使用iOS Swift的NSURLConnection

Question

我正在尝试按照本教程并使用Swift和来连接到JSON api NSURLConnection。我可以看到它正在击中url，但connectionDidFinishLoading似乎没有触发。import UIKitclass 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 codevar remote = Remote()remote.connect("/apis")此时，我只是想查看返回的数据。我确定一旦可以正常运行，便想将其挂接到视图控制器中。这样做是否有问题，并导致问题？

Answer 1

检查以下代码：

1. SynchronousRequest

斯威夫特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)")

迅捷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

斯威夫特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)")

       })

迅捷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.照常URL连接

斯威夫特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()

然后

 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)

}

迅捷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()

然后

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.异步POST请求

斯威夫特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)")

        })

迅捷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.异步GET请求

斯威夫特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)")

        })

迅捷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.图片（文件）上传

迅捷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及更高版本

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()