如何在 Swift 中解析来自 Alamofire API 的 JSON 响应？

Question

按照我编写的代码，我也收到了 JSON 格式的响应，但 JSON 的类型是“AnyObject”，我无法将其转换为数组以便我可以使用它。

Alamofire.request(.POST, "MY URL", parameters:parameters, encoding: .JSON) .responseJSON
{
    (request, response, JSON, error) in

    println(JSON?)
}

Answer 1

Swift 2.0 Alamofire 3.0 的答案实际上应该更像这样：

Alamofire.request(.POST, url, parameters: parameters, encoding:.JSON).responseJSON
{ response in switch response.result {
                case .Success(let JSON):
                    print("Success with JSON: \(JSON)")

                    let response = JSON as! NSDictionary

                    //example if there is an id
                    let userId = response.objectForKey("id")!

                case .Failure(let error):
                    print("Request failed with error: \(error)")
                }
    }

https://github.com/Alamofire/Alamofire/blob/master/Documentation/Alamofire%203.0%20Migration%20Guide.md

Alamofire 4.0 和 Swift 3.0 更新：

Alamofire.request(url, method: .post, parameters: parameters, encoding: JSONEncoding.default)
            .responseJSON { response in
                print(response)
//to get status code
                if let status = response.response?.statusCode {
                    switch(status){
                    case 201:
                        print("example success")
                    default:
                        print("error with response status: \(status)")
                    }
                }
//to get JSON return value
            if let result = response.result.value {
                let JSON = result as! NSDictionary
                print(JSON)
            }

        }

Answer 2

如上所述，您可以使用 SwiftyJSON 库并像我在下面所做的那样获取您的值

Alamofire.request(.POST, "MY URL", parameters:parameters, encoding: .JSON) .responseJSON
{
    (request, response, data, error) in

var json = JSON(data: data!)

       println(json)   
       println(json["productList"][1])                 

}

我的 json 产品列表从脚本返回

{ "productList" :[

{"productName" : "PIZZA","id" : "1","productRate" : "120.00","productDescription" : "PIZZA AT 120Rs","productImage" : "uploads\/pizza.jpeg"},

{"productName" : "BURGER","id" : "2","productRate" : "100.00","productDescription" : "BURGER AT Rs 100","productImage" : "uploads/Burgers.jpg"}    
  ]
}

输出：

{
  "productName" : "BURGER",
  "id" : "2",
  "productRate" : "100.00",
  "productDescription" : "BURGER AT Rs 100",
  "productImage" : "uploads/Burgers.jpg"
}

Answer 3

Swift 3、Alamofire 4.4 和 SwiftyJSON：

Alamofire.request(url, method: .get)
  .responseJSON { response in
      if response.data != nil {
        let json = JSON(data: response.data!)
        let name = json["people"][0]["name"].string
        if name != nil {
          print(name!)
        }
      }
  }

这将解析这个 JSON 输入：

{
  people: [
    { name: 'John' },
    { name: 'Dave' }
  ]
}

Answer 4

我在 GitHub 上找到了 Swift2

的答案

https://github.com/Alamofire/Alamofire/issues/641

Alamofire.request(.GET, URLString, parameters: ["foo": "bar"])
    .responseJSON { request, response, result in
        switch result {
        case .Success(let JSON):
            print("Success with JSON: \(JSON)")

        case .Failure(let data, let error):
            print("Request failed with error: \(error)")

            if let data = data {
                print("Response data: \(NSString(data: data, encoding: NSUTF8StringEncoding)!)")
            }
        }
    }

Answer 5

我既不是 JSON 专家也不是 Swift 专家，但以下内容对我有用。 :) 我已经从我当前的应用程序中提取了代码，并且只将“MyLog 更改为 println”，并用空格缩进以使其显示为代码块（希望我没有破坏它）。

func getServerCourseVersion(){

    Alamofire.request(.GET,"\(PUBLIC_URL)/vtcver.php")
        .responseJSON { (_,_, JSON, _) in
          if let jsonResult = JSON as? Array<Dictionary<String,String>> {
            let courseName = jsonResult[0]["courseName"]
            let courseVersion = jsonResult[0]["courseVersion"]
            let courseZipFile = jsonResult[0]["courseZipFile"]

            println("JSON:    courseName: \(courseName)")
            println("JSON: courseVersion: \(courseVersion)")
            println("JSON: courseZipFile: \(courseZipFile)")

          }
      }
}

希望这会有所帮助。

编辑：

作为参考，这是我的 PHP 脚本返回的内容：

[{"courseName": "Training Title","courseVersion": "1.01","courseZipFile": "101/files.zip"}]

Answer 6

斯威夫特 5

class User: Decodable {

    var name: String
    var email: String
    var token: String

    enum CodingKeys: String, CodingKey {
        case name
        case email
        case token
    }

    public required init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        self.name = try container.decode(String.self, forKey: .name)
        self.email = try container.decode(String.self, forKey: .email)
        self.token = try container.decode(String.self, forKey: .token)
    }
}

Alamofire API

    Alamofire.request("url.endpoint/path", method: .get, parameters: params, encoding: URLEncoding.queryString, headers: nil)
     .validate()
     .responseJSON { response in

        switch (response.result) {

            case .success( _):

            do {
                let users = try JSONDecoder().decode([User].self, from: response.data!)
                print(users)

            } catch let error as NSError {
                print("Failed to load: \(error.localizedDescription)")
            }

             case .failure(let error):
                print("Request error: \(error.localizedDescription)")
         }

Answer 7

斯威夫特 3

pod 'Alamofire', '~> 4.4'
pod 'SwiftyJSON'

File json format:
{
    "codeAd": {
        "dateExpire": "2017/12/11",
        "codeRemoveAd":"1231243134"
        }
}

import Alamofire
import SwiftyJSON
    private func downloadJson() {
        Alamofire.request("https://yourlinkdownloadjson/abc").responseJSON { response in
            debugPrint(response)

            if let json = response.data {
                let data = JSON(data: json)
                print("data\(data["codeAd"]["dateExpire"])")
                print("data\(data["codeAd"]["codeRemoveAd"])")
            }
        }
    }

Answer 8

这是使用 Xcode 10.1 和 Swift 4 构建的

“Alamofire”(4.8.1) 和“SwiftyJSON”(4.2.0) 的完美组合。首先你应该安装两个 pod

pod 'Alamofire' 和 pod 'SwiftyJSON'

JSON 格式的服务器响应：

{
  "args": {}, 
  "headers": {
    "Accept": "*/*", 
    "Accept-Encoding": "gzip;q=1.0, compress;q=0.5", 
    "Accept-Language": "en;q=1.0", 
    "Host": "httpbin.org", 
    "User-Agent": "AlamoFire TEST/1.0 (com.ighost.AlamoFire-TEST; build:1; iOS 12.1.0) Alamofire/4.8.1"
  }, 
  "origin": "200.55.140.181, 200.55.140.181", 
  "url": "https://httpbin.org/get"
}

在这种情况下，我想打印“主机”信息：“主机”：“httpbin.org”

Alamofire.request("https://httpbin.org/get").validate().responseJSON { response in
        switch response.result {
        case .success:
            print("Validation Successful)")

            if let json = response.data {
                do{
                    let data = try JSON(data: json)
                    let str = data["headers"]["Host"]
                    print("DATA PARSED: \(str)")
                }
                catch{
                print("JSON Error")
                }

            }
        case .failure(let error):
            print(error)
        }
    }

保持冷静和快乐的代码?

Answer 9

我找到了一种将 response.result.value（在 Alamofire responseJSON 闭包内）转换为我在我的应用程序中使用的 JSON 格式的方法。

我正在使用 Alamofire 3 和 Swift 2.2。

这是我使用的代码：

    Alamofire.request(.POST, requestString,
                      parameters: parameters,
                      encoding: .JSON,
                      headers: headers).validate(statusCode: 200..<303)
                                       .validate(contentType: ["application/json"])
                                       .responseJSON { (response) in
        NSLog("response = \(response)")

        switch response.result {
        case .Success:
            guard let resultValue = response.result.value else {
                NSLog("Result value in response is nil")
                completionHandler(response: nil)
                return
            }

            let responseJSON = JSON(resultValue)

            // I do any processing this function needs to do with the JSON here

            // Here I call a completionHandler I wrote for the success case
        break
        case .Failure(let error):
            NSLog("Error result: \(error)")
            // Here I call a completionHandler I wrote for the failure case
            return
        }

Answer 10

我通常在 iOS 中使用Gloss 库来序列化或反序列化 JSON。例如，我有如下所示的 JSON：

{"ABDC":[{"AB":"qwerty","CD":"uiop"}],[{"AB":"12334","CD":"asdf"}]}

首先，我在 Gloss 结构中对 JSON 数组进行建模：

Struct Struct_Name: Decodable {
   let IJ: String?
   let KL: String?
   init?(json: JSON){
       self.IJ = "AB" <~~ json
       self.KL = "CD" <~~ json
   }
}

然后在 Alamofire responseJSON 中，我执行以下操作：

Alamofire.request(url, method: .get, paramters: parametersURL).validate(contentType: ["application/json"]).responseJSON{ response in
 switch response.result{
   case .success (let data):
    guard let value = data as? JSON,
       let eventsArrayJSON = value["ABDC"] as? [JSON]
    else { fatalError() }
    let struct_name = [Struct_Name].from(jsonArray: eventsArrayJSON)//the JSON deserialization is done here, after this line you can do anything with your JSON
    for i in 0 ..< Int((struct_name?.count)!) {
       print((struct_name?[i].IJ!)!)
       print((struct_name?[i].KL!)!)
    }
    break

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

上面代码的输出：

qwerty
uiop
1234
asdf

Answer 11

在 swift 5 中，我们确实喜欢使用 typealias 来完成。 Typlealias 只是用来清理代码而已。

typealias response = (Bool,Any?)->()


static func postCall(_ url : String, param : [String : Any],completion : @escaping response){
    Alamofire.request(url, method: .post, parameters: param, encoding: JSONEncoding.default, headers: [:]).responseJSON { (response) in

        switch response.result {
           case .success(let JSON):
               print("\n\n Success value and JSON: \(JSON)")

           case .failure(let error):
               print("\n\n Request failed with error: \(error)")

           }
    }
}

Answer 12

简单的答案是让 AlamoFire 直接进行解码。

令人惊讶的是，您没有使用 .responseJSON，因为它返回一个无类型的 json 对象

相反，您将对象设为可解码 - 并要求 AF 直接对它们进行解码

我的 json 响应包含一个 Account 对象数组。我只关心 id 和 name 键（虽然还有更多）

struct Account:Codable {
    let id:Int
    let name:String
}

那么简单

    AF.request(url,
               method: .get)
        .responseDecodable(of:[Account].self) { response in
            switch response.result {
            case .success:
                switch response.response?.statusCode {
                case 200:
                    //response.value is of type [Account]
                default:
                    //handle other cases
                }
            case let .failure(error):
                //probably the decoding failed because your json doesn't match the expected format
            }
        }

Answer 13

let semaphore = DispatchSemaphore (value: 0)

        var request = URLRequest(url: URL(string: Constant.localBaseurl2 + "compID")!,timeoutInterval: Double.infinity)
                            request.httpMethod = "GET"
                            let task = URLSession.shared.dataTask(with: request) { data, response, error in
                                if let response = response {
                                let nsHTTPResponse = response as! HTTPURLResponse
                                print(nsHTTPResponse)
                                          
                                }
                                if let error = error {
                                print ("\(error)")
                                    return
                                 }
                                
                                if let data = data {
                                    DispatchQueue.main.async {
                                        
                                        let decoder = JSONDecoder()
                                        decoder.keyDecodingStrategy = .convertFromSnakeCase//or any other Decoder\
                                        
                                        do{
                                            
                                            let jsonDecoder = JSONDecoder()
                                            let memberRecord = try jsonDecoder.decode(COMPLAINTSVC.GetComplaints.self, from: data)
                                            print(memberRecord.message)
                                         
                                            for detailData in memberRecord.message{
                                                print(detailData)
                                                
                                                
                                                
                                                
                                            
                                            }
                                            
                                            
                                            
                                        }catch{
                                            
                                            print(error.localizedDescription)
                                        }
                                        
                                      
                                        
                                    }
                             
                                }
                              
                              semaphore.signal()
                            }

                            task.resume()
                            semaphore.wait()

}

Answer 14

 pod 'Alamofire'
 pod 'SwiftyJSON'
 pod 'ReachabilitySwift'



import UIKit
import Alamofire
import SwiftyJSON
import SystemConfiguration

class WebServiceHelper: NSObject {

    typealias SuccessHandler = (JSON) -> Void
    typealias FailureHandler = (Error) -> Void

    // MARK: - Internet Connectivity

    class func isConnectedToNetwork() -> Bool {

        var zeroAddress = sockaddr_in()
        zeroAddress.sin_len = UInt8(MemoryLayout<sockaddr_in>.size)
        zeroAddress.sin_family = sa_family_t(AF_INET)

        guard let defaultRouteReachability = withUnsafePointer(to: &zeroAddress, {
            $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
                SCNetworkReachabilityCreateWithAddress(nil, $0)
            }
        }) else {
            return false
        }

        var flags: SCNetworkReachabilityFlags = []
        if !SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) {
            return false
        }

        let isReachable = flags.contains(.reachable)
        let needsConnection = flags.contains(.connectionRequired)

        return (isReachable && !needsConnection)
    }

    // MARK: - Helper Methods

    class func getWebServiceCall(_ strURL : String, isShowLoader : Bool, success : @escaping SuccessHandler, failure : @escaping FailureHandler)
    {
        if isConnectedToNetwork() {

            print(strURL)

            if isShowLoader == true {

                AppDelegate.getDelegate().showLoader()
            }

            Alamofire.request(strURL).responseJSON { (resObj) -> Void in

                print(resObj)

                if resObj.result.isSuccess {
                    let resJson = JSON(resObj.result.value!)

                    if isShowLoader == true {
                        AppDelegate.getDelegate().dismissLoader()
                    }

                    debugPrint(resJson)
                    success(resJson)
                }
                if resObj.result.isFailure {
                    let error : Error = resObj.result.error!

                    if isShowLoader == true {
                        AppDelegate.getDelegate().dismissLoader()
                    }
                    debugPrint(error)
                    failure(error)
                }
            }
        }else {


            CommonMethods.showAlertWithError("", strMessage: Messages.NO_NETWORK, withTarget: (AppDelegate.getDelegate().window!.rootViewController)!)
        }
    }

    class func getWebServiceCall(_ strURL : String, params : [String : AnyObject]?, isShowLoader : Bool, success : @escaping SuccessHandler,  failure :@escaping FailureHandler){
        if isConnectedToNetwork() {

            if isShowLoader == true {
                AppDelegate.getDelegate().showLoader()
            }


            Alamofire.request(strURL, method: .get, parameters: params, encoding: JSONEncoding.default, headers: nil).responseJSON(completionHandler: {(resObj) -> Void in

                print(resObj)

                if resObj.result.isSuccess {
                    let resJson = JSON(resObj.result.value!)

                    if isShowLoader == true {
                        AppDelegate.getDelegate().dismissLoader()
                    }

                    success(resJson)
                }
                if resObj.result.isFailure {
                    let error : Error = resObj.result.error!

                    if isShowLoader == true {
                        AppDelegate.getDelegate().dismissLoader()
                    }

                    failure(error)
                }

            })
        }
    else {

            CommonMethods.showAlertWithError("", strMessage: Messages.NO_NETWORK, withTarget: (AppDelegate.getDelegate().window!.rootViewController)!)
    }

    }



    class func postWebServiceCall(_ strURL : String, params : [String : AnyObject]?, isShowLoader : Bool, success : @escaping SuccessHandler, failure :@escaping FailureHandler)
    {
        if isConnectedToNetwork()
        {

            if isShowLoader == true
            {
                AppDelegate.getDelegate().showLoader()
            }

            Alamofire.request(strURL, method: .post, parameters: params, encoding: JSONEncoding.default, headers: nil).responseJSON(completionHandler: {(resObj) -> Void in

                print(resObj)

                if resObj.result.isSuccess
                {
                    let resJson = JSON(resObj.result.value!)

                    if isShowLoader == true
                    {
                        AppDelegate.getDelegate().dismissLoader()
                    }

                    success(resJson)
                }

                if resObj.result.isFailure
                {
                    let error : Error = resObj.result.error!

                    if isShowLoader == true
                    {
                        AppDelegate.getDelegate().dismissLoader()
                    }

                    failure(error)
                }
            })
        }else {
            CommonMethods.showAlertWithError("", strMessage: Messages.NO_NETWORK, withTarget: (AppDelegate.getDelegate().window!.rootViewController)!)
        }
    }


    class func postWebServiceCallWithImage(_ strURL : String, image : UIImage!, strImageParam : String, params : [String : AnyObject]?, isShowLoader : Bool, success : @escaping SuccessHandler, failure : @escaping FailureHandler)
    {
        if isConnectedToNetwork() {
            if isShowLoader == true
            {
                AppDelegate.getDelegate().showLoader()
            }

            Alamofire.upload(
                multipartFormData: { multipartFormData in
                    if let imageData = UIImageJPEGRepresentation(image, 0.5) {
                        multipartFormData.append(imageData, withName: "Image.jpg")
                    }

                    for (key, value) in params! {

                        let data = value as! String

                        multipartFormData.append(data.data(using: String.Encoding.utf8)!, withName: key)
                        print(multipartFormData)
                    }
                },
                to: strURL,
                encodingCompletion: { encodingResult in
                    switch encodingResult {
                    case .success(let upload, _, _):
                        upload.responseJSON { response in
                            debugPrint(response)
                            //let datastring = String(data: response, encoding: String.Encoding.utf8)
                           // print(datastring)
                        }
                    case .failure(let encodingError):
                        print(encodingError)
                        if isShowLoader == true
                        {
                            AppDelegate.getDelegate().dismissLoader()
                        }

                        let error : NSError = encodingError as NSError
                        failure(error)
                    }

                    switch encodingResult {
                    case .success(let upload, _, _):
                        upload.responseJSON { (response) -> Void in

                            if response.result.isSuccess
                            {
                                let resJson = JSON(response.result.value!)

                                if isShowLoader == true
                                {
                                    AppDelegate.getDelegate().dismissLoader()
                                }

                                success(resJson)
                            }

                            if response.result.isFailure
                            {
                                let error : Error = response.result.error! as Error

                                if isShowLoader == true
                                {
                                    AppDelegate.getDelegate().dismissLoader()
                                }

                                failure(error)
                            }

                        }
                    case .failure(let encodingError):
                        if isShowLoader == true
                        {
                            AppDelegate.getDelegate().dismissLoader()
                        }

                        let error : NSError = encodingError as NSError
                        failure(error)
                    }
                }
            )
        }
        else
        {
            CommonMethods.showAlertWithError("", strMessage: Messages.NO_NETWORK, withTarget: (AppDelegate.getDelegate().window!.rootViewController)!)
        }
    }

}


==================================


Call Method


let aParams : [String : String] = [
                "ReqCode" : Constants.kRequestCodeLogin,
                ]

            WebServiceHelper.postWebServiceCall(Constants.BaseURL, params: aParams as [String : AnyObject]?, isShowLoader: true, success: { (responceObj) in


                if "\(responceObj["RespCode"])" != "1"
                {
                    let alert = UIAlertController(title: Constants.kAppName, message: "\(responceObj["RespMsg"])", preferredStyle: UIAlertControllerStyle.alert)
                    let OKAction = UIAlertAction(title: "OK", style: .default) { (action:UIAlertAction!) in
                    }
                    alert.addAction(OKAction)
                    self.present(alert, animated: true, completion: nil)
                }
                else
                {
                    let aParams : [String : String] = [
                        "Password" : self.dictAddLogin[AddLoginConstants.kPassword]!,
                        ]
                    CommonMethods.saveCustomObject(aParams as AnyObject?, key: Constants.kLoginData)

                }
                }, failure:
                { (error) in

                    CommonMethods.showAlertWithError(Constants.kALERT_TITLE_Error, strMessage: error.localizedDescription,withTarget: (AppDelegate.getDelegate().window!.rootViewController)!)
            })
        }