:emptyResponseCodes:emptyRequestMethods:options:completionHandler:)' is deprecated: responseJSON deprecated and will be removed in Alamofire 6. Use responseDecodable instead.

...在下面的代码中:

extension Alamofire.DataRequest {
    func json(_ options: JSONSerialization.ReadingOptions = .allowFragments, successHandler: ((Any?) -> Void)? = nil, failureHandler: ((AFDataResponse<Any>) -> Void)? = nil) -> Self {
        return responseJSON() {
            response in
            if UtilityService.ensureSuccessful(response, failureHandler: { failureHandler?(response) }) {
                successHandler?(response.value)
            }
            NetworkActivityManager.sharedInstance.decrementActivityCount()
        }
    }
}

如果我用 responseDecodable 替换 responseJSON，我会收到以下错误:

Generic parameter 'T' could not be inferred

我需要做什么来更新此代码？

Answer 1

Alamofire推荐使用responseDecodable()因为人们经常使用 responseJSON() ，然后得到 response.data , 并调用 JSONDecoder()在上面。所以这是对 JSONSerialization 的内部调用不求返回”。此外，由于 Codable 是"new"的，并且仍然有旧问题可用，人们可能会错过 Codable 功能。见 this topic在 Alamofire repo 。
所以如果你使用 Codable , 我鼓励尽可能使用 responseDecodable()反而。
但是，您仍然可以手动完成，通过检索 Data没有转换:
为此，请使用:

@discardableResult func responseData(queue: DispatchQueue = .main, dataPreprocessor: DataPreprocessor = DataResponseSerializer.defaultDataPreprocessor, emptyResponseCodes: Set<Int> = DataResponseSerializer.defaultEmptyResponseCodes, emptyRequestMethods: Set<HTTPMethod> = DataResponseSerializer.defaultEmptyRequestMethods, completionHandler: @escaping (AFDataResponse<Data>) -> Void) -> Self

正在使用:

request.responseData { response in
    switch response.result {
        case .success(let data):
            do {
                let asJSON = try JSONSerialization.jsonObject(with: data)
                // Handle as previously success
            } catch {
                // Here, I like to keep a track of error if it occurs, and also print the response data if possible into String with UTF8 encoding
                // I can't imagine the number of questions on SO where the error is because the API response simply not being a JSON and we end up asking for that "print", so be sure of it
                print("Error while decoding response: "\(error)" from: \(String(data: data, encoding: .utf8))")
            }
        case .failure(let error):
            // Handle as previously error
        }
}