Alamofire的Swift擴展方法返回SwiftyJSON結果

Question

我將一個應用程序從Swift 2.2遷移到3.0，它使用GitHub上的Alamofire-SwiftyJSON項目的擴展方法。 Alamofire-SwiftyJSON允許接收從轉換爲SwiftyJSON實例類似這樣的Alamofire網絡請求的響應：

Alamofire.request(.GET, "http://httpbin.org/get", parameters: ["foo": "bar"]) 
    .responseSwiftyJSON({ (request, response, json, error) in 
     print(json) // json is a SwiftyJSON 'JSON' instance 
     print(error) 
    }) 

的Alamofire-SwiftyJSON項目沒有更新的夫特3作爲寫這一問題。我正在尋找與Swift 3+和Alamofire 4+兼容的responseSwiftyJSON擴展方法的等效實現。

Answer 1

擴展方法

該解決方案結合了來自SwiftyJSON readme與Alamofire工作的建議。

它是基於在ResponseSerialization.swift附帶Alamofire類似擴展：

• DataRequest.responseJSON(queue:options:completionHandler:)
• DataRequest.jsonResponseSerializer(options:)

該溶液可與夫特3及以上。它使用Alamofire 4.2+和SwiftyJSON 3.1.3+進行測試。

import Alamofire 
import SwiftyJSON 

extension DataRequest { 

    /// Adds a handler to be called once the request has finished. 
    /// 
    /// - parameter options:   The JSON serialization reading options. Defaults to `.allowFragments`. 
    /// - parameter completionHandler: A closure to be executed once the request has finished. 
    /// 
    /// - returns: The request. 
    @discardableResult 
    public func responseSwiftyJSON(
     queue: DispatchQueue? = nil, 
     options: JSONSerialization.ReadingOptions = .allowFragments, 
     completionHandler: @escaping (DataResponse<JSON>) -> Void) -> Self { 
      return response(
       queue: queue, 
       responseSerializer: DataRequest.swiftyJSONResponseSerializer(options: options), 
       completionHandler: completionHandler 
      ) 
    } 

    /// Creates a response serializer that returns a SwiftyJSON instance result type constructed from the response data using 
    /// `JSONSerialization` with the specified reading options. 
    /// 
    /// - parameter options: The JSON serialization reading options. Defaults to `.allowFragments`. 
    /// 
    /// - returns: A SwiftyJSON response serializer. 
    public static func swiftyJSONResponseSerializer(
     options: JSONSerialization.ReadingOptions = .allowFragments) -> DataResponseSerializer<JSON> { 
      return DataResponseSerializer { _, response, data, error in 
       let result = Request.serializeResponseJSON(options: options, response: response, data: data, error: error) 
       switch result { 
        case .success(let value): 
         return .success(JSON(value)) 
        case .failure(let error): 
         return .failure(error) 
       } 
      } 
    } 
} 

示例使用：

Alamofire.request("https://httpbin.org/get").validate().responseSwiftyJSON { 
     response in 

     print("Response: \(response)") 

     switch response.result { 
      case .success(let json): 
       // Use SwiftyJSON instance 
       print("JSON: \(json)") 

      case .failure(let error): 
       // Handle error 
       print("Error: \(error)") 
     } 
    }