如何在Swift中创建NSURLSession POST请求

嗨，我是Swift的初学者，我正在努力使NSURLSession“发布”请求发送一些参数，如下面的代码

根据我的下面的代码响应不是来自服务器可以有人帮助我

BackGroundClass： –

import UIKit protocol sampleProtocal{ func getResponse(result:NSDictionary) func getErrorResponse(error:NSString) } class BackGroundClass: NSObject { var delegate:sampleProtocal? func callPostService(url:String,parameters:NSDictionary){ print("url is===>\(url)") let request = NSMutableURLRequest(URL: NSURL(string:url)!) let session = NSURLSession.sharedSession() request.HTTPMethod = "POST" //Note : Add the corresponding "Content-Type" and "Accept" header. In this example I had used the application/json. request.addValue("application/json", forHTTPHeaderField: "Content-Type") request.addValue("application/json", forHTTPHeaderField: "Accept") request.HTTPBody = try! NSJSONSerialization.dataWithJSONObject(parameters, options: []) let task = session.dataTaskWithRequest(request) { data, response, error in guard data != nil else { print("no data found: \(error)") return } do { if let json = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary { print("Response: \(json)") self.mainResponse(json) } else { let jsonStr = NSString(data: data!, encoding: NSUTF8StringEncoding)// No error thrown, but not NSDictionary print("Error could not parse JSON: \(jsonStr)") self.eroorResponse(jsonStr!) } } catch let parseError { print(parseError)// Log the error thrown by `JSONObjectWithData` let jsonStr = NSString(data: data!, encoding: NSUTF8StringEncoding) print("Error could not parse JSON: '\(jsonStr)'") self.eroorResponse(jsonStr!) } } task.resume() } func mainResponse(result:NSDictionary){ delegate?.getResponse(result) } func eroorResponse(result:NSString){ delegate?.getErrorResponse(result) } } 

视图控制器： –

 import UIKit class ViewController: UIViewController,sampleProtocal { override func viewDidLoad() { super.viewDidLoad() let delegate = BackGroundClass(); delegate.self; let params = ["scancode":"KK03799-008", "UserName":"admin"] as Dictionary let backGround=BackGroundClass(); backGround.callPostService("url", parameters: params) } func getResponse(result: NSDictionary) { print("Final response is\(result)"); } func getErrorResponse(error: NSString) { print("Final Eroor code is\(error)") } } 

Answer 1

Swift 4.0发布示例 –

 func postAction(_ sender: Any) { let Url = String(format: "your url") guard let serviceUrl = URL(string: Url) else { return } // let loginParams = String(format: LOGIN_PARAMETERS1, "test", "Hi World") let parameterDictionary = ["username" : "Test", "password" : "123456"] var request = URLRequest(url: serviceUrl) request.httpMethod = "POST" request.setValue("Application/json", forHTTPHeaderField: "Content-Type") guard let httpBody = try? JSONSerialization.data(withJSONObject: parameterDictionary, options: []) else { return } request.httpBody = httpBody let session = URLSession.shared session.dataTask(with: request) { (data, response, error) in if let response = response { print(response) } if let data = data { do { let json = try JSONSerialization.jsonObject(with: data, options: []) print(json) }catch { print(error) } } }.resume() } 

Answer 2

尝试运行此函数并打印响应，它在Swift 4.0中。

在这里，我准备了可编码的结构：

 struct LoginData: Codable { var code: Int? var message: String? var status: String? var token: String? var data: DataSet? } struct DataSet: Codable { var email : String? var contactNo : String? var firstName : String? var lastName: String? var dob : String? var gender : String? var address: String? var city : String? var state : String? var country : String? var zip : String? var username: String? } 

如果您正确打印了响应，则将其传递给viewController。

 func loginWS(parameters:[String:String], completionHandler: @escaping (Any?) -> Swift.Void) { guard let gitUrl = URL(string: BASE_URL+ACTION_URL) else { return } print(gitUrl) let request = NSMutableURLRequest(url: gitUrl) // uncomment this and add auth token, if your project needs. // let config = URLSessionConfiguration.default // let authString = "Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyX2lkIjoxMywiUGFzc3dvcmQiOiIkMmEkMTAkYVhpVm9wU3JSLjBPYmdMMUk2RU5zdU9LQzlFR0ZqNzEzay5ta1pDcENpMTI3MG1VLzR3SUsiLCJpYXQiOjE1MTczOTc5MjV9.JaSh3FvpAxFxbq8z_aZ_4OhrWO-ytBQNu6A-Fw4pZBY" // config.httpAdditionalHeaders = ["Authorization" : authString] let session = URLSession.shared request.httpMethod = "POST" request.addValue("application/json", forHTTPHeaderField: "Content-Type") request.addValue("application/json", forHTTPHeaderField: "Accept") request.httpBody = try! JSONSerialization.data(withJSONObject: parameters, options: []) let task = session.dataTask(with: request as URLRequest) { data, response, error in guard let data = data else { return } do { // let decoder = JSONDecoder() // here replace LoginData with your codable structure. let gitData = try JSONDecoder().decode(LoginData.self, from: data) print("response data:", gitData) completionHandler(gitData) } catch let err { print("Err", err) } }.resume() } 

Answer 3

邮政课程

 func post(params : Dictionary, url : String) { var request = NSMutableURLRequest(URL: NSURL(string: url)) var session = NSURLSession.sharedSession() request.HTTPMethod = "POST" var err: NSError? request.HTTPBody = NSJSONSerialization.dataWithJSONObject(params, options: nil, error: &err) request.addValue("application/json", forHTTPHeaderField: "Content-Type") request.addValue("application/json", forHTTPHeaderField: "Accept") var task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in println("Response: \(response)") var strData = NSString(data: data, encoding: NSUTF8StringEncoding) println("Body: \(strData)") var err: NSError? var json = NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves, error: &err) as? NSDictionary // Did the JSONObjectWithData constructor return an error? If so, log the error to the console if(err != nil) { println(err!.localizedDescription) let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding) println("Error could not parse JSON: '\(jsonStr)'") } else { // The JSONObjectWithData constructor didn't return an error. But, we should still // check and make sure that json has a value using optional binding. if let parseJSON = json { // Okay, the parsedJSON is here, let's get the value for 'success' out of it var success = parseJSON["success"] as? Int println("Succes: \(success)") } else { // Woa, okay the json object was nil, something went worng. Maybe the server isn't running? let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding) println("Error could not parse JSON: \(jsonStr)") } } }) task.resume() } 

称这个方法像这样

  self.post(["username":"jameson", "password":"password"], url: "http://localhost:4567/login") 

希望能帮助到你 ：）

Answer 4

Http身体不见了。 示例 – 将字符串参数设置为正文

 let paramString = String(format:"param1=%@&param2=%@",param1,param2) request.httpBody = paramString.data(using: String.Encoding.utf8) 

这里试试吧

 request.httpBody = NSJSONSerialization.dataWithJSONObject(params, options: nil, error: &err) 

Answer 5

 func getData(searchString:String,completion:@escaping(Any)->Void){ let url = "https://itunes.apple.com/search?term="+searchString URLSession.shared.dataTask(with: URL.init(string: url)!){(data,response,err) in if let responsedata = data{ DispatchQueue.main.async { completion(responsedata) } } }.resume() }