NSURLConnection Using iOS Swift

Question

I am trying to follow this tutorial and connect to a JSON api using Swift and NSURLConnection. I can see that it is hitting the url but the connectionDidFinishLoading does not seem to fire.

import UIKit  class Remote: NSObject {      var host = "http://localhost:3000"     var query = String()     var data: NSMutableData = NSMutableData()      func connect(query:NSString) {         self.query = query         var url = self.document()         var conn = NSURLConnection(request: url, delegate: self, startImmediately: true)     }      func endpoint() -> NSURL {         var query = self.host + self.query         return NSURL(string: query)     }      func document() -> NSURLRequest {         return NSURLRequest( URL: self.endpoint() )     }      func connection(didReceiveResponse: NSURLConnection!, didReceiveResponse response: NSURLResponse!) {         // Recieved a new request, clear out the data object         self.data = NSMutableData()     }      func connection(connection: NSURLConnection!, didReceiveData conData: NSData!) {         // Append the recieved chunk of data to our data object         self.data.appendData(conData)     }      func connectionDidFinishLoading(connection: NSURLConnection!) {         // Request complete, self.data should now hold the resulting info         // Convert the retrieved data in to an object through JSON deserialization         var err: NSError         var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(self.data, options:    NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary          println(jsonResult.count)     }   }   // Excecute the code  var remote = Remote() remote.connect("/apis") 

At this point I am just trying to see the data that is returned. I would like to hook it into a view controller once I am sure this is working. Is there something wrong with doing it this way and that is causing an issue?

Answer 1

Check Below Codes :

1. SynchronousRequest

Swift 1.2

    let urlPath: String = "YOUR_URL_HERE"     var url: NSURL = NSURL(string: urlPath)!     var request1: NSURLRequest = NSURLRequest(URL: url)     var response: AutoreleasingUnsafeMutablePointer<NSURLResponse?>=nil     var dataVal: NSData =  NSURLConnection.sendSynchronousRequest(request1, returningResponse: response, error:nil)!     var err: NSError     println(response)     var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(dataVal, options: NSJSONReadingOptions.MutableContainers, error: &err) as? NSDictionary     println("Synchronous\(jsonResult)") 

Swift 2.0 +

let urlPath: String = "YOUR_URL_HERE"     let url: NSURL = NSURL(string: urlPath)!     let request1: NSURLRequest = NSURLRequest(URL: url)     let response: AutoreleasingUnsafeMutablePointer<NSURLResponse?>=nil       do{          let dataVal = try NSURLConnection.sendSynchronousRequest(request1, returningResponse: response)              print(response)             do {                 if let jsonResult = try NSJSONSerialization.JSONObjectWithData(dataVal, options: []) as? NSDictionary {                     print("Synchronous\(jsonResult)")                 }             } catch let error as NSError {                 print(error.localizedDescription)             }        }catch let error as NSError     {          print(error.localizedDescription)     } 

2. AsynchonousRequest

Swift 1.2

let urlPath: String = "YOUR_URL_HERE"     var url: NSURL = NSURL(string: urlPath)!     var request1: NSURLRequest = NSURLRequest(URL: url)     let queue:NSOperationQueue = NSOperationQueue()     NSURLConnection.sendAsynchronousRequest(request1, queue: queue, completionHandler:{ (response: NSURLResponse!, data: NSData!, error: NSError!) -> Void in         var err: NSError         var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary         println("Asynchronous\(jsonResult)")        }) 

Swift 2.0 +

let urlPath: String = "YOUR_URL_HERE"     let url: NSURL = NSURL(string: urlPath)!     let request1: NSURLRequest = NSURLRequest(URL: url)     let queue:NSOperationQueue = NSOperationQueue()      NSURLConnection.sendAsynchronousRequest(request1, queue: queue, completionHandler:{ (response: NSURLResponse?, data: NSData?, error: NSError?) -> Void in          do {             if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {                 print("ASynchronous\(jsonResult)")             }         } catch let error as NSError {             print(error.localizedDescription)         }       }) 

3. As usual URL connection

Swift 1.2

    var dataVal = NSMutableData()     let urlPath: String = "YOUR URL HERE"     var url: NSURL = NSURL(string: urlPath)!     var request: NSURLRequest = NSURLRequest(URL: url)     var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: true)!     connection.start() 

Then

 func connection(connection: NSURLConnection!, didReceiveData data: NSData!){     self.dataVal?.appendData(data) }   func connectionDidFinishLoading(connection: NSURLConnection!) {     var error: NSErrorPointer=nil      var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(dataVal!, options: NSJSONReadingOptions.MutableContainers, error: error) as NSDictionary      println(jsonResult)    } 

Swift 2.0 +

   var dataVal = NSMutableData()     let urlPath: String = "YOUR URL HERE"     var url: NSURL = NSURL(string: urlPath)!     var request: NSURLRequest = NSURLRequest(URL: url)     var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: true)!     connection.start() 

Then

func connection(connection: NSURLConnection!, didReceiveData data: NSData!){     dataVal.appendData(data) }   func connectionDidFinishLoading(connection: NSURLConnection!) {      do {         if let jsonResult = try NSJSONSerialization.JSONObjectWithData(dataVal, options: []) as? NSDictionary {             print(jsonResult)         }     } catch let error as NSError {         print(error.localizedDescription)     }  } 

4. Asynchronous POST Request

Swift 1.2

    let urlPath: String = "YOUR URL HERE"     var url: NSURL = NSURL(string: urlPath)!     var request1: NSMutableURLRequest = NSMutableURLRequest(URL: url)      request1.HTTPMethod = "POST"      var stringPost="deviceToken=123456" // Key and Value      let data = stringPost.dataUsingEncoding(NSUTF8StringEncoding)      request1.timeoutInterval = 60     request1.HTTPBody=data     request1.HTTPShouldHandleCookies=false      let queue:NSOperationQueue = NSOperationQueue()       NSURLConnection.sendAsynchronousRequest(request1, queue: queue, completionHandler:{ (response: NSURLResponse!, data: NSData!, error: NSError!) -> Void in           var err: NSError          var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary         println("AsSynchronous\(jsonResult)")           }) 

Swift 2.0 +

let urlPath: String = "YOUR URL HERE"     let url: NSURL = NSURL(string: urlPath)!     let request1: NSMutableURLRequest = NSMutableURLRequest(URL: url)      request1.HTTPMethod = "POST"     let stringPost="deviceToken=123456" // Key and Value      let data = stringPost.dataUsingEncoding(NSUTF8StringEncoding)      request1.timeoutInterval = 60     request1.HTTPBody=data     request1.HTTPShouldHandleCookies=false      let queue:NSOperationQueue = NSOperationQueue()      NSURLConnection.sendAsynchronousRequest(request1, queue: queue, completionHandler:{ (response: NSURLResponse?, data: NSData?, error: NSError?) -> Void in          do {             if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {                 print("ASynchronous\(jsonResult)")             }         } catch let error as NSError {             print(error.localizedDescription)         }       }) 

5. Asynchronous GET Request

Swift 1.2

    let urlPath: String = "YOUR URL HERE"     var url: NSURL = NSURL(string: urlPath)!     var request1: NSMutableURLRequest = NSMutableURLRequest(URL: url)      request1.HTTPMethod = "GET"     request1.timeoutInterval = 60     let queue:NSOperationQueue = NSOperationQueue()       NSURLConnection.sendAsynchronousRequest(request1, queue: queue, completionHandler:{ (response: NSURLResponse!, data: NSData!, error: NSError!) -> Void in           var err: NSError          var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary         println("AsSynchronous\(jsonResult)")           }) 

Swift 2.0 +

let urlPath: String = "YOUR URL HERE"     let url: NSURL = NSURL(string: urlPath)!     let request1: NSMutableURLRequest = NSMutableURLRequest(URL: url)      request1.HTTPMethod = "GET"     let queue:NSOperationQueue = NSOperationQueue()      NSURLConnection.sendAsynchronousRequest(request1, queue: queue, completionHandler:{ (response: NSURLResponse?, data: NSData?, error: NSError?) -> Void in          do {             if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {                 print("ASynchronous\(jsonResult)")             }         } catch let error as NSError {             print(error.localizedDescription)         }       }) 

6. Image(File) Upload

Swift 2.0 +

  let mainURL = "YOUR_URL_HERE"      let url = NSURL(string: mainURL)     let request = NSMutableURLRequest(URL: url!)     let boundary = "78876565564454554547676"     request.addValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")       request.HTTPMethod = "POST" // POST OR PUT What you want     let session = NSURLSession(configuration:NSURLSessionConfiguration.defaultSessionConfiguration(), delegate: nil, delegateQueue: nil)      let imageData = UIImageJPEGRepresentation(UIImage(named: "Test.jpeg")!, 1)          var body = NSMutableData()      body.appendData("--\(boundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)      // Append your parameters      body.appendData("Content-Disposition: form-data; name=\"name\"\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)     body.appendData("PREMKUMAR\r\n".dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)!)     body.appendData("--\(boundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)      body.appendData("Content-Disposition: form-data; name=\"description\"\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)     body.appendData("IOS_DEVELOPER\r\n".dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)!)     body.appendData("--\(boundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)       // Append your Image/File Data      var imageNameval = "HELLO.jpg"      body.appendData("--\(boundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)     body.appendData("Content-Disposition: form-data; name=\"profile_photo\"; filename=\"\(imageNameval)\"\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)     body.appendData("Content-Type: image/jpeg\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)     body.appendData(imageData!)     body.appendData("\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)      body.appendData("--\(boundary)--\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)      request.HTTPBody = body         let dataTask = session.dataTaskWithRequest(request) { (data, response, error) -> Void in          if error != nil {              //handle error           }         else {                 let outputString : NSString = NSString(data:data!, encoding:NSUTF8StringEncoding)!             print("Response:\(outputString)")           }     }     dataTask.resume() 

7. GET,POST,Etc Swift 3.0 +

let request = NSMutableURLRequest(url: URL(string: "YOUR_URL_HERE" ,param: param))!,     cachePolicy: .useProtocolCachePolicy,     timeoutInterval:60) request.httpMethod = "POST" // POST ,GET, PUT What you want   let session = URLSession.shared      let dataTask = session.dataTask(with: request as URLRequest) {data,response,error in  do {             if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {                 print("ASynchronous\(jsonResult)")             }         } catch let error as NSError {             print(error.localizedDescription)         }      }     dataTask.resume()