json - 如何通过 Swift 发送 POST 请求？

Question

我有这样的 Controller -

def create
   if (@user = User.find_by_email(params[:email])) && @user.valid_password?(params[:password])
      render json: @user.as_json(only: [:email,:authentication_token]),status: :created
   else 
      render json:('Unauthorized Access')
   end  
end 

当我使用 Postman 发出此请求时，我选择正文，然后形成数据并添加电子邮件和密码。这行得通

如何使用 swift 来做同样的事情？这是我试过的

let url = URL(string: "http://localhost:3000/api/v1/user_serialized/")

let config = URLSessionConfiguration.default

let request = NSMutableURLRequest(url: url!)

request.httpMethod = "POST"

let bodyData = "email=Test@test.com&password=Test1234"

request.httpBody = bodyData.data(using: String.Encoding.utf8);

let session = URLSession(configuration: config)

let task = session.dataTask(with: url! as URL, completionHandler: {(data, response, error) in
    let json = JSON(data:data!)

    debugPrint(json)
})

task.resume()

Answer 1

我创建了一个自定义 HTTP 类，我们可以在其中发送 url、参数，我们将从 API 获取数据。下面是类(class)。

import Foundation

//HTTP Methods
enum HttpMethod : String {
   case  GET
   case  POST
   case  DELETE
   case  PUT
}


class HttpClientApi: NSObject{

//TODO: remove app transport security arbitary constant from info.plist file once we get API's
 var request : URLRequest?
 var session : URLSession?

static func instance() ->  HttpClientApi{

    return HttpClientApi()
}



func makeAPICall(url: String,params: Dictionary<String, Any>?, method: HttpMethod, success:@escaping ( Data? ,HTTPURLResponse?  , NSError? ) -> Void, failure: @escaping ( Data? ,HTTPURLResponse?  , NSError? )-> Void) {

     request = URLRequest(url: URL(string: url)!)

    logging.print("URL = \(url)")

    if let params = params {


        let  jsonData = try? JSONSerialization.data(withJSONObject: params, options: .prettyPrinted)

        request?.setValue("application/json", forHTTPHeaderField: "Content-Type")
        request?.httpBody = jsonData//?.base64EncodedData()


        //paramString.data(using: String.Encoding.utf8)
    }
    request?.httpMethod = method.rawValue


    let configuration = URLSessionConfiguration.default

    configuration.timeoutIntervalForRequest = 30
    configuration.timeoutIntervalForResource = 30

    session = URLSession(configuration: configuration)
    //session?.configuration.timeoutIntervalForResource = 5
    //session?.configuration.timeoutIntervalForRequest = 5

    session?.dataTask(with: request! as URLRequest) { (data, response, error) -> Void in

        if let data = data {

            if let response = response as? HTTPURLResponse, 200...299 ~= response.statusCode {
                success(data , response , error as? NSError)
            } else {
                failure(data , response as? HTTPURLResponse, error as? NSError)
            }
        }else {

            failure(data , response as? HTTPURLResponse, error as? NSError)

        }
        }.resume()

  }

}

现在您可以引用下面的代码来了解如何进行 API 调用。

  var paramsDictionary = [String:Any]()

    paramsDictionary["username"] = "BBB"
    paramsDictionary["password"]    = "refef"

    HttpClientApi.instance().makeAPICall(url: "Your URL", params:paramsDictionary, method: .POST, success: { (data, response, error) in

        // API call is Successfull

    }, failure: { (data, response, error) in

        // API call Failure

    })